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What Is a QR Code?
A QR code (Quick Response code) is a two-dimensional barcode that stores information in a matrix of black and white squares. Originally invented in 1994 by Denso Wave for tracking automotive parts, QR codes have become ubiquitous in marketing, payments, authentication, and everyday communication. They can be scanned by any smartphone camera to instantly access URLs, contact information, Wi-Fi credentials, and more.
How Does a QR Code Work?
QR codes encode data using a pattern of dark and light modules arranged in a square grid. The code includes positioning patterns (the large squares in three corners) that help scanners orient the code, timing patterns that establish the grid coordinates, and format information that specifies the error correction level. The data itself is encoded using one of several modes (numeric, alphanumeric, byte, or kanji) depending on the content. Error correction using Reed-Solomon codes allows the QR code to remain readable even if up to 30% of the code is damaged or obscured.
Error Correction Levels Explained
Level L (Low)
Recovers up to 7% of data. Produces the smallest QR code. Best for clean environments where the code will not be damaged.
Level M (Medium)
Recovers up to 15% of data. The default level, offering a good balance between size and reliability.
Level Q (Quartile)
Recovers up to 25% of data. Good for printed materials that may get partially damaged or dirty.
Level H (High)
Recovers up to 30% of data. Best for harsh environments or when embedding a logo over part of the code.
Common Use Cases for QR Codes
Website Links
Direct users to a URL by scanning. Perfect for marketing materials, business cards, and product packaging.
WiFi Access
Share WiFi credentials with guests. The QR code auto-connects their device without typing the password.
Contact Cards
Encode vCard data so people can save your contact info to their phone with a single scan.
Email Composition
Pre-fill email recipient, subject, and body. Great for customer support and feedback forms.
Phone Calls
Let users call a number with one scan. Useful for business signage and customer service.
Plain Text
Encode any text message, serial numbers, product codes, or instructions into a scannable format.
Why Use QRGen?
- ✓Completely Free - No limits, no watermarks, no hidden costs. Generate unlimited QR codes.
- ✓Privacy First - Everything runs in your browser. Your data never touches a server.
- ✓Multiple Formats - Download as PNG for web or SVG for print. Copy directly to clipboard.
- ✓Full Customization - Custom colors, sizes up to 1024px, adjustable margins, and four error correction levels.
- ✓6 Data Types - URL, plain text, email, phone, WiFi, and vCard supported out of the box.