KSeF Guard

Walidator faktur FA(3) offline — sprawdź XML, zanim wyślesz do KSeF. Offline FA(3) invoice validator — check your XML before you send it to KSeF.

🌐 ksefguard.pl · ⬇️ Pobierz / Download · 📄 Conformance report · 📦 Repo & issues

KSeF Guard is an offline validator for Polish FA(3) / KSeF e-invoices. It checks the full FA(3) XSD plus 128 business rules with documented legal sources (the Polish VAT Act and the official FA(3) brochure) — catching the issues KSeF itself does not enforce, before you submit. Everything runs locally — invoice data never leaves the device.

(KSeF is Poland's national e-invoicing system; FA(3) is its mandatory invoice XML schema.)

KSeF checks syntax. The law requires substance. In a test of 256 invoices against the official KSeF test API, the system accepted 98 non-compliant invoices. KSeF Guard catches all 107 issues the API misses — 55 legal requirements and 52 best-practice / security checks — before the invoice reaches the tax office.

• ✅ Full FA(3) XSD validation (schema 1-0E) + 128 business/legal rules
• ✅ Offline — no cloud uploads; private by design
• ✅ Bilingual reports (PL/EN) with exact error location, "what to fix", and the legal quote
• ✅ Batch validation of whole folders of client invoices
• ✅ Export to PDF / CSV / JSON (audit-ready)
• ✅ Windows desktop app + Linux CLI (for automation / CI-CD)

Primarily accounting offices (biura rachunkowe) and finance teams submitting FA(3) to KSeF at volume — who need pre-submission certainty and client-ready reports.

The free tier runs the full rule set. Paid tiers are office throughput + client reports — batch, exports, more machines, audit trail.

• 🌐 Website: https://www.ksefguard.pl
• ⬇️ Download: https://www.ksefguard.pl/en/download/
• 📄 Conformance report (PDF, 256-invoice test): https://www.ksefguard.pl/downloads/conformance-report-v9.pdf
• 📦 Public repo + issue tracker: https://github.com/KSeFGuard/ksef-guard
• ✉️ Support: [email protected]