Check before you print.

Three free tools for links, colour contrast and physical size.

QR destination checker

Paste a decoded link or choose a QR image. Skanna follows the link and reports technical warnings.

Choose QR image

Dark code patterns on a light background are the most reliable.

Code colourBackground

12.9 to 1Strong contrast

Estimate a starting size, then test the real material and lighting before the full print run.

Expected scan distance

Amount of data

Start at30 mm1.18 inches wide