xrechnung.dev, the invoice validator for Germany’s XML-and-PDF paperwork

Field notes

The service accepts either pure XML XRechnung files or ZUGFeRD PDFs, then returns validity information, warnings, errors, and invoice contents. Its API separates validation, parsing, and generation, with an OpenAPI reference linked from the homepage. The visible free tier allows 50 documents per month without registration, while the upload interface limits files to 5 MB. The page states that processed invoices are discarded after checking and that only an anonymous usage counter is retained.