Phiên bản mã QR 1 (21×21)
QR version 1 is 21×21 modules: up to 41 digits, 25 alphanumeric, 17 bytes or 10 kanji at level L; 7 bytes at H.
Version 1 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 | Số | Chữ và số | Byte | Kanji |
|---|---|---|---|---|---|
| L | ~7% | 41 | 25 | 17 | 10 |
| M | ~15% | 34 | 20 | 14 | 8 |
| Q | ~25% | 27 | 16 | 11 | 7 |
| H | ~30% | 17 | 10 | 7 | 4 |
Codewords and error-correction blocks
The symbol carries 26 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 | 19 | 7 | 1 × (26, 19, 7) |
| M | 16 | 10 | 1 × (26, 16, 10) |
| Q | 13 | 13 | 1 × (26, 13, 13) |
| H | 9 | 17 | 1 × (26, 9, 17) |
Symbol structure
- Mô-đun
- 21 × 21
- Data modules (codeword bits + remainder bits)
- 208
- Remainder bits
- 0
- Alignment patterns
- 0
- Version information blocks
- No (versions 7–40 only)