How do you read a QR code in the Photos app?
Open a clear photo or screenshot containing the complete QR code. When iOS recognizes the code, press and hold it or use the detected-data action, then inspect the link or encoded content before opening anything.
Why does a QR code in a screenshot sometimes fail?
Recognition may fail when the code is blurred, tiny, cropped, distorted, low-contrast, covered by interface elements, or surrounded by too little quiet space. A cleaner crop or higher-resolution image often helps.
How can you improve a saved QR image before scanning it?
Crop away unrelated content without cutting the code, keep all four corners visible, and use the original file rather than a compressed copy when possible. Avoid filters that change the light and dark modules.
Should you open a QR result received in a message?
Treat an unexpected QR image like any other unfamiliar link. Confirm who sent it, preview the destination, and avoid entering credentials or payment details when the request or domain does not match your expectations.