Does checking cost anything?

Not within the daily free allowance. After that a check uses credits; prices are on the pricing page.

Are my invoices stored?

No. Files stay in the memory of the server in Germany only and are deleted after one hour at the latest. Logs contain no file names or contents.

Which formats can I check?

XRechnung as XML in the UBL and CII syntaxes and ZUGFeRD as PDF.

Does valid mean the invoice is correct for tax purposes?

No. The check establishes formal correctness under the rules of the norm. For tax questions please ask your tax adviser.

Validate an e-invoice: how to check XRechnung and ZUGFeRD

An e-invoice can be formally faulty without it being visible at first glance. A validator checks the file against the rules of the norm. Here is how to proceed and which errors are the most common.

Updated on 26 October 2026

Why validate?

Recipients and authorities check incoming e-invoices automatically. If the file is faulty it is rejected or must be issued again. A check before sending saves queries and time, and a check before booking shows whether a received invoice is usable.

How to validate with Wandlix

The check takes a few seconds:

Choose a file: an XRechnung (XML, UBL or CII) or a ZUGFeRD PDF. With an account you can check up to 20 files at once.
The file is checked with the official KoSIT validator and the XRechnung rules. Files stay in memory only and are deleted after one hour at the latest.
Read the result: valid or faulty, with the error messages, the key invoice data and a summary.

Validate e-invoice

Common errors

These points cause error messages most often in practice:

Leitweg-ID missing for invoices to public authorities (buyer reference)
Totals do not add up: rounding differences between lines, tax and total
VAT ID or tax number of the issuer missing
Tax category does not match the tax rate, or the exemption reason is missing for tax-exempt services
Incomplete payment details, for example no valid IBAN
Date in the wrong format or mandatory fields empty
For ZUGFeRD: profile too small (MINIMUM, BASIC WL) or the XML is not embedded correctly in the PDF/A-3

What the result means

Errors must be fixed, otherwise the invoice counts as formally invalid. Warnings and notes are not grounds for rejection but should be noted. A valid invoice is built correctly in form. That does not mean that amounts, tax rates or the description of the service are right in substance. Validation does not replace a tax review.

More tools around the e-invoice

An e-invoice can be shown as a readable PDF, and you can pull the XML out of a ZUGFeRD file. Create your own invoices as XRechnung or ZUGFeRD PDF and validate them straight away.

Frequently asked questions

Does checking cost anything?: Not within the daily free allowance. After that a check uses credits; prices are on the pricing page.
Are my invoices stored?: No. Files stay in the memory of the server in Germany only and are deleted after one hour at the latest. Logs contain no file names or contents.
Which formats can I check?: XRechnung as XML in the UBL and CII syntaxes and ZUGFeRD as PDF.
Does valid mean the invoice is correct for tax purposes?: No. The check establishes formal correctness under the rules of the norm. For tax questions please ask your tax adviser.

Try it now

Check an e-invoice in a few seconds. Your file stays in the memory of a server in Germany only and is deleted after one hour at the latest.

Validate e-invoice

More guides

These guides do not replace tax or legal advice. For questions about your own case please ask your tax adviser.