Free tools

Free QR code tools.

Scan a code, check colour contrast and work out the minimum print size — three free tools that run entirely in your browser.

• QR code scannerPoint your camera or drop an image. We decode it, follow every redirect and check each one against Google Web Risk before you open it.
• Contrast checkerPick module and background colours. The ratio updates live, and the code on the right is drawn in exactly those colours.
• Print size calculatorSet the distance people will scan from and the module count. The minimum printed size comes out in millimetres.