Why Does a QR Code with a Logo Fail to Scan?

Test the link and a plain code first

Open the destination in a browser. Encode a short, correct address using dark square modules on a light background. Adding a logo cannot fix an unreadable starting version. Example: for a table-menu code, first check that the phone opens the current menu.

A logo is not an error-correction allowance

Utilgo uses error-correction level H when a logo is added. This does not make an arbitrarily large logo safe. Start small; reduce or remove it if scanning fails. Keep the outer corner markers clear.

Allow space around the printed code

Leave a clear margin at least four modules wide on all four sides of the QR symbol. Keep frames and captions outside it. There is no universal centimetre size: content density, printing and scanning distance matter. Do not enlarge a PNG until it blurs; even with SVG output, print a proof at the final size.

Approve the real-world result

Utilgo’s automatic reading check is a useful first test, not a simulation of every phone and printing condition. Test the final output with different phones at the intended distance and lighting. A static code’s content cannot be changed later; if its destination page disappears, scanning the code will not restore that page.

• DENSO WAVE: QR Code
• DENSO WAVE: Error Correction