Factur-X

Judgement

What it is

Building block

What it does

A PHP library to embed Factur-X XML into a PDF invoice, extract it again and validate it against the official schema.

Adopt it when

Your PHP system already produces PDF invoices and the XML, and needs to combine them into Factur-X files.

Watch out

It does not build the XML for you, and schema validation alone does not check business rules.

Ready for

Usable

Runs as

Library

Built with

PHP and FPDI

How established

Established: started 7 years ago, latest release v3.5.0.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Factur-X → Php-src → GCC → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

Open-source alternatives to Factur-X

1. 1
   Mustangproject ZUGFeRD

   Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)

   Building block Production-ready A Java application must produce or check German or French e-invoices.

   ★ 483 Apache-2.0 XSLT Active, pushed 17 days ago
2. 2
   ZUGFeRD horstoeko

   ZUGFeRD/XRechnung/Factur-X Library

   Building block Production-ready You maintain a PHP app already using it; new projects should start with its successor, horstoeko/invoicesuite.

   ★ 437 MIT PHP Active, pushed 32 days ago
3. 3
   ZUGFeRD-csharp stephanstapel

   Open source C# e-invoicing library. Enables creating and reading ZUGFeRD invoices.

   Building block Production-ready Only for existing .NET projects that need a short bridge; new work should look elsewhere.

   ★ 395 Apache-2.0 C# Active, pushed 24 days ago
4. 4
   Phase4 phax

   phase4 - AS4 client and server for integration into existing systems. Specific support for Peppol and CEF eDelivery built-in.

   Building block Production-ready You are building a Peppol access point or another AS4 integration in Java.

   ★ 246 Apache-2.0 Java Active, pushed 3 days ago
5. 5
   Quba-viewer ZUGFeRD

   Quba is a viewer for electronic invoices

   Complete system Usable Someone in accounts receives XML e-invoices and needs to read and check them locally.

   ★ 206 Apache-2.0 Kotlin Active, pushed 10 days ago
6. 6
   Python-drafthorse pretix

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   Building block Usable A Python application must emit ZUGFeRD invoices and the developer can work from the official specification.

   ★ 182 Apache-2.0 Python Active, pushed 5 days ago
7. 7
   ZATCA SallaApp

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   ★ 168 MIT PHP Active, pushed 21 days ago
8. 8
   UBL Invoice num-num

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   ★ 142 MIT PHP Active, pushed 13 days ago

Commercial e-invoicing libraries for ZUGFeRD, Factur-X, XRechnung and Peppol

1. 1
   Pagero Pagero

   Discover e-invoicing, tax, legal and regulatory compliance solutions from Thomson Reuters, helping organisations navigate complexity with confidence.

   Integration Production-ready A company trading across several countries must send and receive structured e-invoices to meet mandates.

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2. 2
   Avalara E-Invoicing Avalara

   Comply with international real-time reporting and e‑invoicing mandates. Automate financial operations with Avalara E‑Invoicing and Live Reporting.

   Integration Production-ready A multinational must comply with e-invoicing mandates in several countries and already uses Avalara for tax.

   Commercial