QR Code Generator

To generate a QR code: 1) Enter your text, URL, or data in the input field, 2) Adjust size and error correction if needed, 3) The QR code generates instantly, 4) Download as PNG or SVG, or copy the image. The tool supports URLs, plain text, WiFi credentials, and more.

QR code capacity depends on the data type and error correction level. Maximum capacities: 7,089 numeric characters, 4,296 alphanumeric characters, 2,953 bytes of binary data, or 1,817 Japanese Kanji characters. Practical limits are often lower for reliable scanning.

Error correction allows QR codes to be read even when partially damaged or obscured. Four levels exist: L (7% recovery), M (15%), Q (25%), and H (30%). Higher levels mean more redundancy but also larger codes. Use H for printed codes that may get damaged.

QR code size depends on scanning distance and content. General guidelines: 2cm (0.8in) minimum for close scanning, 10x scanning distance for optimal size (10cm QR for 1m distance). More data requires larger codes. Test with multiple devices before printing.

Yes, QR codes can be customized with different colors. Ensure sufficient contrast between foreground and background (dark on light works best). Avoid red/green combinations and maintain at least 40% contrast ratio for reliable scanning.

PNG is a raster format with fixed resolution - good for web and specific print sizes. SVG is vector format that scales infinitely without quality loss - ideal for printing at any size. Use SVG for print materials and PNG for digital displays.

WiFi QR codes use the format: WIFI:T:WPA;S:NetworkName;P:Password;; Enter this string or use a WiFi QR generator that creates this format. When scanned, phones can automatically connect to the network.

QR codes themselves aren't malicious, but they can link to harmful URLs. Always preview links before visiting, use QR scanners that show URL previews, and be cautious of QR codes in public places that could be malicious overlays.

Static QR codes (with data encoded directly) last forever - they're just images. Dynamic QR codes (linking to a service) depend on the provider. Printed QR codes last as long as they remain scannable. There's no expiration built into QR technology.

Common scanning issues: 1) Insufficient contrast between colors, 2) QR code too small for distance, 3) Blurry or damaged image, 4) Too much data causing dense pattern, 5) Glare or poor lighting. Try increasing size, using high error correction, and ensuring good contrast.