QR-код

[igor2]

Здесь подробнее про вместимость: http://en.wikipedia.org/wiki/QR_code

The maximum storage capacities occur for 40-L symbols (version 40, error correction level L), and are as follows (where character refers to individual values of the input mode/datatype, as indicated):
Numeric only Max. 7,089 characters (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
Alphanumeric Max. 4,296 characters (0–9, A–Z [upper-case only], space, $, %, *, +, -, ., /,
Binary/byte Max. 2,953 characters (8-bit bytes)
Kanji/Kana Max. 1,817 characters