QR Code Generator
Generate QR codes for URLs, WiFi, vCards, and more — download as PNG or SVG.
💡 Add your logo to the center after downloading using a design tool like Canva or Figma.
What Are QR Codes and How Do They Work?
QR (Quick Response) codes were invented by Denso Wave in 1994 for tracking automotive parts in manufacturing. Unlike traditional barcodes that store data in one dimension, QR codes use a two-dimensional grid of black and white squares to encode data in both horizontal and vertical directions. This allows them to store significantly more information — up to 4,296 alphanumeric characters or 7,089 numeric digits in a single code.
QR codes include built-in error correction using Reed-Solomon codes, meaning they can still be read even when partially damaged or obscured. The three large squares in the corners (finder patterns) help scanners quickly locate and orient the code regardless of viewing angle. The smaller alignment pattern helps with perspective correction.
QR Code Data Types
QR codes can encode various data types using standardized formats. URL encoding is the most common — scanning opens a web page. WiFi codes use a special format (WIFI:T:WPA;S:NetworkName;P:Password;;) that lets smartphones connect automatically. vCard format encodes contact information (name, phone, email) that can be saved directly to a phone's contacts. Email, phone, and SMS types use their respective URI schemes (mailto:, tel:, sms:).
Error Correction Levels
QR codes offer four error correction levels: L (7% recovery), M (15%), Q (25%), and H (30%). Higher correction means more data redundancy, making the code larger but more resilient. Level H is used when codes might be partially covered — such as when a logo is placed in the center. Level L produces the smallest codes for clean, controlled environments like digital screens.
QR Codes in Marketing and Business
QR codes have become ubiquitous in marketing since the COVID-19 pandemic accelerated contactless adoption. Restaurants use them for digital menus, retailers for product information, and event organizers for ticketing. Business cards now include QR codes linking to digital profiles. Packaging uses them for authenticity verification and detailed product information. Real estate listings include QR codes linking to virtual tours.
QR Code Design Best Practices
Every QR code needs a "quiet zone" — white space around the code at least 4 modules wide. Without it, scanners struggle to identify the code boundary. Minimum recommended size is 2cm × 2cm for close-range scanning, larger for posters and billboards. High contrast between foreground and background is essential — dark modules on light backgrounds work best. Colored QR codes work if contrast is maintained, but avoid light colors for modules.
Mobile QR Scanning
Since iOS 11 (2017) and Android 9 (2018), smartphone cameras have built-in QR code scanning — no separate app is needed. This has removed the largest adoption barrier. Simply pointing the camera at a QR code triggers automatic detection and action. Google Lens and Samsung's Bixby Vision also provide scanning capabilities with additional context about the scanned content.