|1||21 x 21||L||41||25||17|
|2||25 X 25||L||77||47||32|
|3||29 x 29||L||127||77||53|
|Error Correction (ECC): L 7%, M 15%, Q 25%, H 30%|
There are 40 versions of the QR Code range, which can encode 10 alphanumeric (version 1) to about 4,000 alphanumeric (version 40).
Besides QR Code versions, there's another parameter: Error Correction Level (ECC). ECC affects your QR Code quality. Basically, all QR Codes are created with built-in error correction algorithms (Reed Solomon error correction method) that allow them to be scanned even if a part of it is broken. We recommend using level H (30%) or Q (25%) on any printed labels.
Scan2D uses multiple combinations of QR Code versions and ECC to create the most effective code. The left side image above shows a 20 letter URL that we normally use. The right side is a demo QR Code up to 47 letters (maximum length is used to create a quick response from most mobile apps).