Test a QR code before printing or publishing

Test QR code scannability before you print

Use the checker as a QR tester before committing important artwork to print. It attempts a real local decode and reports observations the browser can actually measure, including contrast, quiet-zone space, density and image resolution.

After a successful decode you can add the intended printed width and normal scanning distance. The preflight compares that plan with the decoded QR density using the same conservative physical sizing model as the Size Calculator, without turning the result into a score or guarantee.

That is more useful than an unexplained scannability score. A browser cannot guarantee how every physical print, camera, surface, viewing angle or lighting condition will behave.

For important jobs, test the final exported artwork and then scan a physical proof with more than one real device.

This is not a virus scanner

QR code checker can also mean checking whether a destination is malicious. That is not what this tool claims to do.

The Checker evaluates the QR image and decoded payload. It does not provide malware detection or an external URL-reputation score. If you want to inspect a QR without immediately visiting its destination, use the Scanner, which shows decoded content before navigation.