QR Code Generator

A QR code isn't just a black-and-white square — it's a carefully structured error-correcting barcode. Underneath the pattern is real Reed-Solomon error correction (the same family of math used in CDs and satellite links), a chosen "version" (grid size) sized to fit the data, and a mask pattern selected to avoid patterns that confuse scanners. This tool implements every layer of that spec directly — the bit-stream encoding, the Galois-field arithmetic behind the error correction, the finder and timing patterns, and the mask-penalty scoring used to pick the cleanest-looking result — rather than wrapping an existing library.

Eleven content types cover the situations people actually scan a QR code for: a URL, free-form text, a pre-filled email, a phone number that dials on scan, an SMS with a pre-filled message, a Wi-Fi network login, a WhatsApp chat with a message already typed in, a direct link to a business's Google Review box, a contact card (vCard) that scans straight into a phone's address book, a calendar event that adds itself to the scanner's calendar, and a GPS location that opens straight in a maps app. Each is encoded using the exact URI or payload format phones already know how to parse.

A center logo is the single most-requested QR feature, and it comes with a real constraint: cover too much of the code and it stops scanning. Uploading a logo here automatically locks error correction to level H — the QR spec's most damage-tolerant setting, built to survive roughly 30% obstruction — and caps the logo at a size that stays safely inside that budget, with a clean rounded backdrop behind it so the logo reads clearly against any background color. The same safe-sizing logic applies across every export format, so the PNG, SVG, and PDF all stay scannable.

Color goes beyond a flat foreground now too — solid, linear gradient, or radial gradient, with a live low-contrast warning so a stylish palette doesn't accidentally break scannability. Module and eye shape are stylable independently: dots or rounded connected shapes for the data pattern, and square, rounded, or circular styling for the three big corner "eyes" — every combination is verified against a real decoder (not just eyeballed), including the dot-radius math needed to keep circular modules dense enough to scan reliably rather than just looking nice.

Every export downloads in whatever resolution you need: quick presets from 512 to 2048px, a custom pixel size up to 4096px, a true vector SVG that stays sharp at any print size, or a print-ready PDF sized for flyers and packaging. A one-click "copy image" button pastes the code straight into another app with no download step at all. Everything — encoding, rendering, logo compositing, export — happens locally in your browser; the content you're encoding never touches a server.