QR Code Generator
The QR Code Generator creates QR codes from text, URLs, phone numbers, or any string input. QR (Quick Response) codes are two-dimensional barcodes that can store more data than traditional barcodes. They are widely used for sharing URLs, WiFi credentials, contact information, payment links, and product tracking. This generator creates high-quality QR codes that can be scanned by any smartphone camera. Simply enter your text or URL, and the generator produces a downloadable QR code image.
Formula
QR Code structure: - Finder patterns: 3 corner squares - Alignment patterns: for larger codes - Timing patterns: alternating modules - Data: encoded in modules (black/white) - Error correction: L (7%), M (15%), Q (25%), H (30%) Capacity: up to 7,089 numeric or 4,296 alphanumeric chars
Example
Input: https://calczy.com Output: QR code image (scannable) Input: WiFi network credentials Output: QR code that auto-connects when scanned Input: Contact card (vCard) Output: QR code that saves contact when scanned
How to Use
- Enter your text, URL, or data into the input field
- Select error correction level (L, M, Q, or H)
- Click generate to create the QR code
- Download the QR code image (PNG or SVG)
- Test with a smartphone scanner before deploying
Frequently Asked Questions
What can I encode in a QR code?
QR codes can encode URLs, text, phone numbers, SMS messages, email addresses, WiFi credentials, contact information (vCard), calendar events, and geographic coordinates. The maximum capacity is 7,089 numeric characters or 4,296 alphanumeric characters.
What error correction level should I use?
Level L (7% recovery) for clean environments. Level M (15%) for general use. Level Q (25%) for outdoor or potentially damaged codes. Level H (30%) for industrial use or when the code may be partially obscured. Higher error correction reduces data capacity.
How do I scan a QR code?
Most smartphones can scan QR codes using the built-in camera app. Open the camera, point it at the QR code, and a notification will appear with the encoded content. You can also use dedicated QR scanner apps for more features.
Can QR codes be customized with colors or logos?
Yes, QR codes can include colors, logos, and designs while remaining scannable. However, high contrast (black on white) is recommended for maximum compatibility. Custom designs should be tested with multiple scanners before deployment.
Do QR codes expire?
No. QR codes themselves do not expire. However, if the QR code contains a URL, the destination page can be removed or changed. Dynamic QR codes (which redirect through a service) can be updated or expire, but static QR codes are permanent.