Hi Product Hunt! 👋 I built TaxGuardHub after spending way too many hours trying to understand why an e-invoice XML was rejected by government tax portals. With European mandates rolling out (Romania's e-Factura, Germany's XRechnung, Polish KSeF, Peppol), developers and finance teams are hit with cryptic Schematron logs and raw regex patterns. Standard XML tools struggle because ISO Schematron requires full XSLT 2.0/3.0 support, which usually means spinning up heavy local Java utilities. Key things I focused on: 1. In-memory validation: Powered by SaxonC/GraalVM running official schemas for 7 EU jurisdictions. 2. Privacy first: Invoices contain sensitive corporate and financial data. Nothing is ever saved to disk or databases, and PII is automatically masked. 3. Fast diagnosis: Pointing out the exact line and element that caused the rejection, with actionable guidance. You can test any invoice XML directly in your browser without registration. Would love to get your thoughts and hear about any edge cases or tax rules you’ve had trouble validating!

TaxGuardHub

Universal EU e-invoice XML validator with zero PII retention

Universal EU e-invoice XML validator with zero PII retention