二维码版本 2 (25×25)
QR version 2 is 25×25 modules: up to 77 digits, 47 alphanumeric, 32 bytes or 20 kanji at level L; 14 bytes at H.
Version 2 data capacity
Maximum characters in a single encoding mode, per error-correction level (ISO/IEC 18004:2015, Table 7). Mixed-mode data and ECI headers reduce these limits.
| EC level | Recovers | 数字 | 字母数字 | 字节 | 汉字 |
|---|---|---|---|---|---|
| L | ~7% | 77 | 47 | 32 | 20 |
| M | ~15% | 63 | 38 | 26 | 16 |
| Q | ~25% | 48 | 29 | 20 | 12 |
| H | ~30% | 34 | 20 | 14 | 8 |
Codewords and error-correction blocks
The symbol carries 44 codewords in total, split between data and Reed-Solomon error correction (ISO/IEC 18004:2015, Table 9).
| EC level | Data codewords | EC codewords | Blocks (count × total, data, EC codewords) |
|---|---|---|---|
| L | 34 | 10 | 1 × (44, 34, 10) |
| M | 28 | 16 | 1 × (44, 28, 16) |
| Q | 22 | 22 | 1 × (44, 22, 22) |
| H | 16 | 28 | 1 × (44, 16, 28) |
Symbol structure
- 模块
- 25 × 25
- Data modules (codeword bits + remainder bits)
- 359
- Remainder bits
- 7
- Alignment patterns
- 1 (centre rows/columns 6, 18)
- Version information blocks
- No (versions 7–40 only)