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QR Code Generator

Generate QR codes for links, text, WiFi access and vCard contacts — with custom colors, adjustable size and PNG download. The encoder (Reed-Solomon and all) is written from scratch and runs entirely in your browser.

Text / URL WiFi vCard
Error correction L — 7% M — 15% Q — 25%

About this tool

A complete QR encoder implemented from scratch — byte-mode segmentation, automatic version selection (1–10, up to 271 bytes at level M), Reed-Solomon error-correction codewords computed over GF(256), block interleaving, and mask selection by the four penalty rules from the QR specification. Nothing is fetched from an API: the black-and-white matrix is computed in the page and drawn to a canvas with a proper 4-module quiet zone.

Low-contrast or inverted color choices can make codes unscannable — keep the foreground much darker than the background. WiFi passwords, contact details and URLs never leave your browser: no server, no upload, no tracking of tool inputs.

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Found this useful? 113 free, browser-only tools by Yuvrajsinh Jadav — an engineer who ships production AI systems. No account, nothing sent anywhere.
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