QR Code Generator

What a QR code is

A QR code is a two-dimensional barcode that a phone camera reads instantly. It can hold a link, text, a contact card or Wi-Fi network details.

A static code contains the information itself and cannot be changed after printing. A dynamic code contains a short address that redirects, so the destination can be changed later, but it depends on the service that maintains the redirect.

Size and quiet zone

A practical rule is for the code to be at least 2 cm wide, and about a tenth of the distance it will be scanned from. Around it, leave a blank margin at least four of its small squares wide.

Contrast and error correction

A dark code on a light background is the safest. Inverted or pale colours trouble some phones. QR codes have four error-correction levels, L, M, Q and H, which recover about 7, 15, 25 and 30% of damaged data respectively. A higher level makes the code denser, so at a very small size it does not always help.

Before you send it to print

A printed code cannot be fixed, so check it first:

1. Use a vector file or a large enough image.
2. Keep the link short: less data means larger squares.
3. Scan a test print at the real size with several phones.
4. Follow the link through and check the page on a phone.