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What is a QR code and what is it used for?

A QR code is a graphical marker placed on an invoice visualization (in PDF format or on a printout) that allows for quick document verification without the need to manually enter data. After scanning the code with a phone or scanner, the user is redirected to a dedicated verification page where they can check whether the invoice is in KSeF, and after entering the required data (such as NIP, PESEL, amount, or date) download its preview from the system.

The QR code does not replace the electronic invoice itself in KSeF, but rather simplifies access to the document and verification of its authenticity when the invoice is transmitted outside the system, for example via email or in paper form.

Invoices issued online and offline invoices already submitted to KSeF

On the visualization of such invoices, a single QR code appears containing, among other things, the KSeF number. This code allows for easy confirmation that the document has been accepted by the system and enables downloading its preview. For the buyer, this is the simplest way to verify that the PDF file or printout in their possession corresponds to an actual electronic invoice in KSeF.

Invoices issued in offline mode that have not yet been submitted to KSeF

In the case of invoices issued in offline mode that have not yet been submitted to the system (for example, in offline24 mode), the visualization must contain two QR codes.

• The first code, marked "OFFLINE," provides access to the invoice data and allows for its verification until the document is submitted to the system.

• The second code, marked "CERTYFIKAT," serves to confirm the identity of the issuer — its generation requires a previously downloaded KSeF type 2 certificate.

Thanks to this solution, even before the system assigns a KSeF number, the recipient can verify that the invoice originates from the appropriate entity and has not been falsified.

What is KSeF?

How to use KSeF?

What is an e-Invoice (e-Faktura)?

From when do invoices have to be issued in KSeF?

How can sole proprietors who don’t have internet access and don’t use a computer issue invoices?

Do invoices from foreign suppliers have to be reported in KSeF?

What is offline24 mode?

What is the difference between online and offline mode? What is the KSeF certificate for?

Do invoices for consumers (B2C) have to be issued in KSeF?

How to issue an invoice for a customer outside the EU?

By when must an invoice be submitted to KSeF?

Do I have to send an online invoice on the same day I issue it?

What does the system check before assigning a KSeF number?

What if I send an online invoice on 1 February but receive the KSeF number only on 2 February?

What if an invoice contains calculation errors, e.g., the total amount due is incorrect?

Will it be possible to edit an issued invoice if an error is found?

What invoice issuance modes will be available in KSeF 2.0?

What is a QR code and what is it used for?

How does a sole proprietor obtain access to KSeF?

How is the initial authorization assigned in KSeF for a taxpayer that is not a natural person?

How to submit the ZAW-FA application?

How to grant KSeF authorization for an accounting company?

How to create a KSeF certificate?

How to create a KSeF token?