E-Invoice Validator – check online for free
Check your XRechnung or ZUGFeRD file directly in the browser – without logging in.
The e-invoice validator checks electronic invoices against the EN 16931 standard and reports any non-compliance to the second. Drag file into the box below, result will appear immediately.
At a glance (as of 2026):
- Supported formats: XRechnung from version 3.0, ZUGFeRD 1.0 to 2.x (incl. Factur-X)
- Test basis: KoSIT validator (official reference of the federal government) and Mustang validator
- Cost: €0 – no registration, no watermarks
- Data protection: Processing in Azure cloud (EU), no permanent storage of the file
- Input: XML or PDF/A-3 with embedded XML, up to 10 MB per file
* Your file will be processed exclusively for the technical validation of the e-invoice. The check is carried out automatically on the basis of the standards of KoSIT and Mustang Validator in an Azure cloud environment. There is no permanent storage or content evaluation. By uploading, you agree to our privacy policy .
The switch to electronic invoices such as ZUGFeRD and XRechnung optimizes the invoicing process, saves time and reduces costs. But in order for the digital documents to be processed correctly by the recipient systems, they must meet a certain standard.
This is exactly where our e-invoice validator comes into play. He checks whether your invoice is formally correct and conforms to the respective specification (e.g. EN 16931 or XRechnung standard). If you work properly here, you avoid rejections by the recipient – and thus also the typical payment delays that such a rejection entails.
