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Checking the invoice against EN 16931 …
The file goes to our API over HTTPS for the validation only. More in the privacy notice.
Upload an e-invoice and check it against EN 16931 and the German KoSIT rules right away. Free, no sign-up.
The file goes to our API over HTTPS for the validation only. More in the privacy notice.
The tool sends your file to our validation API, which checks it with the Mustang Project and the KoSIT validation tool against the EN 16931 standard and the German business rules (BR-DE). You get the detected format and profile, every error and warning with its rule ID and the field it belongs to, plus a concrete fix hint. With the Automate plan you fix the errors right here: we repair what is safe to repair, ask for the rest and hand you back a valid invoice.
Need the validation inside your own system or AI agent? Use the REST API or the MCP client – same engine, driven by code. It works on the command line too: curl, Mustang CLI and CI pipelines.
Whether you want to check a ZUGFeRD invoice, validate an XRechnung or simply validate an e-invoice: the validator detects the format on its own and checks against the same standard (EN 16931) and German KoSIT rules that your recipients apply. So you see before you send whether your invoice will go through.