KSeF Viewer is the fastest way to keep invoices from Poland’s National e-Invoicing System (KSeF) at hand. Sign in with a KSeF token or certificate and instantly see your company’s purchase and sales invoices — on iPhone and iPad.
Browse invoices
- Purchase and sales invoices from KSeF
- Clear FA(3) invoice preview with a QR verification code
- Quick filters: period, counterparty, amount, status
- Mark invoices as approved or rejected and assign categories
- Works offline — downloaded invoices are available without internet
PRO
- Issue FA(3) invoices straight to KSeF — buyer details fetched from the Polish VAT taxpayer register (“white list”)
- Correction invoices (e.g. discount, wrong price) and advance invoices
- Several companies in one app — e.g. a sole proprietorship and a company
- Cost and revenue analytics: months, counterparties, categories
- Export invoices to PDF and XML
- Unlimited invoice previews
PRO is a monthly or yearly App Store subscription with a one-week free trial. The free version has a monthly limit of invoice previews.
Security and privacy
- The app connects directly to KSeF — your credentials and invoices never go to any third-party servers
- Token and certificate stored in the iOS Keychain
- Face ID or passcode lock
- No ads, no analytics, no tracking
Try it without signing in
Demo mode shows sample invoices and every feature of the app — no KSeF account needed, and nothing is sent to the system.
The app’s interface is in Polish, because it serves the Polish e-invoicing system.
Help & contact · Privacy Policy
KSeF Viewer is an independent app and is not affiliated with the Polish Ministry of Finance. It uses the public KSeF API.