EN16931: The Backbone of European E-invoicing
Why EN16931 is so important and how it impacts your business.
Read article1. What is ZUGFeRD?
Learn what ZUGFeRD is, how it combines PDF and XML, and why it's the EU standard for e-invoicing.
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DOCUMENTATION
Documentation & Knowledge Base
Everything about ZUGFeRD, Factur-X and European e-invoicing in one place.
2. What is Factur-X?
Discover Factur-X, the French implementation of ZUGFeRD for the French market.
Read more3. EN16931 Standard
Understand the EN16931 standard and its requirements for compliant electronic invoices.
Read more4. PDF/A-3 Explained
Learn how PDF/A-3 ensures long-term archiving with embedded XML invoices.
Read more5. XML Structure
Explore the XML schema, elements and data model used in ZUGFeRD / Factur-X invoices.
Read more6. Profiles (Basic, Comfort, Extended)
Compare the ZUGFeRD profile levels and choose the right one for your business needs.
Read more7. Validation Guide
Step-by-step guide to validate your invoices and ensure full compliance.
Read more8. Mustang Validator
Learn about Mustang, the official open-source validator for ZUGFeRD and Factur-X.
Read more9. API Documentation
Integrate ZUGFeRD Pro with your ERP, CRM or billing system using our powerful API.
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ZUGFeRD vs. Factur-X: What's the Difference?
A detailed comparison between the two e-invoicing standards.
Read articleHow to Validate ZUGFeRD Invoices with Mustang
A complete guide to using the Mustang validator step by step.
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