QR Code Generator
Generate QR codes instantly for URLs, text, and more. Create scannable codes for marketing, packaging, and digital experiences.
QR Code
Usage
Generate QR codes for URLs, text, contact details, or any data up to ~2,000 characters. The QR code uses error correction level L (low) which allows for higher data density.
Direct image URL:
https://www.quantcdn.io/fn/47be0eb3-bba7-4e47-9cdd-e1e6b38a1917?q=YOUR_TEXT
What is a QR code?
A QR (Quick Response) code is a two-dimensional barcode that stores information in a grid of black and white squares. Originally developed in 1994 by Denso Wave for tracking automotive parts, QR codes have become ubiquitous for linking physical objects to digital content.
Unlike traditional barcodes that store data in one dimension, QR codes encode data both horizontally and vertically, allowing them to hold significantly more information -up to 4,296 alphanumeric characters or 7,089 numeric digits.
How QR codes work
QR codes consist of several components:
Finder patterns - The three large squares in the corners help scanners locate and orient the code regardless of viewing angle.
Alignment patterns - Smaller squares that help correct for distortion when scanning at an angle or on curved surfaces.
Timing patterns - Alternating black and white modules that help the scanner determine the grid size.
Data and error correction - The remaining area encodes the actual data along with error correction information.
Error correction levels
QR codes include redundant data that allows them to remain readable even when partially damaged or obscured:
| Level | Recovery Capacity | Use Case |
|---|---|---|
| L (Low) | ~7% | Clean environments, maximum data |
| M (Medium) | ~15% | General purpose, good balance |
| Q (Quartile) | ~25% | Industrial use, moderate damage expected |
| H (High) | ~30% | Harsh environments, logos overlaid |
Higher error correction means less data capacity but more resilience. Level M is suitable for most applications.
Common uses
Marketing and advertising - Link print materials to websites, landing pages, or promotional content. Track campaign effectiveness by using unique URLs.
Product packaging - Provide detailed product information, instructions, or authenticity verification without cluttering the label.
Payments - Mobile payment systems use QR codes to encode payment details. Scan to pay is standard in many countries.
WiFi sharing - Encode network credentials so guests can connect by scanning rather than typing complex passwords.
Contact information - vCard QR codes let people add your contact details to their phone with a single scan.
Event tickets - Encode ticket information for quick validation at entry points.
Restaurant menus - Link to digital menus, reducing printing costs and enabling real-time updates.
QR code best practices
Size matters - QR codes should be at least 2cm × 2cm for reliable scanning. For distance scanning (posters, billboards), increase size proportionally -roughly 10:1 ratio of scanning distance to code size.
Contrast is essential - Dark modules on a light background works best. Avoid low-contrast colour combinations or busy backgrounds.
Quiet zone - Maintain white space around the code (at least 4 modules wide) to help scanners identify the code boundaries.
Test before printing - Always test QR codes with multiple devices and scanning apps before committing to print.
Use URL shorteners wisely - Shorter URLs create simpler, more reliable QR codes. But ensure your shortener will remain operational -broken QR codes in print are permanent.
Consider accessibility - QR codes are inaccessible to users with visual impairments. Always provide alternative access methods.
QR codes vs barcodes
| Feature | QR Code | Barcode |
|---|---|---|
| Data capacity | Up to 4,296 characters | Up to 43 characters |
| Dimensions | 2D (horizontal + vertical) | 1D (horizontal only) |
| Error correction | Yes (7-30%) | No |
| Scan angle | Any direction | Must align with bars |
| Size efficiency | Higher density | Lower density |
How this tool works
Enter text, a URL, or other content to generate a QR code instantly. The code is generated at the edge via a QuantCDN Edge Function and can be downloaded for use in print or digital materials.