Open-Source Libraries and Tools

Inofficial page on free Factur-X, Order-X and Deliver-X (and XRechnung) libraries and tools.

ZUGFeRD/Factur-X is a standard to embed machine readable XML in electronic invoice PDFs.

Libraries

Python

  • Akretion’s factur-x is a BSD-licensed library

PHP

C++

.net/ C#

Java

  • Konik GPL Java and C# library for ZUGFeRD 1

  • Mustang is an APL Java and .net library for ZUGFeRD 1 and 2(=Factur-X) and a command-line tool to extract, combine and validate. It’s open-source REST API has been continued commercially.

Delphi

PDF tools

Creation

  • Ghostscript can also be used to create PDF/A files from ordinary PDF

  • iText RUPS can be used, along with a good hex editor to inspect the PDF internal structure, or a Windows-only alternative

  • MuPDF for windows and linux, mutools show can display simple internal structures

  • Open source AI/invoice recognition InvoiceNet

  • Open source OCR/pattern based invoice recognition invoice2data

Validators

  • FNFE uses a odoo plugin which is based on VeraPDF and the CEN Schematron

  • The ZUGFeRD-community online validation is based on Mustang and embeds VeraPDF and the CEN Schematron as well

  • Philip Helgers open-sourve-validator Phive can validate almost any invoice XML, including XRechnung, unfortunately not covering PDF-hybrid formats

  • VeraPDF, validates PDF-A,

  • Exiftool allows to quickly check PDF/A meta data,

Official Sources

  • The ZUGFeRD Infopaket includes schema and schematron, example files, specs, codelist and a refererence (called technical appendix)

  • The CEN Schematron can be used to validate ZUGFeRD/Factur-X XML

Other tools

ZUGFeRD/Factur-X Creating

ZUGFeRD/Factur-X Consuming

  • Open-source homebanking application: Hibiscus

Display

Miscellaneous