An exploration of QR code size differences based on letter casing reveals that uppercase URLs generate smaller QR codes due to efficient Alphanumeric mode encoding. The uppercase version uses a 21x21 pixel grid, while lowercase requires a larger 25x25 grid due to Byte mode encoding requirements.

https://shkspr.mobi/blog/2025/02/why-are-qr-codes-with-capital-letters-smaller-than-qr-codes-with-lower-case-letters/

#qrcodes #dataencoding #urloptimization #technicalanalysis #digitalstandards