miPDFlib 0.6.0

miPDFlib

Open-source PDF library for .NET - create, edit, sign and validate PDFs without native dependencies.

An open-source (Apache-2.0) PDF library for .NET 8 / .NET 10: pure managed code, no native dependencies. Create, read, modify, merge, fill forms, extract text, encrypt and digitally sign (PAdES) PDF documents.

dotnet add package miPDFlib

The namespace is MiPdf (using MiPdf;). Versions up to 0.2.3-alpha were published under the package ID MiPdf, which is deprecated; switch the package reference to miPDFlib, no code changes are needed.

Why miPDFlib?

• Apache-2.0: free in closed commercial products - no AGPL obligations, no revenue limits, no licence key.
• eIDAS-ready signatures: PAdES B-B to B-LTA, HSM/cloud signers and two-step signing, built on .NET cryptography without BouncyCastle.
• Archiving and e-invoices: PDF/A, PDF/UA and ZUGFeRD / Factur-X / XRechnung hybrid invoices.
• Coming from iText or Syncfusion? See the comparison and the migration guide.

Versioning: all planned feature areas are implemented and tested. Releases follow Semantic Versioning; until 1.0 the public API may still change between minor versions (see the changelog).

Features

The only dependency is System.Security.Cryptography.Pkcs (MIT, Microsoft) for CMS signatures.

Quick start

using MiPdf;
using MiPdf.Fonts;
using MiPdf.Graphics;
using MiPdf.Layout;
using MiPdf.Signatures;

// create
using var pdf = PdfDocument.Create();
using (var layout = new LayoutDocument(pdf, PageSize.A4, new Thickness(50)))
{
    layout.Add(new Paragraph("Hello miPDFlib", PdfStandardFont.HelveticaBold, 20));
    var table = new Table(1, 3);
    table.AddHeaderCell("Pos"); table.AddHeaderCell("Description");
    table.AddCell("1"); table.AddCell("Consulting");
    layout.Add(table);
}
pdf.Save("hello.pdf");

// modify
using var doc = PdfDocument.Open("hello.pdf");
doc.GetPage(1).AddTextWatermark("DRAFT");
doc.Save("hello-draft.pdf");

// sign
byte[] signed = PdfSigner.Sign(File.ReadAllBytes("hello.pdf"), CertificateSigner.FromPfx("me.pfx", "pw"),
    new PdfSignatureOptions { Reason = "Approved", TimestampClient = new HttpTimestampClient("http://timestamp.digicert.com") });

Documentation

API reference and guides – every namespace, class and method, searchable.

How-to guides: Sign a PDF with PAdES in .NET · Create a ZUGFeRD / XRechnung invoice in C# · Replace iText with an Apache-2.0 library

Sample ASP.NET Core web API with Dockerfile: samples/MiPdf.WebApi

• Creating documents: fonts, canvas, images, flow layout, tables
• Opening and manipulating: save options, pages, merge/split, stamps, bookmarks, links
• Text extraction: text, words, positions, search
• Redaction: removing confidential content
• Forms: read, fill, create and flatten form fields
• Security: passwords, permissions, AES/RC4 encryption
• Signatures: PAdES signing, HSM/external signers, time-stamps, verification
• Accessibility / PDF/UA: tagged PDF, PDF/UA, checker
• Attachments and e-invoices: embedded files, ZUGFeRD / Factur-X
• Barcodes: QR, EPC payment codes, Data Matrix, Code 128, EAN
• Migration from iText / Syncfusion and comparison
• Articles: ZUGFeRD in .NET (e-invoices), miPDFlib or aiPDFlib? (how it was built) and iText or Syncfusion PDF? (now including miPDFlib)
• Office documents to PDF: recommended conversion with LibreOffice via Gotenberg

Used by

• miPDFsign Community - open-source (Apache-2.0) signature app for Windows tablets: handwritten signatures with biometric data as PAdES B to LTA
• miPDFsign and miPDFsign Cloud - commercial signing app and service by the author (mitterbucher.com)

License

Licensed under the Apache License, Version 2.0. See LICENSE and NOTICE. Copyright 2026 Wolfgang Mitterbucher.

Source code, issues and contributions: github.com/Mibuw/miPDFlib.

Author

Wolfgang Mitterbucher, Software Engineering & Digital Identity, Leonding (Austria): www.mitterbucher.com · LinkedIn · office@mitterbucher.com