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How QR Codes Work
A practical explanation of QR data, error correction, quiet zones, sizing and scanning.
What is a QR code?
A QR code is a two-dimensional symbol that stores information in a pattern of dark and light modules. A phone camera or QR reader interprets that pattern and turns it back into text or a link.
Why error correction matters
QR codes include error-correction data so a scanner can often recover information when part of the symbol is dirty, damaged or covered. Higher correction can improve resilience, but it can also make a code denser.
The quiet zone
The blank margin around a QR code is important. Keep surrounding graphics and text away from the symbol so scanners can identify its boundary.
Tip: Use our free tools to test your code, then scan the final version before sharing or printing it.