二维码版本 4 (33×33)
QR version 4 is 33×33 modules: up to 187 digits, 114 alphanumeric, 78 bytes or 48 kanji at level L; 34 bytes at H.
Version 4 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% | 187 | 114 | 78 | 48 |
| M | ~15% | 149 | 90 | 62 | 38 |
| Q | ~25% | 111 | 67 | 46 | 28 |
| H | ~30% | 82 | 50 | 34 | 21 |
Codewords and error-correction blocks
The symbol carries 100 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 | 80 | 20 | 1 × (100, 80, 20) |
| M | 64 | 36 | 2 × (50, 32, 18) |
| Q | 48 | 52 | 2 × (50, 24, 26) |
| H | 36 | 64 | 4 × (25, 9, 16) |
Symbol structure
- 模块
- 33 × 33
- Data modules (codeword bits + remainder bits)
- 807
- Remainder bits
- 7
- Alignment patterns
- 1 (centre rows/columns 6, 26)
- Version information blocks
- No (versions 7–40 only)