QR Code Generator
Generate custom QR codes for text, URLs, WiFi, business cards, email, SMS and more
Select QR Code Type
Custom Settings
Recommendation: Square image, transparent background, max 20% of QR code size
Preview
QR code will be displayed here
About QR Code Generator
What is a QR Code?
QR Code '('Quick Response Code')' is a two-dimensional barcode that can store various types of information such as text, URLs, contact information, WiFi credentials, etc. Users can quickly read it through mobile phone cameras or scanning apps.
QR codes are defined by the ISO/IEC 18004 international standard. Depending on the version and error correction level, the content capacity varies.
Supported QR Code Types
Error Correction
QR codes use Reed-Solomon error correction algorithm, maintaining readability even when partially obscured or damaged.
| Level | Error Tolerance | Recommended Scenario |
|---|---|---|
| L | ~7% | Short content, clean environment |
| M | ~15% | General default choice |
| Q | ~25% | Outdoor, printed materials |
| H | ~30% | Need to add logo or may be obscured |
Best Practices
Maintain High Contrast
Dark foreground + light background is easier to scan, avoid low contrast color schemes.
Ensure Sufficient Size
Print: at least 2×2cm recommended; Screen display: at least 150×150px recommended.
Leave Quiet Zone
Recommend leaving sufficient white space margin around QR code to improve recognition rate.
Control Logo Proportion
Logo should not exceed 20% of the overall QR code, and choose higher error correction level.
Common Use Cases
Marketing
Used on product packaging, posters, business cards for quick access to websites/event pages.
Payment
Mobile payment, collection codes, cryptocurrency address sharing, etc.
Authentication & Login
Two-factor authentication '('2FA')' binding, device login, access control, etc.
Ticketing & Entry
Event tickets, boarding passes, entry verification for quick ticket checking.
Inventory & Asset Management
Item tracking, equipment labels, quick access to asset details.
Education & Material Distribution
Course material links, attendance, interactive learning content distribution.
Technical References & Resources
Official website of QR code inventor, including technical documentation and specifications.
Official specification for QR code symbol structure, encoding and error correction.
Overview of QR code history, technology and applications.
Reference for vCard data format used in vCard QR codes.
Reference documentation for WiFi credential QR code encoding format.