PDFsharp review
A free .NET PDF library for creation, editing, forms, signatures, and core document operations.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
PDFsharp is an open-source .NET library for developers embedding PDF functionality in applications. It supports PDF creation, processing, modification, merging, splitting, drawing, rendering, annotations, encryption, forms, and digital signatures. The library covers .NET Framework, .NET Standard, and modern .NET versions, with Core, GDI, and WPF builds. Core supports platforms supported by .NET, while GDI and WPF target Windows. Its language coverage includes C# and other .NET languages, making it a focused option for teams building PDF workflows within the .NET ecosystem.
The library’s main strength is breadth across core PDF operations rather than a single specialized feature. Developers can generate documents with drawing and graphics operations, handle BMP, PNG, GIF, TIFF, and JPEG images, embed and subset fonts, and add text or rubber-stamp annotations. PDFsharp also supports embedded documents, access permissions, encryption, forms, and digital signatures. This makes it suitable for applications that need direct document creation and manipulation without moving outside a .NET codebase. Its open-source MIT license and free plan further suit projects that want a no-cost PDF foundation.
PDFsharp is less suited to teams seeking a wider document-processing platform. It does not provide AI features, and its positioning is narrower than SDKs that add OCR, conversion, or broader integration coverage. Platform choice also matters: the Core build is the cross-platform path, while GDI and WPF builds are Windows-specific. Choose PDFsharp when your priority is free, code-level PDF creation and manipulation in .NET. Consider an alternative when OCR, conversion, extensive integrations, or AI capabilities are central requirements.
PDFsharp pros and cons
- Where it wins
- Covers creation, editing, merging, splitting, annotations, forms, and signatures
- Supports Windows, Linux, macOS, and other .NET-supported platforms
- Open-source MIT license with font, image, encryption, and graphics support
- Where it doesn't
- Does not provide AI features
- Narrower coverage than SDKs with OCR and document conversion
- GDI and WPF builds target Windows-specific environments
PDFsharp fact sheet, pricing and score →
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