About FaviconGen
Your images never leave your device.
Your image never leaves your device
Every generator on FaviconGen runs entirely in your browser. There is no backend, no server, and no upload: when you upload a logo, it is decoded by JavaScript and rasterized on a canvas running locally on your machine. The resulting icons, the .ico file, and the manifest are all built in memory and handed back to you. Nothing is ever transmitted over the network.
That matters because a favicon is your brand identity. Keeping the source artwork on-device is the privacy moat that upload-based incumbents cannot offer.
How it works
Your image is drawn to an HTML canvas at each target pixel size using the browser's high-quality image-smoothing scaler. The multi-resolution.icois written by a pure-JavaScript encoder (an ICONDIR header plus one ICONDIRENTRY per size, each wrapping a PNG blob). The zip is assembled with JSZip. There is no WebAssembly and no server round-trip — just pure JavaScript, enforced by a strict connect-src 'self' Content-Security-Policy.
Limits & the Pro tier
The free tier generates a complete icon package from a single image, entirely on-device. Batch generation from multiple logos and direct vector (SVG) output will be part of a future Pro tier — still with no upload. For now, upload one square image and generate away.
The site is also installable as a PWA and works offline after the first load.