About QR Code Error Correction Limit Testing
QR Code EC Tester is a free online tool that lets you visually check the limits of the error correction feature of QR codes. When embedding a logo into a QR code or creating a design QR code, you can verify in advance how much you can hide while keeping the code readable.
Comparison of Error Correction Levels
| Level | Recovery Capacity | Use Case |
|---|---|---|
| L | About 7% | When maximizing data capacity. Use in clean environments. |
| M | About 15% | Standard use. The most commonly used level for general QR code generation. |
| Q | About 25% | Somewhat harsh environments. Also supports embedding small logos. |
| H | About 30% | Logo embedding and harsh printing environments. Ideal for design QR codes. |
Use Cases
Ideal for designers who want to place a logo-embedded QR code on business cards or posters, quality control staff who want to verify QR code robustness, and engineers or students who want to understand how error correction works. The center block mask simulates logo placement, while the random scatter mask simulates real-world soiling or damage.