XSDHub

XSDHub checks whether an e-invoice follows the official rules before it is sent. It covers the EU standard EN 16931 and the national rules of Germany (XRechnung), France (Factur-X), Poland (KSeF FA(3)), Romania (RO e-Factura) and Croatia (HR-CIUS).

Each result names the official rule version it used and the date it was checked. Every error shows the rule it breaks, where it sits in the file and how to fix it. Across its validators, all 41,053 checks against selected official test cases from CEN, KoSIT, the W3C and national tax authorities match the expected results.

Beyond invoices, XSDHub checks SAF-T audit files, SEPA payment files (with profiles based on the published rules of Dutch, German, Belgian and French banks), ISO 20022 bank messages, DAC7, CBAM and XBRL, plus XML and XSD validation. It runs in eight languages and offers an API, CLI, GitHub Action and an MCP server for AI agents. Invoices are deleted after the check and their content is not logged.

A quick check is always free. Pro and Team plans add saved projects and higher limits.