Tuesday, 01 April 2025 01:03
Add, Replace or Remove Images in PDF with JavaScript in React
PDFs are versatile documents that often contain images to enhance their visual appeal and convey information. The ability to manipulate these images - adding new ones, replacing existing ones, or removing unwanted ones - is a valuable skill. In this article, you will learn how to add, replace, or delete images in a PDF document in React using Spire.PDF for JavaScript .
- Add an Image to a PDF Document in JavaScript
- Replace an Image in a PDF Document in JavaScript
- Remove an Image from a PDF Document in JavaScript
Install Spire.PDF for JavaScript
To get started with manipulating images in PDF in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
Add an Image to a PDF Document in JavaScript
Spire.PDF for JavaScript provides the PdfPage.Canvas.DrawImage() method to add an image at a specified location on a PDF page. The main steps are as follows.
- Load the input image into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Add a page to the PDF document using the PdfDocument.Pages.Add() method.
- Load the image using the wasmModule.PdfImage.FromFile() method.
- Specify the size of the image.
- Draw the image at a specified location on the page using the PdfPageBase.Canvas.DrawImage() method.
- Save the PDF document using PdfDocument.SaveToFile() method.
- Trigger the download of the resulting document.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to add images in PDF
const AddPdfImage = async () => {
if (wasmModule) {
// Specify the input and output file paths
const inputFileName = "JS.png";
const outputFileName = "DrawImage.pdf";
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName , '', `${process.env.PUBLIC_URL}/`);
// Create a pdf instance
let pdf = wasmModule.PdfDocument.Create();
// Add a page
let page = pdf.Pages.Add();
// Load the image
let image = wasmModule.PdfImage.FromFile(inputFileName);
// Calculate the scaled width and height of the image
let width = image.Width * 0.6;
let height = image.Height * 0.6;
// Calculate the x-coordinate to center the image horizontally on the page
let x = (page.Canvas.ClientSize.Width - width) / 2;
// Draw the image at a specified location on the page
page.Canvas.DrawImage({image:image, x:x, y: 60, width: width, height: height});
// Save the result file
pdf.SaveToFile({fileName: outputFileName});
// Clean up resources
pdf.Close();
// Read the generated PDF file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the PDF file
const modifiedFile = new Blob([modifiedFileArray], { type: "application/pdf" });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Add Images in PDF with JavaScript in React</h1>
<button onClick={AddPdfImage} disabled={!wasmModule}>
Process
</button>
</div>
);
}
export default App;
Run the code to launch the React app at localhost:3000. Once it's running, click the "Process" button to insert image in PDF:
Below is the result file:
Replace an Image in a PDF Document in JavaScript
To replace an image in PDF, you can load a new image and then replace the existing image with the new one through the PdfImageHelper.ReplaceImage() method. The main steps are as follows.
- Load the input file and image into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load a PDF document using the PdfDocument.LoadFromFile() method.
- Get a specific page through the PdfDocument.Pages.get_Item() method.
- Load an image using PdfImage.FromFile() method.
- Create a PdfImageHelper object with the wasmModule.PdfImageHelper.Create() method.
- Get the image information on the page using the PdfImageHelper.GetImagesInfo() method.
- Load the input image using the wasmModule.PdfImage.FromFile() method.
- Replace an existing image in the page with the new image using the PdfImageHelper.ReplaceImage() method.
- Save the PDF document using PdfDocument.SaveToFile() method.
- Trigger the download of the resulting document.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to replace an image in PDF
const ReplacePdfImage = async () => {
if (wasmModule) {
// Specify the input and output file paths
const inputFileName = "DrawImage.pdf";
const inputImageName = "coding1.jpg";
const outputFileName = "ReplaceImage.pdf";
// Fetch the input file and image and add them to the VFS
await wasmModule.FetchFileToVFS(inputFileName , '', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS(inputImageName , '', `${process.env.PUBLIC_URL}/`);
// Create a pdf instance
let pdf = wasmModule.PdfDocument.Create();
// Load the PDF file
pdf.LoadFromFile({fileName: inputFileName});
// Get the first page
let page = pdf.Pages.get_Item(0);
// Create a PdfImageHelper instance
let helper = wasmModule.PdfImageHelper.Create();
// Get the image information from the page
let images = helper.GetImagesInfo(page);
// Load a new image
let newImage = wasmModule.PdfImage.FromFile(inputImageName);
// Replace the first image on the page with the loaded image
helper.ReplaceImage(images[0], newImage);
// Save the result file
pdf.SaveToFile({fileName: outputFileName});
// Clean up resources
pdf.Close();
// Read the generated PDF file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the PDF file
const modifiedFile = new Blob([modifiedFileArray], { type: "application/pdf" });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Replace an Image in PDF with JavaScript in React</h1>
<button onClick={ReplacePdfImage} disabled={!wasmModule}>
Process
</button>
</div>
);
}
export default App;
Remove an Image from a PDF Document in JavaScript
The PdfImageHelper class also provides the DeleteImage() method to remove a specific image from a PDF page. The main steps are as follows.
