EU E-Invoice API

Validate XRechnung – with the official KoSIT rules

Check an XRechnung in UBL or CII against KoSIT's validator configuration – the same rules German recipients and public authorities apply. Every finding links to the rule explained.

This page in: Deutsch

Checked in memory only, nothing is stored. 5 validations per day and IP address, no sign-up.

What is checked

  • XML Schema UBL 2.1 (Invoice, CreditNote) or UN/CEFACT CII.
  • The CEN rules of EN 16931 (BR-*, BR-CO-*, BR-CL-* …) and the German rules BR-DE-*, with the severities of the KoSIT configuration.
  • The XRechnung extension and CVD, when the invoice declares them.
  • Mandatory details such as the buyer reference / Leitweg-ID (BT-10, BR-DE-15) and the payment instructions (BG-16, BR-DE-1).

Rule sets used

Rule setPublished byVersion
XRechnung with the CEN EN 16931 rulesKoSIT, CEN3.0.2

Every rule explained

Every finding in the result links to a page with the official rule text, the severity per rule set and the technical test. The rules of this page:

All 3289 validation rules

Automate the check

The same validator as a REST API: one call with your API key, the result as JSON. The Free plan includes 100 documents a month.

Get a free API key

curl -H "Authorization: Bearer $API_KEY" \
     -H "Content-Type: application/xml" \
     --data-binary @xrechnung.xml \
     "https://einvoice-api-main-f5141d8.zuplo.app/v1/validate"

Privacy

The file is sent encrypted through our API gateway (Zuplo) to our server in Germany, checked in memory only and discarded after the response. It is neither stored nor logged. To count the validations per day, the gateway uses your IP address; the counter expires after 24 hours. This page sets no cookies. Where you can, use test or anonymised invoices. Details in the privacy policy (German).

Frequently asked questions

Is the validator free?

Yes. You can validate 5 files a day without signing up. For more documents and for validating inside your own software there is the API, with a free plan too (100 documents a month).

Are my invoices stored?

No. The file is checked in memory only, on servers in Germany, and discarded after the response. It never reaches a disk or a log.

Is the result binding?

The validator uses the official rule sets in the version in force and names them in the result. Whether a recipient or a platform accepts the invoice is up to them. Not legal or tax advice.

Does the validator send my invoice?

No. It only validates. Sending through Peppol, the SDI, KSeF or a platform is up to your provider.

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