DENSO WAVE · History
https://www.qrcode.com/en/history/
Release in 1994, original design needs and position patterns.

DENSO WAVE · Error correction
https://www.qrcode.com/en/about/error_correction.html
Four correction levels, measured relative to total codewords; eight bits per codeword.

DENSO WAVE · Dirt and damage
https://www.qrcode.com/en/about/featurePage/featurePage4.html
Actual dirt and damage matter; restoration is not an arbitrary-coverage guarantee.

DENSO WAVE · Quiet zone
https://www.qrcode.com/en/howto/code.html
A four-module quiet zone on each side of an ordinary QR code.

DENSO WAVE · Module size
https://www.qrcode.com/en/howto/cell.html
Module size, reader capability and print quality.

DENSO WAVE · FAQ
https://www.qrcode.com/en/faq.html
Design alterations, imaging limits and trademark information; no common revision date stated.

Correction percentages refer to total codewords, not a guarantee about arbitrary covered surface area. This example does not generate or test a QR code. QR Code is a registered trademark of DENSO WAVE INCORPORATED.

Checked 2026-10-02. Undated pages are not assigned an invented revision year.