- Load the input file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load a PDF document using the PdfDocument.LoadFromFile() method.
- Get a specific page using the PdfDocument.Pages.get_Item() method.
- Create a PdfImageHelper object with the wasmModule.PdfImageHelper.Create() method.
- Get the image information on the page using the PdfImageHelper.GetImagesInfo() method.
- Delete a specified image on the page using the PdfImageHelper.DeleteImage() method.
- Save the PDF document using PdfDocument.SaveToFile() method.
- Trigger the download of the resulting document.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to remove images in PDF
const DeletePdfImage = async () => {
if (wasmModule) {
// Specify the input and output file paths
const inputFileName = "DrawImage.pdf";
const outputFileName = "DeleteImage.pdf";
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName , '', `${process.env.PUBLIC_URL}/`);
// Create a pdf instance
let pdf = wasmModule.PdfDocument.Create();
// Load the PDF file
pdf.LoadFromFile({fileName: inputFileName});
// Get the first page
let page = pdf.Pages.get_Item(0);
// Create a PdfImageHelper instance
let helper = wasmModule.PdfImageHelper.Create();
// Get the image information from the page
let images = helper.GetImagesInfo(page);
// Delete the first image on the page
helper.DeleteImage({imageInfo: images[0]});
// Save the result file
pdf.SaveToFile({fileName: outputFileName});
// Clean up resources
pdf.Close();
// Read the generated PDF file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the PDF file
const modifiedFile = new Blob([modifiedFileArray], { type: "application/pdf" });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Remove an Image from PDF with JavaScript in React</h1>
<button onClick={DeletePdfImage} disabled={!wasmModule}>
Process
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Image
Friday, 21 March 2025 01:03
Convert PDF to HTML with JavaScript in React
Converting PDF to HTML is important for improving accessibility and interactivity in web environments. While PDFs are widely used for their reliable layout and ease of sharing, they can be restrictive when it comes to online use. HTML provides greater flexibility, allowing content to be displayed more effectively on websites and mobile devices. By converting a PDF document into HTML, developers can enhance search engine visibility, enable easier editing, and create more user-friendly experiences. In this article, we will demonstrate how to convert PDF to HTML in React with JavaScript and the Spire.PDF for JavaScript library.
- Convert PDF to HTML in React
- Customize PDF to HTML Conversion Settings in React
- Convert PDF to HTML Stream in React
Install Spire.PDF for JavaScript
To get started with converting PDF to HTML with JavaScript in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project. Additionally, include the required font files to ensure accurate and consistent text rendering.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
Convert PDF to HTML in React
The PdfDocument.SaveToFile() method offered by Spire.PDF for JavaScript allows developers to effortlessly convert a PDF file into HTML format. The detailed steps are as follows.
- Load the required font file and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF file using the PdfDocument.LoadFromFile() method.
- Save the PDF file to HTML format using the PdfDocument.SaveToFile() method.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to HTML
const ConvertPdfToHTML = async () => {
if (wasmModule) {
// Load the necessary font file into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('ARIAL.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'Input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Define the output file name
const outputFileName = 'PdfToHtml.html';
// Save the document to an HTML file
doc.SaveToFile({fileName: outputFileName, fileFormat: wasmModule.FileFormat.HTML});
// Clean up resources
doc.Close();
doc.Dispose();
// Read the saved file and convert it to a Blob object
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
const modifiedFile = new Blob([modifiedFileArray], { type: 'text/html' });
// Create a URL for the Blob and initiate the download
const url = URL.createObjectURL(modifiedFile);
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to HTML in React Using JavaScript</h1>
<button onClick={ConvertPdfToHTML} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Run the code to launch the React app at localhost:3000. Once it's running, click on the "Convert" button to convert the PDF file to HTML format:
Here is the screenshot of the input PDF file and the converted HTML file:
Customize PDF to HTML Conversion Settings in React
Developers can use the PdfDocument.ConvertOptions.SetPdfToHtmlOptions() method to customize settings during the PDF to HTML conversion process. For instance, they can choose whether to embed SVG or images in the resulting HTML and set the maximum number of pages included in each HTML file. The detailed steps are as follows.
- Load the required font file and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF file using the PdfDocument.LoadFromFile() method.
- Customize the PDF to HTML conversion settings using the PdfDocument.ConvertOptions.SetPdfToHtmlOptions() method.
