QR Code Generator

Every code here is static. The content is encoded into the pattern itself, so the code is the data. There is no redirect through POLPROG, no short link, no account and nothing to expire or switch off. A code generated today still resolves to the same content in ten years, whether or not this site still exists.

That is the opposite of a dynamic or tracking QR code, which encodes a link to somebody else's server and stops working the moment that service shuts down, changes its pricing or loses the domain.

What it can encode

Link, plain text, Wi-Fi credentials, a vCard contact, email, SMS, phone, WhatsApp, geographic location and a calendar event. Each type has its own form, and each field is validated against the format it will be encoded into, so a Wi-Fi code that carries a password and a contact card that carries a name both come out well formed.

The encoder

A complete ISO/IEC 18004 encoder, written as a module of this site rather than pulled in as a dependency: segmenting the input into numeric, alphanumeric and byte runs, picking the smallest version that fits, building the bitstream, adding Reed-Solomon correction, placing the data in the zig-zag walk, then trying all eight masks and keeping the lowest penalty, exactly as the standard requires. Writing an encoder is only defensible if it is verified rather than trusted, so its finished matrices are compared bit for bit against a mature reference implementation across every mode, every correction level and a spread of versions, with a decode round trip on top.

Before you print it

A QR code that looks correct on screen can still be unreadable on paper, so the generator judges the result rather than just drawing it:

• Contrast between your two colours, with a warning below roughly 3:1, which is where readings start to fail.
• Inversion, because most decoders expect dark on light and some will not read the reverse at all.
• Module size at the export size you picked, since a symbol can be denser than the camera that has to resolve it.
• Quiet zone, the light border the scanner uses to find where the symbol starts. The standard asks for four modules; below that it warns, and at zero it refuses.
• Logo coverage, measured against the error-correction budget rather than guessed at.

Coverage grows with the square of the width, which is the part that surprises people: a logo 30 percent as wide as the code hides 9 percent of it, and one half as wide hides 25 percent. Adding a logo raises the correction level automatically, a logo past half the budget is flagged, and one past the whole budget is refused.

Where it runs

Entirely in your browser. The encoder, the preview, the logo compositing and the PNG and SVG export all run locally, and there is no API endpoint behind this page at all, so a Wi-Fi key, a private phone number or a contact card has nowhere to be sent even by accident. A logo you add is read with FileReader and never uploaded. Open your browser network panel while you use the tool and it stays empty.