Logos and the scan test

Press Add logo and upload a PNG, JPEG, WebP or SVG under 200 KB. Anchorpost raises the code’s error correction automatically so a logo of up to about a quarter of the area still scans; the size slider keeps you inside that range.

Run scan test decodes the code the way a phone would, including at a small size and tilted, and warns in plain English when:

• the contrast between dots and background is below 4:1,
• the logo covers too much of the code,
• the printed size you chose is too small for the amount of data.

Fix the warning before printing. A code that passes the scan test scans on real phones.