- Save the PDF document to HTML format using the PdfDocument.SaveToFile() method.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to HTML
const ConvertPdfToHTML = async () => {
if (wasmModule) {
// Load the necessary font file into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('ARIAL.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'Input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Customize the conversion settings
// Parameters: useEmbeddedSvg: false, useEmbeddedImg: true, maxPageOneFile: 1
doc.ConvertOptions.SetPdfToHtmlOptions(false, true, 1);
// Define the output file name
const outputFileName = 'CutomizePdfToHtmlConversion.html';
// Save the document to an HTML file
doc.SaveToFile({fileName: outputFileName, fileFormat: wasmModule.FileFormat.HTML});
// Clean up resources
doc.Close();
doc.Dispose();
// Read the saved file and convert it to a Blob object
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
const modifiedFile = new Blob([modifiedFileArray], { type: 'text/html' });
// Create a URL for the Blob and initiate the download
const url = URL.createObjectURL(modifiedFile);
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to HTML in React Using JavaScript</h1>
<button onClick={ConvertPdfToHTML} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Convert PDF to HTML Stream in React
Spire.PDF for JavaScript also supports converting a PDF to an HTML stream using the PdfDocument.SaveToStream() method. The detailed steps are as follows.
- Load the required font file and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF file using the PdfDocument.LoadFromFile() method.
- Create a memory stream using the wasmModule.Stream.CreateByFile() method.
- Save the PDF document as an HTML stream using the PdfDocument.SaveToStream() method.
- Write the content of the stream to an HTML file using the wasmModule.FS.writeFile() method.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to HTML
const ConvertPdfToHTML = async () => {
if (wasmModule) {
// Load the necessary font file into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('ARIAL.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'Input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Define the output file name
const outputFileName = 'PdfToHtmlStream.html';
// Create a new memory stream
let ms = wasmModule.Stream.CreateByFile(outputFileName);
// Save the PDF document to an HTML stream
doc.SaveToStream({stream: ms, fileformat: wasmModule.FileFormat.HTML});
// Write the content of the memory stream to an HTML file
wasmModule.FS.writeFile(outputFileName, ms.ToArray());
// Clean up resources
doc.Close();
doc.Dispose();
// Read the saved file and convert it to a Blob object
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
const modifiedFile = new Blob([modifiedFileArray], { type: 'text/html' });
// Create a URL for the Blob and initiate the download
const url = URL.createObjectURL(modifiedFile);
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to HTML in React Using JavaScript</h1>
<button onClick={ConvertPdfToHTML} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Conversion
Thursday, 20 March 2025 01:09
Convert PDF to Word with JavaScript in React
Converting PDF files to Word documents is essential for modern web applications focused on document management and editing. Using JavaScript and React, developers can easily integrate this functionality with libraries like Spire.PDF for JavaScript. This guide will walk you through implementing a PDF-to-Word conversion feature in a React application, showing how to load files, configure settings, and enable users to download their converted documents effortlessly.
Install Spire.PDF for JavaScript
To get started with converting PDF to Word with JavaScript in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project. Additionally, include the required font files to ensure accurate and consistent text rendering.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
Convert PDF to Word Using PdfToDocConverter Class
The PdfToDocConverter class from Spire.PDF for JavaScript facilitates the conversion of PDF files to Word documents. It includes the DocxOptions property, allowing developers to customize conversion settings, including document properties. The conversion is performed using the SaveToDocx() method.
Steps to convert PDF to Word using the PdfToDocConverter class in React:
- Load the necessary font files and input PDF file into the virtual file system (VFS).
- Instantiate a PdfToDocConverter object using the wasmModule.PdfToDocConverter.Create() method, passing the PDF file path.
- Customize the generated Word file's properties using the DocxOptions property.
- Use the SaveToDocx() method to convert the PDF document.
- Trigger the download of the resulting Word file.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to Word
const ConvertPdfToWord = async () => {
if (wasmModule) {
// Load the necessary font files into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('GOTHIC.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICB.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICBI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a PdfToDocConverter object
let converter = wasmModule.PdfToDocConverter.Create({filePath: inputFileName});
// Set document properties of the generated Word file
converter.DocxOptions.Subject = "Convert PDF to Word";
converter.DocxOptions.Authors = "E-ICEBLUE"
// Define the output file name
const outputFileName = "ToWord.docx";
// Convert PDF as a Docx file
converter.SaveToDocx({fileName: outputFileName});
// Read the generated Word file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the Word file
const modifiedFile = new Blob([modifiedFileArray], {type:'msword'});
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to Word in React</h1>
<button onClick={ConvertPdfToWord} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Run the code to launch the React app at localhost:3000. Click "Convert," and a "Save As" window will appear, prompting you to save the output file in your chosen folder.
Below is a screenshot showing the input PDF file and the output Word file:
Convert PDF to Word Using PdfDocument Class
To convert PDF to Word, you can also use the PdfDocument class. This class allows developers to load an existing PDF document, make modifications, and save it as a Word file. This feature is particularly useful for users who need to edit or enhance their PDFs before conversion.
Steps to convert PDF to Word Using the PdfDocument class in React:
- Load the necessary font files and input PDF file into the virtual file system (VFS).
