QR Code Generator

A QR code is a grid of black and white squares called modules, arranged around three large corner markers that let a scanner find and orient the pattern regardless of angle. The content you type is converted into binary data, split into blocks, and protected with Reed-Solomon error correction before being mapped onto the grid. The encoder automatically picks the most compact mode it can — numeric for digits only, alphanumeric for a limited character set, or byte mode for anything else including letters, symbols and unicode text — which is why a string of digits produces a noticeably sparser code than the same length of mixed text.

This generator works for any content: a note to yourself, a product code, event details, a short message you want someone to scan rather than type, or a link when you don't need the phone-specific behavior that the dedicated URL, WiFi, email or phone generators provide. Because the data is stored as literal text, the scanning device decides what to do with it — most phones will offer to open recognizable URLs automatically but will just display anything else as plain text.

Error correction level trades data density for damage tolerance: level L packs in the most data but tolerates the least damage, while level H can survive roughly 30% of the code being obscured or scratched at the cost of a denser pattern. Whatever level you choose, keep a clean quiet zone (blank margin) around the code, use dark modules on a light background for reliable contrast, and do a test scan at the final print size before distributing it widely.