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Generate QR codes for URLs, text, Wi-Fi, and more. Customize size and colors. Download as PNG or SVG. 100% free, no signup required.
A QR (Quick Response) code is a two-dimensional barcode that stores data like URLs, text, or contact info. It can be scanned by smartphone cameras and can hold up to 4,296 alphanumeric characters.
Formula
Data Capacity = f(version, error correction level, encoding mode) | Max alphanumeric: 4,296 chars at version 40-LVersion = QR code size (1 to 40); higher versions = more modules = more data capacity
Error Correction = L=7%, M=15%, Q=25%, H=30% of data can be restored if damaged
Encoding Mode = Numeric (only 0 to 9), Alphanumeric, Binary, or Kanji: affects density
Worked Example
URL: https://mycalculator.to (26 chars)
Did you know? QR codes were invented in 1994 by Masahiro Hara at Denso Wave for tracking automotive parts. The 'QR' stands for 'Quick Response': they were designed to be decoded at high speed without requiring precise alignment.
Sources
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