- Create a PdfDocument object using the wasmModule.PdfDocument.Create() method
- Load the PDF document using the PdfDocument.LoadFromFile() method.
- Convert the PDF document to a Word file using the PdfDocument.SaveToFile() method.
- Trigger the download of the resulting Word file.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to Word
const ConvertPdfToWord = async () => {
if (wasmModule) {
// Load the necessary font files into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('GOTHIC.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICB.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICBI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a PdfDocument object
let doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Define the output file name
const outputFileName = "ToWord.docx";
// Convert PDF as a Docx file
doc.SaveToFile({fileName: outputFileName,fileFormat: wasmModule.FileFormat.DOCX});
// Read the generated Word file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the Word file
const modifiedFile = new Blob([modifiedFileArray], {type:'msword'});
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
// Cleanup resources
doc.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to Word in React</h1>
<button onClick={ConvertPdfToWord} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Conversion
Friday, 14 March 2025 01:06
Convert PDF to Excel Using JavaScript in React
In data-driven workflows, converting PDF documents with tables to Excel improves accessibility and usability. While PDFs preserve document integrity, their static nature makes data extraction challenging, often leading to error-prone manual work. By leveraging JavaScript in React, developers can automate the conversion process, seamlessly transferring structured data like financial reports into Excel worksheets for real-time analysis and collaboration. This article explores how to use Spire.PDF for JavaScript to efficiently convert PDFs to Excel files with JavaScript in React applications.
- Steps to Convert PDF to Excel Using JavaScript
- Simple PDF to Excel Conversion in JavaScript
- Convert PDF to Excel with XlsxLineLayoutOptions
- Convert PDF to Excel with XlsxTextLayoutOptions
Install Spire.PDF for JavaScript
To get started with converting PDF to Excel with JavaScript in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project. Additionally, make sure to include the required font files to ensure accurate and consistent text rendering.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
Steps to Convert PDF to Excel Using JavaScript
With the Spire.PDF for JavaScript WebAssembly module, PDF documents can be loaded from the Virtual File System (VFS) using the PdfDocument.LoadFromFile() method and converted into Excel workbooks using the PdfDocument.SaveToFile() method.
In addition to direct conversion, developers can customize the process by configuring conversion options through the XlsxLineLayoutOptions and XlsxTextLayoutOptions classes, along with the PdfDocument.ConvertOptions.SetPdfToXlsxOptions() method.
The following steps demonstrate how to convert a PDF document to an Excel file using Spire.PDF for JavaScript:
- Load the Spire.Pdf.Base.js file to initialize the WebAssembly module.
- Fetch the PDF file into the Virtual File System (VFS) using the wasmModule.FetchFileToVFS() method.
- Fetch the font files used in the PDF document to the “/Library/Fonts/” folder in the VFS using the wasmModule.FetchFileToVFS() method.
- Create an instance of the PdfDocument class using the wasmModule.PdfDocument.Create() method.
- Load the PDF document from the VFS into the PdfDocument instance using the PdfDocument.LoadFromFile() method.
- (Optional) Customize the conversion options:
- Create an instance of the XlsxLineLayoutOptions or XlsxTextLayoutOptions class and specify the desired conversion settings.
- Apply the conversion options using the PdfDocument.ConvertOptions.SetPdfToXlsxOptions() method.
- Convert the PDF document to an Excel file using the PdfDocument.SaveToFile({ filename: string, wasmModule.FileFormat.XLSX }) method.
- Retrieve the converted file from the VFS for download or further use.
Simple PDF to Excel Conversion in JavaScript
Developers can directly load a PDF document from the VFS and convert it to an Excel file using the default conversion settings. These settings map one PDF page to one Excel worksheet, preserve rotated and overlapped text, allow cell splitting, and enable text wrapping.
Below is a code example demonstrating this process:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to Excel
const ConvertPDFToExcel = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFToExcel.xlsx';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Fetch the font file used in the PDF to the VFS
await wasmModule.FetchFileToVFS('Calibri.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('Symbol.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Convert the PDF document to an Excel file
pdf.SaveToFile({ fileName: outputFileName, fileFormat: wasmModule.FileFormat.XLSX});
// Read the Excel file from the VFS
const excelArray = await wasmModule.FS.readFile(outputFileName)
// Create a Blob object from the Excel file and trigger a download
const blob = new Blob([excelArray], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to Excel Using JavaScript in React</h1>
<button onClick={ConvertPDFToExcel} disabled={!wasmModule}>
Convert and Download
</button>
</div>
);
}
export default App;
Convert PDF to Excel with XlsxLineLayoutOptions
Spire.PDF for JavaScript provides the XlsxLineLayoutOptions class for configuring line-based conversion settings when converting PDFs to Excel. By adjusting these options, developers can achieve different conversion results, such as merging all PDF pages into a single worksheet.
