QR code problems and how to fix them
Short, practical fixes for a QR code that will not scan, has stopped working, looks blurry or sits on a tricky surface.
Start with the problem you are seeing. Each page lists the usual causes in the order worth checking, and what to change on the printed code or the link.
Not scanning on iPhoneFixes for a QR code that the iPhone camera ignores. Not scanning on AndroidFixes for Android phones that will not read a QR code. No usable QR code data foundWhat the 'no usable data' message means and how to fix it. QR code stopped workingWhy a QR code that used to work no longer does, and what to do. QR code too smallThe smallest size a QR code can be and still scan. Blurry or pixelated QR codeWhy a printed QR code looks blurry and how to export a sharp one. Not scanning on a screenWhy a QR code on a monitor, TV or phone screen will not scan. Scans but the page will not loadThe code reads fine but the page does not open. Change a QR code after printingWhether you can change where a printed QR code goes. Do QR codes expire?Whether a QR code can expire, and which kinds can. Spotting a fake QR codeHow to tell whether a QR code has been tampered with or points somewhere unsafe. Dark or colored backgroundWhether a QR code scans on a dark or colored background. Curved or shiny surfaceScanning a QR code on a bottle, mug, laminate or glass. Test a QR code before printingA short checklist to confirm a code works before you print a batch. QR code link too longWhy a long web address makes a QR code hard to scan and how to shorten it. Works on one phone but not anotherWhy a QR code scans on some phones and fails on others.