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Empowering businesses across Europe to effortlessly comply with XRechnung regulations. Join hundreds who've automated their invoice conversion process.

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  • XRechnung Validator

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100% FreeOfficial KoSIT Report

ZUGFeRD / Factur-X Validator

Validate your ZUGFeRD and Factur-X XML invoices against EN 16931 standards. Free, instant, and privacy-friendly.

No sign-up required • Instant results • Privacy-friendly

Upload XML Invoice

Drag and drop your XML file or click to browse

XML • Max 10MB

100% Free

No hidden costs, no credit card required

Privacy-Friendly

Your data stays in your browser

No Data Storage

Files are not stored after validation

What is KoSIT Validation?

KoSIT (Koordinierungsstelle für IT-Standards) is the German coordination office for IT standards. The KoSIT validator is the official tool for checking XRechnung and other e-invoice formats against the EN 16931 European standard. It performs both XML schema validation and Schematron business rule checks.

Using the official KoSIT validator ensures your invoices will be accepted by German public authorities and other recipients requiring XRechnung compliance. Our free online validator uses the same official validation engine.

What is ZUGFeRD / Factur-X?

ZUGFeRD is a German-French hybrid e-invoice format that embeds structured XML data inside a PDF/A-3 document. Factur-X is the French equivalent based on the same EN 16931 standard. Both use CII (Cross-Industry Invoice) syntax and support profiles from MINIMUM to EXTENDED, allowing human-readable and machine-readable invoicing in a single file.

Learn more about the ZUGFeRD Format and ZUGFeRD Profile Guide.

EN 16931 European Standard

EN 16931 is the European standard for the semantic data model of electronic invoices. It defines the core elements required for cross-border e-invoicing within the EU. XRechnung implements EN 16931 with additional German-specific rules (CIUS). Validation against EN 16931 ensures your invoices meet the minimum requirements for European e-invoicing.

Learn more about EN 16931 →

Common Validation Errors

When validating XRechnung invoices, you may encounter various error codes. Here are the most common issues:

  • BR-DE-1: Leitweg-ID is required for German public sector invoices
  • BR-CO-10: Sum of line amounts must equal the invoice total
  • BR-DE-15: Buyer reference (BT-10) is mandatory
  • BR-S-08: Tax category codes must be valid

View all KoSIT error codes and solutions →

How to read validation results

KoSIT validation outputs schema checks (XML structure) and Schematron rules (business rules). Understanding both helps you fix issues quickly and ensure the invoice is accepted by recipients.

  • Schema errors usually mean the XML is malformed or elements are in the wrong place.
  • Business rule (Schematron) errors point to missing mandatory fields or invalid values (codes, totals, dates).
  • Each finding contains a rule code (e.g., BR-DE-1) and the affected field (BT/BG reference when available).
  • After fixing, re-validate until the invoice is fully compliant.

Related ZUGFeRD Tools

PDF to ZUGFeRD

Convert PDF invoices to ZUGFeRD hybrid format

PDF to Factur-X

Convert PDF invoices to Factur-X hybrid format

ZUGFeRD Profiles

Compare ZUGFeRD profiles from MINIMUM to EXTENDED

XRechnung Validator

Validate XRechnung XML invoices

XRechnung Viewer

View and analyze XRechnung XML files

Compliance Guides

E-invoicing standards and regulations

Frequently Asked Questions

Is this ZUGFeRD validator really free?

Yes, our ZUGFeRD and Factur-X validator is 100% free with no usage limits. We use the official KoSIT validation engine and do not require registration or payment.

Is my data secure?

Your invoice data is processed in your browser and on our secure servers. Files are not stored after validation and we do not share your data with third parties.

Which ZUGFeRD versions are supported?

We validate ZUGFeRD 2.1 and 2.2 XML files as well as Factur-X invoices. The validator checks both CII and UBL syntax formats against EN 16931.

What standards are checked?

Our validator checks against EN 16931 (European e-invoice standard), ZUGFeRD/Factur-X profile rules, and CII syntax requirements. Both XML schema and Schematron business rules are validated.