1. 01In image mode, drop in, choose or paste a QR code image with Ctrl+V.
2. 02Wait for the local decode and read the raw text and its content type.
3. 03Camera mode needs camera permission over HTTPS or on localhost; point the QR code at the viewfinder.
4. 04Once decoding succeeds the scanner stops; copy the result, or click “Open link” yourself for an HTTP(S) link.

• The route registers PNG, JPG, JPEG, WebP and BMP; the in-page dropzone uses image/*, and whether other formats decode depends on the browser's actual ability.
• Camera scanning requires a secure context; on a non-HTTPS, non-localhost origin the browser blocks camera access.
• The camera prefers the rear one and can switch to the front; a missing device, a refused permission or a failed switch produces an error message.
• The content type is only a prefix classification of the string; it does not verify link safety, the truth of a WiFi password or the ownership of a phone number.
• What it does not do: it does not read 1D barcodes, does not join WiFi, does not dial or send messages, and does not visit a scanned URL automatically.

Images and camera frames are processed locally in the browser by qr-scanner and are never uploaded; the scanner is destroyed when you leave the tool and the preview object URL is released as well.