The table below outlines the available parameters in XlsxLineLayoutOptions:
| Parameter (bool) | Function |
| convertToMultipleSheet | Specifies whether to convert each page into a separate worksheet. |
| rotatedText | Specifies whether to retain rotated text. |
| splitCell | Specifies whether to split cells. |
| wrapText | Specifies whether to wrap text within cells. |
| overlapText | Specifies whether to retain overlapped text. |
Special attention should be given to the splitCell parameter, as it significantly impacts the way tables are converted. Setting it to false preserves table cell structures, making the output table cells more faithful to the original PDF. Conversely, setting it to true allows plain text to be split smoothly in cells, which may be useful for text-based layouts rather than structured tables.
Below is a code example demonstrating PDF-to-Excel conversion using XlsxLineLayoutOptions:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to Excel with XlsxLineLayoutOptions
const ConvertPDFToExcelXlsxLineLayoutOptions = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFToExcelXlsxLineLayoutOptions.xlsx';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Fetch the font file used in the PDF to the VFS
await wasmModule.FetchFileToVFS('Calibri.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('Symbol.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create an instance of the XlsxLineLayoutOptions class and specify the conversion options
const options = wasmModule.XlsxLineLayoutOptions.Create({ convertToMultipleSheet: true, rotatedText: false, splitCell: false, wrapText: false, overlapText: true});
// Set the XlsxLineLayoutOptions instance as the conversion options
pdf.ConvertOptions.SetPdfToXlsxOptions(options);
// Convert the PDF document to an Excel file
pdf.SaveToFile({ fileName: outputFileName, fileFormat: wasmModule.FileFormat.XLSX});
// Read the Excel file from the VFS
const excelArray = await wasmModule.FS.readFile(outputFileName)
// Create a Blob object from the Excel file and trigger a download
const blob = new Blob([excelArray], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to Excel with XlsxLineLayoutOptions Using JavaScript in React</h1>
<button onClick={ConvertPDFToExcelXlsxLineLayoutOptions} disabled={!wasmModule}>
Convert and Download
</button>
</div>
);
}
export default App;
Convert PDF to Excel Using XlsxTextLayoutOptions
Developers can also customize conversion settings using the XlsxTextLayoutOptions class, which focuses on text-based layout formatting. The table below lists its parameters:
| Parameter (bool) | Function |
| convertToMultipleSheet | Specifies whether to convert each page into a separate worksheet. |
| rotatedText | Specifies whether to retain rotated text. |
| overlapText | Specifies whether to retain overlapped text. |
Below is a code example demonstrating PDF-to-Excel conversion using XlsxTextLayoutOptions:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to Excel with XlsxTextLayoutOptions
const ConvertPDFToExcelXlsxTextLayoutOptions = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFToExcelXlsxTextLayoutOptions.xlsx';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Fetch the font file used in the PDF to the VFS
await wasmModule.FetchFileToVFS('Calibri.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('Symbol.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create an instance of the XlsxTextLayoutOptions class and specify the conversion options
const options = wasmModule.XlsxTextLayoutOptions.Create({ convertToMultipleSheet: false, rotatedText: true, overlapText: true});
// Set the XlsxTextLayoutOptions instance as the conversion options
pdf.ConvertOptions.SetPdfToXlsxOptions(options);
// Convert the PDF document to an Excel file
pdf.SaveToFile({ fileName: outputFileName, fileFormat: wasmModule.FileFormat.XLSX});
// Read the Excel file from the VFS
const excelArray = await wasmModule.FS.readFile(outputFileName)
// Create a Blob object from the Excel file and trigger a download
const blob = new Blob([excelArray], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to Excel with XlsxTextLayoutOptions Using JavaScript in React</h1>
<button onClick={ConvertPDFToExcelXlsxTextLayoutOptions} disabled={!wasmModule}>
Convert and Download
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Conversion
Thursday, 13 March 2025 00:47
Convert PDF to Images with JavaScript in React
Transforming PDF documents into image formats like JPG or PNG is a powerful way to enhance the accessibility and usability of your content. By converting PDF pages into images, you preserve the original layout and design, making it ideal for various applications, from online sharing to incorporation in websites and presentations.
In this article, you will learn how to convert PDF files to images in React using Spire.PDF for JavaScript. We will guide you through the process step-by-step, ensuring you can easily generate high-quality images from your PDF documents.
Install Spire.PDF for JavaScript
To get started with converting PDF to images with JavaScript in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project. Additionally, include the required font files to ensure accurate and consistent text rendering.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
Convert PDF to JPG in React
Spire.PDF for JavaScript provides the PdfDocument.SaveAsImage() method to convert a specific page of a PDF into image byte data, which can then be saved as a JPG file using the Save() method. To convert all pages into individual images, iterate through each page.
The following are the steps to convert PDF to JPG in React:
- Load the required font files and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF using the PdfDocument.LoadFromFile() method.
- Iterate through the document's pages:
- Convert each page into image byte data using the PdfDocument.SaveAsImage() method.
