This page is designed for users who want practical QR code advice, not just definitions. If you want to build one right away, head back to QR Studio. If you want deeper guidance, read the QR code best practices guide.
What is a QR code?
A QR code is a square barcode that can store website links, plain text, WiFi credentials, phone numbers, calendar events, and other structured data. Smartphone cameras and barcode apps can scan the pattern and convert it into an action.
How much data can a QR code hold?
The answer depends on the kind of data and the error correction level. In practice, shorter QR code content is almost always better. Dense codes may still be valid, but they become harder to scan quickly, especially on older phones or when printed small.
Why does a QR code fail to scan?
- The payload is too long, which makes the code dense.
- The contrast is poor, such as light grey on white.
- The QR code is printed too small for the viewing distance.
- A logo covers too much of the code.
- The quiet zone around the code is missing.
- The print surface is reflective, damaged, or distorted.
What is the best QR code size for print?
A common rule is at least 2 cm by 2 cm for close scanning, but larger placements need larger codes. Posters, signs, and product packaging should be tested from the actual expected scanning distance.
How can I make a QR code easier to scan?
- Keep the content short.
- Use dark modules on a light background.
- Leave a clear white border around the code.
- Use higher error correction only when needed.
- Test on multiple phones before publishing.