Phiên bản mã QR 21 (101×101)
QR version 21 is 101×101 modules: up to 2,232 digits, 1,352 alphanumeric, 929 bytes or 572 kanji at level L; 403 bytes at H.
Version 21 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% | 2232 | 1352 | 929 | 572 |
| M | ~15% | 1708 | 1035 | 711 | 438 |
| Q | ~25% | 1224 | 742 | 509 | 314 |
| H | ~30% | 969 | 587 | 403 | 248 |
Codewords and error-correction blocks
The symbol carries 1156 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 | 932 | 224 | 4 × (144, 116, 28) + 4 × (145, 117, 28) |
| M | 714 | 442 | 17 × (68, 42, 26) |
| Q | 512 | 644 | 17 × (50, 22, 28) + 6 × (51, 23, 28) |
| H | 406 | 750 | 19 × (46, 16, 30) + 6 × (47, 17, 30) |
Symbol structure
- Mô-đun
- 101 × 101
- Data modules (codeword bits + remainder bits)
- 9252
- Remainder bits
- 4
- Alignment patterns
- 22 (centre rows/columns 6, 28, 50, 72, 94)
- Version information blocks
- Yes (2 × 18 bits)