- Save the image as a JPG file using the Save() method.
- Trigger the download of the generated JPG file.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to JPG
const ConvertPdfToJpg = async () => {
if (wasmModule) {
// Load the necessary font files into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('GOTHIC.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICB.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICBI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Iterate through the pages in the document
for (let i = 0; i < doc.Pages.Count; i++) {
// Specify the output file name
let outputFileName = `ToImage-img-${i}.jpg`;
// Save the specific page to image data
let imageData = doc.SaveAsImage({pageIndex: i});
// Save the image data as a JPG file
imageData.Save(outputFileName);
// Read the generated JPG file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the JPG file
const modifiedFile = new Blob([modifiedFileArray], { type:'image/jpeg' });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
// Clean up resources
doc.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to JPG in React</h1>
<button onClick={ConvertPdfToJpg} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Run the code to launch the React app at localhost:3000. Click "Convert," and a "Save As" window will appear, prompting you to save the output file in your chosen folder.
Here is a screenshot of the generated JPG files:
Convert PDF to PNG in React
To convert a PDF document into individual PNG files, iterate through its pages and use the PdfDocument.SaveAsImage() method to generate image byte data for each page. Then, save these byte data as PNG files.
The following are the steps to convert PDF to PNG in React:
- Load the required font files and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF using the PdfDocument.LoadFromFile() method.
- Iterate through the document's pages:
- Convert each page into image byte data using the PdfDocument.SaveAsImage() method.
- Save the image as a PNG file using the Save() method.
- Trigger the download of the generated PNG file.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to PNG
const ConvertPdfToPng = async () => {
if (wasmModule) {
// Load the necessary font files into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('GOTHIC.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICB.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICBI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Make background of the generated images transparent
// doc.ConvertOptions.SetPdfToImageOptions(0);
// Iterate through the pages in the document
for (let i = 0; i < doc.Pages.Count; i++) {
// Specify the output file name
let outputFileName = `ToImage-img-${i}.png`;
// Save the specific page to image data
let imageData = doc.SaveAsImage({pageIndex: i});
// Save the image data as a PNG file
imageData.Save(outputFileName);
// Read the generated PNG file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the PNG file
const modifiedFile = new Blob([modifiedFileArray], { type:'image/png' });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
// Clean up resources
doc.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to PNG in React</h1>
<button onClick={ConvertPdfToPng} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Convert PDF to SVG in React
To convert each page of a PDF document into individual SVG files, you can utilize the PdfDocument.SaveToFile() method. Here are the detailed steps:
- Load the required font files and the input PDF file into the Virtual File System (VFS).
- Create a PdfDocument object with the wasmModule.PdfDocument.Create() method.
- Load the PDF using the PdfDocument.LoadFromFile() method.
- Iterate through the pages:
- Convert each page into an SVG file using the PdfDocument.SaveToFile() method.
- Trigger the download of the generated SVG file.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to hold the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during loading
console.error('Failed to load WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to convert PDF to SVG
const ConvertPdfToSvg = async () => {
if (wasmModule) {
// Load the necessary font files into the virtual file system (VFS)
await wasmModule.FetchFileToVFS('GOTHIC.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICB.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICBI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
await wasmModule.FetchFileToVFS('GOTHICI.TTF', '/Library/Fonts/', `${process.env.PUBLIC_URL}/`);
// Load the input PDF file into the VFS
let inputFileName = 'input.pdf';
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create a new document
const doc = wasmModule.PdfDocument.Create();
// Load the PDF file
doc.LoadFromFile(inputFileName);
// Iterate through the pages in the document
for (let i = 0; i < doc.Pages.Count; i++) {
// Specify the output file name
let outputFileName = `ToSVG_${i}.svg`;
// Save a specfic page to SVG
doc.SaveToFile({fileName: outputFileName, startIndex:i, endIndex:i, fileFormat: wasmModule.FileFormat.SVG});
// Read the generated SVG file
const modifiedFileArray = wasmModule.FS.readFile(outputFileName);
// Create a Blob object from the SVG file
const modifiedFile = new Blob([modifiedFileArray], { type:'image/svg+xml' });
// Create a URL for the Blob
const url = URL.createObjectURL(modifiedFile);
// Create an anchor element to trigger the download
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
// Clean up resources
doc.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Convert PDF to SVG in React</h1>
<button onClick={ConvertPdfToSvg} disabled={!wasmModule}>
Convert
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Conversion
Friday, 07 March 2025 06:52
Extract Text from PDF Documents with JavaScript in React
Extracting text from PDF documents directly within a React application using JavaScript provides a streamlined, self-contained solution for handling dynamic content. Given that PDFs remain a ubiquitous format for reports, forms, and data sharing, parsing their contents on the client side enables developers to build efficient applications without relying on external services. By integrating Spire.PDF for JavaScript into React, development teams gain full control over data processing, reduce latency by eliminating server-side dependencies, and deliver real-time user experiences—all while ensuring that sensitive information remains secure within the browser.
