KoSIT ValidatorXRechnung

XRechnung Validator

Free XRechnung Validator Online with dual validation engine: KoSIT Validator for EN 16931 compliance and Mustang Validator for extended business rules. Upload your XRechnung XML or ZUGFeRD PDF and receive a comprehensive validation. XRechnung validation runs server-side in Germany to keep your data safe and protected.

KoSIT & Mustang Validator

Dual validation with the official KoSIT Validator (EN 16931) and Mustang Validator (extended rules). Fully supports XRechnung XML and ZUGFeRD PDF.

EN 16931 Compliance Check

Full XRechnung validation: Leitweg-ID, VAT-ID, Buyer Reference, and all required fields are checked against official specifications.

Online XRechnung Validator

Fast online validation directly in the browser. Results appear immediately after upload, including a detailed validation report and correction hints.

How it works

Step 1

Upload invoice

Select an XML or PDF file and submit it directly here.

Step 2

Start validation

Our backend check verifies the structure, required fields, and plausibility.

Step 3

Get results

You will immediately see whether the invoice is compliant and what is still missing.

Frequently Asked Questions about the XRechnung Validator

Everything you need to know about the KoSIT Validator and online XRechnung validation

What is the KoSIT Validator for XRechnung?

The KoSIT Validator is the official validator from the Coordination Office for IT Standards (KoSIT) for checking XRechnung documents for EN 16931 compliance. It verifies whether an electronic invoice contains all required fields and the correct structure according to the XRechnung specification.

How does the XRechnung Validator Online work?

Simply upload your XML or PDF invoice (ZUGFeRD/Factur-X). Our system validates the invoice server-side using the KoSIT Validator and immediately shows whether the invoice is compliant. You receive a detailed report with all errors, warnings, and correction hints.

Which formats does the XRechnung Validator support?

The validator supports XRechnung XML files as well as PDF files with embedded XRechnung or ZUGFeRD/Factur-X. Both formats are validated according to the EN 16931 standard.

Is the XRechnung Validator Online free?

Yes, our XRechnung Validator Online is completely free to use. You can validate as many invoices as you like, with no hidden costs or restrictions.

What is checked during XRechnung validation?

The KoSIT Validator checks full EN 16931 compliance: required fields such as Leitweg-ID, VAT-ID, Buyer Reference, correct XML structure, business rules, data formats, and adherence to the XRechnung specification. For ZUGFeRD, the embedded XML data is additionally extracted and validated.

How secure is the online validation of my invoices?

Your invoices are validated exclusively server-side in Germany. Data is transmitted encrypted and is not permanently stored after validation, unless you explicitly choose the save option.

Free KoSIT & Mustang Validator for XRechnung Online

Our XRechnung Validator Online uses two powerful validation engines: the official KoSIT Validator for EN 16931 compliance checks and the Mustang Validator for extended business rules. Whether you want to validate XRechnung XML or ZUGFeRD PDF – our free XRechnung Validator Online offers you a comprehensive and secure solution.

XRechnung validation runs server-side in Germany with both engines in parallel, checking all required fields, the correct structure, and compliance with business rules according to the current XRechnung specification. Use our KoSIT Validator XRechnung with the additional Mustang Engine for a professional and complete validation of your e-invoices.

XRechnung Validator

Free KoSIT & Mustang Validator for XRechnung Online