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A professional Word .NET library designed to create, read, write, convert and print Word document files in any .NET ( C#, VB.NET, ASP.NET, .NET Core, Xamarin ) application with fast and high quality performance.

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Spire.XLS for .NET

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A professional Excel .NET library that can be used to create, read, write, convert and print Excel files in any type of .NET ( C#, VB.NET, ASP.NET, .NET Core, Xamarin ) application.

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Spire.Presentation for .NET

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A professional PowerPointÂ® compatible library that enables developers to create, read, write, modify, convert and print PowerPoint documents in any .NET ( C#, VB.NET, ASP.NET, .NET Core, Xamarin ) application.

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Spire.PDF for .NET

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A professional PDF library applied to creating, writing, editing, handling and reading PDF files without any external dependencies within .NET ( C#, VB.NET, ASP.NET, .NET Core, Xamarin ) application.

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Spire.Email for .NET

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A professional Email library specially designed for developers to create, read and manipulate emails in any .NET ( C#, VB.NET, ASP.NET, .Net Core, .Net Standard, MonoAndroid, Xamarin iOS ) application.

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Spire.Barcode for .NET

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A professional barcode library specially designed for .NET developers ( C#, VB.NET, ASP.NET, .NET Core, .Net Standard, MonoAndroid, Xamarin.iOS ) to generate, read and scan 1D & 2D barcodes.

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Thank you so much for your excellent support and also a thanks to the development team which does great work too. I have now received support for Spire.PDF a couple of times.

Rico Scheller

SIEMENS

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Your support was perhaps the best software support I have ever experienced. I have been writing software for several decades and have worked with many 'support' teams...

Donald Young

L3Harris Technologies

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We are currently using XXX, and we want to switch entirely to your product Spire.PDF, because you offer some nice features (like merging a pdf on top of another pdf).

Paul Ootjers

Nieuws van de Bouw

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We are looking for a .NET assembly to create barcodes. It is important that different code types can be created reliably. Scalability is very important to enable machine scanning...

Andreas Maronde

Wein und Vinos GmbH

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TYPICAL USE CASES

NEWS & EVENTS

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A Collection of Tutorials to Help You Use Our Libraries Easily

09/09

2026

Add or Remove Attachments in PDF with JavaScript in React

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2026/09/09

PDF is a fixed-layout format that is easy to distribute, yet a single PDF usually carries only the body of a document. In practice you often want to hand over supporting material together with the...
09/09

2026

Add, Read, Modify, and Delete Excel Hyperlinks with JavaScript in React

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2026/09/09

Hyperlinks are a common element in Excel for quickly jumping to web pages, email addresses, or other resources, and they often appear in tables such as product websites, contact information, and...

09/08

2026

AI Agent vs. Raw LLM API: Document Layer in .NET

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2026/09/08

A modern LLM can understand the invoice and identify the information you need. But that is only half of the problem. Your application still has to turn that understanding into a real, formatted .xlsx...