In this article, we explore how to use Spire.PDF for JavaScript to extract text from PDF documents in React applications, simplifying the integration of robust PDF content extraction features.
- General Steps for Extracting PDF Text Using JavaScript
- Extract PDF Text with Layout Preservation
- Extract PDF Text without Layout Preservation
- Extract PDF Text from Specific Page Areas
- Extract Highlighted Text from PDF
Install Spire.PDF for JavaScript
To get started with extracting text from PDF documents with JavaScript in a React application, you can either download Spire.PDF for JavaScript from our website or install it via npm with the following command:
npm i spire.pdf
After that, copy the "Spire.Pdf.Base.js" and "Spire.Pdf.Base.wasm" files to the public folder of your project.
For more details, refer to the documentation: How to Integrate Spire.PDF for JavaScript in a React Project
General Steps for Extracting PDF Text Using JavaScript
Spire.PDF for JavaScript provides a WebAssembly module that enables PDF document processing using simple JavaScript code in React applications. Developers can utilize the PdfTextExtractor class to handle text extraction tasks efficiently. The general steps for extracting text from PDF documents using Spire.PDF for JavaScript in React are as follows:
- Load the Spire.Pdf.Base.js file to initialize the WebAssembly module.
- Fetch the PDF files into the Virtual File System (VFS) using the wasmModule.FetchFileToVFS() method.
- Create an instance of the PdfDocument class using the wasmModule.PdfDocument.Create() method.
- Load the PDF document from the VFS into the PdfDocument instance using the PdfDocument.LoadFromFile() method.
- Create an instance of the PdfTextExtractOptions class using the wasmModule.PdfTextExtractOptions.Create() method and configure the text extraction options.
- Retrieve a PDF page using the PdfDocument.Pages.get_Item() method or iterate through the document's pages.
- Create an instance of the PdfTextExtractor class with the page object using the wasmModule.PdfTextExtractor.Create() method.
- Extract text from the page using the PdfTextExtractor.ExtractText() method.
- Download the extracted text or process it as needed.
The PdfTextExtractOptions class allows customization of extraction settings, supporting features such as simple extraction, extracting specific page areas, and retrieving hidden text. The following table outlines the properties of the PdfTextExtractOptions class and their functions:
| Property | Description |
| IsSimpleExtraction | Specifies whether to perform simple text extraction. |
| IsExtractAllText | Specifies whether to extract all text. |
| ExtractArea | Defines the extraction area. |
| IsShowHiddenText | Specifies whether to extract hidden text. |
Extract PDF Text with Layout Preservation
Using the PdfTextExtractor.ExtractText() method with default options enables text extraction while preserving the original text layout of the PDF pages. Below is a code example and the corresponding extraction result:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to extract all text from a PDF document
const ExtractPDFText = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFTextWithLayout.txt';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create a string object to store the extracted text
let text = '';
// Create an instance of the PdfTextExtractOptions class
const extractOptions = wasmModule.PdfTextExtractOptions.Create();
// Iterate through each page of the PDF document
for (let i = 0; i < pdf.Pages.Count; i++) {
// Get the current page
const page = pdf.Pages.get_Item(i);
// Create an instance of the PdfTextExtractor class
const textExtractor = wasmModule.PdfTextExtractor.Create(page);
// Extract the text from the current page and add it to the text string
text += textExtractor.ExtractText(extractOptions);
}
// Create a Blob object from the text string and download it
const blob = new Blob([text], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Extract Text from PDF Using JavaScript in React</h1>
<button onClick={ExtractPDFText} disabled={!wasmModule}>
Extract and Download
</button>
</div>
);
}
export default App;
Extract PDF Text without Layout Preservation
Setting the PdfTextExtractOptions.IsSimpleExtraction property to true enables a simple text extraction strategy, allowing text extraction from PDF pages without preserving the layout. In this approach, blank spaces are not retained. Instead, the program tracks the Y position of each text string and inserts line breaks whenever the Y position changes.
