Choose an image
Select an image file that contains a QR code.
QR Code Check
Choose an image of a QR code to check whether it can be decoded, and see its basic technical details. Processing happens locally in your browser — nothing is uploaded, and no account is required.
- Free
- Processed locally
- No upload
- No account
Image
Choose an image file that contains a QR code.
Choose an image to check.
About this check
QR Code Check is different from the QR Scanner: the Scanner is for reading and using the content of a QR code. This tool is for examining the code itself. Right now it checks whether an image can be decoded at all and shows a few basic technical details. Further technical checks are planned for a future update.
How QR Code Check works
Review the result
See whether the code could be decoded, along with its version and module count.
Frequently asked questions
How is this different from the QR Scanner?
The fourwww QR Scanner is for reading and using the content of a QR code. QR Code Check is for examining whether a QR code can be decoded, with further technical checks planned for a future update.
What does the module count tell me?
It is the number of modules (the small squares) on each side of the QR code, based on its version. Higher versions hold more data but need a larger printed size to stay easy to scan.
Does a successful decode guarantee the code will always scan well?
No. A successful decode here is a good sign the code is fundamentally readable, but printing, lighting and camera conditions can still affect real-world scanning. More detailed technical checks are planned for a future update.