Core Concepts
QR Code Version
In QR code terms, "version" refers to the physical size of the grid, not a software release — versions run from 1 (21×21 modules) to 40 (177×177 modules), with each step up adding 4 modules per side and more data capacity.
A generator picks the version automatically based on how much content needs to be encoded and which error correction level is set — you never choose it manually. A short URL might only need version 3 or 4; a long vCard with several fields could push into the teens or higher.
Higher versions hold more data but produce a visually denser, more detailed pattern, which makes them harder to scan reliably at small print sizes — one more reason to keep encoded content (like URLs) as short as practical.
Advertisement300×250