Below is a code example demonstrating text extraction without layout preservation using Spire.PDF for JavaScript, along with the extraction result:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to extract all text from a PDF document without layout preservation
const ExtractPDFText = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFTextWithoutLayout.txt';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create a string object to store the extracted text
let text = '';
// Create an instance of the PdfTextExtractOptions class
const extractOptions = wasmModule.PdfTextExtractOptions.Create();
// Enable simple text extraction to extract text without preserving layout
extractOptions.IsSimpleExtraction = true;
// Iterate through each page of the PDF document
for (let i = 0; i < pdf.Pages.Count; i++) {
// Get the current page
const page = pdf.Pages.get_Item(i);
// Create an instance of the PdfTextExtractor class
const textExtractor = wasmModule.PdfTextExtractor.Create(page);
// Extract the text from the current page and add it to the text string
text += textExtractor.ExtractText(extractOptions);
}
// Create a Blob object from the text string and download it
const blob = new Blob([text], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Extract Text from PDF Without Layout Preservation Using JavaScript in React</h1>
<button onClick={ExtractPDFText} disabled={!wasmModule}>
Extract and Download
</button>
</div>
);
}
export default App;
Extract PDF Text from Specific Page Areas
The PdfTextExtractOptions.ExtractArea property allows users to define a specific area using a RectangleF object to extract only the text within that area from a PDF page. This method helps exclude unwanted fixed content from the extraction process. The following code example and extraction result illustrate this functionality:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to extract text from a specific area of a PDF page
const ExtractPDFText = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFTextPageArea.txt';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create a string object to store the extracted text
let text = '';
// Get a page from the PDF document
const page = pdf.Pages.get_Item(0);
// Create an instance of the PdfTextExtractOptions class
const extractOptions = wasmModule.PdfTextExtractOptions.Create();
// Set the page area to extract text from using a RectangleF object
extractOptions.ExtractArea = wasmModule.RectangleF.Create({ x: 0, y: 500, width: page.Size.Width, height: 200});
// Create an instance of the PdfTextExtractor class
const textExtractor = wasmModule.PdfTextExtractor.Create(page);
// Extract the text from specified area of the page
text = textExtractor.ExtractText(extractOptions);
// Create a Blob object from the text string and download it
const blob = new Blob([text], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Extract Text from a PDF Page Area Using JavaScript in React</h1>
<button onClick={ExtractPDFText} disabled={!wasmModule}>
Extract and Download
</button>
</div>
);
}
export default App;
Extract Highlighted Text from PDF
Text highlighting in PDF documents is achieved using annotation features. With Spire.PDF for JavaScript, we can retrieve all annotations on a PDF page via the PdfPageBase.Annotations property. By checking whether each annotation is an instance of the PdfTextMarkupAnnotationWidget class, we can identify highlight annotations. Once identified, we can use the PdfTextExtractOptions.Bounds property to obtain the bounding rectangles of these annotations and set them as extraction areas, thereby extracting only the highlighted text.
The following code example demonstrates this process along with the extracted result:
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
// State to store the loaded WASM module
const [wasmModule, setWasmModule] = useState(null);
// useEffect hook to load the WASM module when the component mounts
useEffect(() => {
const loadWasm = async () => {
try {
// Access the Module and spirepdf from the global window object
const { Module, spirepdf } = window;
// Set the wasmModule state when the runtime is initialized
Module.onRuntimeInitialized = () => {
setWasmModule(spirepdf);
};
} catch (err) {
// Log any errors that occur during module loading
console.error('Failed to load the WASM module:', err);
}
};
// Create a script element to load the WASM JavaScript file
const script = document.createElement('script');
script.src = `${process.env.PUBLIC_URL}/Spire.Pdf.Base.js`;
script.onload = loadWasm;
// Append the script to the document body
document.body.appendChild(script);
// Cleanup function to remove the script when the component unmounts
return () => {
document.body.removeChild(script);
};
}, []);
// Function to extract highlighted text from PDF
const ExtractPDFText = async () => {
if (wasmModule) {
// Specify the input and output file names
const inputFileName = 'Sample.pdf';
const outputFileName = 'PDFTextHighlighted.txt';
// Fetch the input file and add it to the VFS
await wasmModule.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/`);
// Create an instance of the PdfDocument class
const pdf = wasmModule.PdfDocument.Create();
// Load the PDF document from the VFS
pdf.LoadFromFile(inputFileName);
// Create a string object to store the extracted text
let text = '';
// Iterate through each page of the PDF document
for (const page of pdf.Pages) {
// Iterate through each annotation on the page
for (let i = 0; i < page.Annotations.Count; i++) {
// Get the current annotation
const annotation = page.Annotations.get_Item(i)
// Check if the annotation is an instance of PdfTextMarkupAnnotation
if (annotation instanceof wasmModule.PdfTextMarkupAnnotationWidget) {
// Get the bounds of the annotation
const bounds = annotation.Bounds;
// Create an instance of PdfTextExtractOptions
const extractOptions = wasmModule.PdfTextExtractOptions.Create();
// Set the bounds of the highlight annotation as the extraction area
extractOptions.ExtractArea = bounds;
//
const textExtractor = wasmModule.PdfTextExtractor.Create(page)
// Extract the highlighted text and append it to the text string
text += textExtractor.ExtractText(extractOptions);
}
}
}
// Create a Blob object from the text string and download it
const blob = new Blob([text], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${outputFileName}`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Extract Highlighted Text from PDF Using JavaScript in React</h1>
<button onClick={ExtractPDFText} disabled={!wasmModule}>
Extract and Download
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.PDF for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
Published in
Extract/Read