A QR code is only useful if every phone can read it on the first try. This guide covers the choices that make the difference: content type, size, contrast and error correction.
Pick the right content type
Start by deciding what the code should do — open a link, show plain text, share contact details or join a Wi-Fi network. Encoding only what you need keeps the pattern simple and faster to scan.
Size and quiet zone
Print at 2 cm or larger for posters, and always leave a clear margin (the “quiet zone”) of at least four modules around the code. Crowding the edges is the most common reason a scan fails.
Contrast and colour
Dark foreground on a light background scans best. If you brand the colours, keep strong contrast and never invert (light pattern on dark) unless you test it on several devices.
Error correction
Higher error correction lets a code survive scratches or a small logo, at the cost of a denser pattern. Medium is a good default; raise it only if you add a logo or expect wear.
Test before you publish
Scan the final image with two or three phones in real lighting before printing a thousand flyers. Our generator runs entirely in your browser, so you can iterate instantly and download a crisp PNG or SVG.
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