Canary: check e-invoices before posting and payment
Canary is zappmedia’s free browser tool for checking electronic invoices. It compares ZUGFeRD and Factur-X PDFs with embedded XML and checks standalone CII and UBL invoice XML, including XRechnung.
Technical validation, PDF/XML comparison and optional AI mapping highlight differences in recognised or derived data, such as IBANs, amounts and taxes. Multiple invoices can be checked together, and invoice XML can also be converted into a ZUGFeRD/Factur-X PDF.
The tool requires no registration. Published information states that processing takes place on a server in Germany and uploaded files are deleted automatically within 15 minutes. An unremarkable result does not replace professional invoice review.














