KSeFGPT

Free tools.For your KSeF invoices.

Create an invoice or correction, check XML and NIP, or convert a file. Choose a tool and get started without registering.

Choose a toolHow do limits work?

Generators

Prepare a new invoice or correction in XML format.

KSeF XML Invoice Generator

Fill out a simple online form and generate an XML invoice compliant with KSeF FA(3) schema. Ready file to upload to the National e-Invoice System.

  • Simple online form
  • Full KSeF FA(3) compliance
  • Download XML or copy to clipboard
Open Invoice Generator

KSeF XML invoice correction

Upload the original invoice XML, choose a line-item correction or cancellation to zero, and download the corrective invoice XML.

  • Line-item correction
  • Correction to zero
  • KSeF XML validator
Prepare correction XML

Validators

Check the invoice file and counterparty details before your next step.

KSeF XML Validator

Check the correctness of your XML invoice file before sending it to KSeF. Validate structure, NIP, amounts and FA(3) schema compliance - instantly, without registration.

  • Structure and XSD schema validation
  • NIP, date and amount verification
  • Detailed error and warning report
Open XML Validator

Company NIP Validator

Check whether a counterparty's NIP (Polish tax ID) is valid - format and checksum - before issuing a KSeF invoice. Instant validation, no registration.

  • Format (10 digits) and NIP checksum validation
  • Instant online result
  • Helps avoid an incorrect NIP on your KSeF invoice
Open NIP validator

Converters

Convert an invoice without retyping its data.

PDF to KSeF XML Converter

Upload a PDF invoice and AI will automatically extract data and generate XML ready for KSeF FA(3). Perfect for digitizing paper invoices.

  • AI data extraction from PDF
  • KSeF FA(3) XML generation
  • Preview extracted data before download
Open PDF Converter

XML to PDF Converter

Paste or upload a KSeF XML invoice and generate a readable PDF for printing, archiving or sending to business partners. Instant online conversion.

  • Instant XML to PDF conversion
  • Professional invoice layout
  • Data preview before PDF download
Open XML to PDF Converter

Free, with a shared limit

Without registering, you can use the tools a total of 2 times within 24 hours. This limit is shared across all tools.

Features and usage limits after signing in depend on your plan. Compare the plans if you need tools for your daily work.

Compare KSeFGPT plans

How are the tools working for you?

Share your thoughts - every review helps us make these tools better for you.

“Walidator wyłapał mi błąd w sumie P_15 na czterech fakturach z ERP, zanim je wysłałam do KSeF. Oszczędziłam dzień na korektach.”
Marta K. · Księgowa, biuro rachunkowe
“Najszybszy sposób na debug FA(3) – wklejam XML, widzę dokładnie który element nie trzyma schematu. Używam codziennie.”
Piotr W. · Dev / integrator
“Przed go-live KSeF przepuściliśmy cały hurt faktur testowych. Raport błędów jest czytelny nawet dla nietechnicznych osób w zespole.”
Anna S. · CFO, e-commerce
“Darmowe, bez rejestracji, działa w przeglądarce. Dokładnie tego potrzebowałem, żeby sprawdzić fakturę od nowego dostawcy.”
Tomasz L. · Właściciel, handel B2B