What does error correction level mean?

Error correction level determines how well a QR code can still be recognized when partially damaged or obscured. Levels: L (7%), M (15%), Q (25%), H (30%). Higher levels create more complex patterns but offer better resistance to damage. For most scenarios, M level is sufficient.

QR Code Generator

Enter text or URL, generate QR codes with one click and download as images.

Size Error Correction

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QR code will appear here

FAQ

What can QR codes store?
QR codes can store text, URLs, WiFi configurations, electronic business cards (vCard), phone numbers, SMS messages, geographic locations, and more. When scanned, phones automatically recognize the type and perform the corresponding action. The QR codes generated by this tool are standard QR codes that any scanner can recognize.

How do I choose the error correction level?
L level (7%): Suitable for scenarios where the QR code is clear and unobstructed. M level (15%): Recommended for daily use, can tolerate slight obstruction. Q level (25%): Use when the QR code may be partially obstructed. H level (30%): Use when the QR code needs to be printed on curved surfaces or wear-prone areas. Higher levels create denser patterns; M level is recommended as the first choice.

Related guide

UUID, QR Code and Base64: Where Three Generators Stop Telling You They Failed
The UUID page draws real entropy from crypto.getRandomValues, but its count box turns 0 and abc into ten and ignores your format checkboxes until you press Generate again. The QR generator has no error path: ask for more than the error-correction level can hold and it leaves you an invisible canvas that the Download button still exports as a 2,786-byte PNG. The Base64 page trusts your browser's MIME guess, never shows gigabytes, and marks its preview box ready for files it cannot preview. All figures measured by driving the pages.