Help

Which error correction should I pick?

Error correction lets a phone read the code even when part of it is dirty, scratched or covered. Higher levels survive more damage but make the code denser.

L recovers about 7% and is fine for clean screens. M recovers about 15%. Q recovers about 25% and is the default here, because it suits both print and screens. H recovers about 30% and is switched on automatically while a logo is shown, since the logo covers part of the code.

Why won't my code scan?

Check the status next to the preview first. Codes need a clear difference between code color and background: dark on light scans best, and light on dark is not supported by every camera.

Keep the blank border around the code (the quiet zone), print it large enough for the distance it is scanned from, and avoid shiny surfaces. A code that holds a lot of text has smaller modules, so a shorter link helps. Always test a printed code with a phone before you print many.

Do codes expire?

No. Codes made here are static: the content is stored in the pattern itself, so they never expire and keep working without this site.

A link only works as long as the page it points to is online. If the address changes, make a new code.

Where are my codes stored?

Only on this device, in your browser. The library lives in the browser's IndexedDB, the current draft and your settings in local storage. Nothing is sent to a server and there is no account.

Clearing your browser data deletes them. Other browsers and devices do not see them. You can turn saving off with Remember my codes in Settings, or delete everything with Clear library.

Which file format should I download?

PNG works everywhere, for screens, documents and messages. SVG and PDF are vector files that stay sharp at any size, which suits print shops and design tools.

Can I add my logo?

Yes. Upload a PNG, JPG or SVG of up to 1 MB. It sits in the middle on a plate in the background color, and error correction is set to H while it is shown. The file stays on your device.