Micro QR과 rMQR: 표준 QR의 소형 대안
When standard QR codes are too large: Micro QR (M1-M4) and Rectangular Micro QR (rMQR) variants for space-constrained applications.
Micro QR and rMQR: Compact Alternatives to Standard QR
When space is extremely limited, standard QR codes may be too large. Two compact variants — Micro QR and Rectangular Micro QR (rMQR) — provide alternatives for constrained applications.
Micro QR Code
Micro QR codes have a single finder pattern instead of three, dramatically reducing overhead for small data payloads. Four versions exist:
| Version | Modules | Max Numeric (EC-L) | Max Byte (EC-L) |
|---|---|---|---|
| M1 | 11x11 | 5 | — |
| M2 | 13x13 | 10 | 6 |
| M3 | 15x15 | 23 | 14 |
| M4 | 17x17 | 35 | 21 |
Key differences from standard QR: - One finder pattern (top-left only) instead of three - Reduced error correction options (M1: detection only; M2: L/M; M3/M4: L/M/Q) - No ECI mode or structured append - Smaller quiet zone requirement (2 modules vs 4)
Rectangular Micro QR (rMQR)
Defined in ISO/IEC 23941:2022, rMQR codes use a rectangular shape optimised for narrow label spaces like PCB edges, cable tags, and medical tubing. Key features:
- Rectangular form factor (e.g., 7x43, 9x77 modules)
- One finder pattern plus one finder sub-pattern for detection
- 32 version sizes (R7x43 through R17x139)
- Error correction levels M and H only
- Supports Numeric, Alphanumeric, Byte, and Kanji modes
When to Use Compact Variants
Micro QR is ideal for: - Small component labels (electronics, PCBs) - Short numeric identifiers (5-35 digits) - Space-constrained packaging where standard QR is too large
rMQR is ideal for: - Narrow spaces: cable labels, tubing, ribbon - Industrial environments requiring rectangular labels - Applications where height is limited but width is available
Scanner Compatibility
Not all QR code scanners support Micro QR or rMQR. Before deploying:
- Most smartphone cameras do not natively read Micro QR
- Dedicated industrial scanners often support Micro QR
- rMQR support is still limited (requires scanners updated to ISO 23941)
- Always verify with your target scanning hardware
Comparison
| Feature | Standard QR | Micro QR | rMQR |
|---|---|---|---|
| Shape | Square | Square | Rectangle |
| Finder patterns | 3 | 1 | 1 + sub |
| Max capacity | 7,089 numeric | 35 numeric | ~361 numeric |
| EC levels | L/M/Q/H | Varies | M/H |
| Smartphone support | Universal | Limited | Rare |
Key Takeaways
- Micro QR uses one finder pattern for small square codes (up to 35 numeric chars)
- rMQR provides rectangular codes for narrow spaces like cable labels
- Both have reduced capacity and error correction compared to standard QR
- Scanner compatibility is limited — always test with your target devices
- For consumer-facing applications, standard QR codes remain the safe choice