QRix
Generate a genuine .ico file — the format browsers expect at /favicon.ico and Windows expects for application icons.
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An ICO file is a container format, not just an image with a different extension, and that distinction matters: it carries an ICONDIR header describing the icons packed inside it. Plenty of online converters simply rename a PNG and hand it back, which is why those files fail when Windows or a strict browser actually tries to parse them. This tool writes a proper ICO structure — a valid header plus a 256×256 PNG payload, the modern approach every current browser and Windows Vista onward understands. Transparency is preserved, so rounded logos sit cleanly on any background. Start from a square PNG for the best result; non-square sources are scaled to fit 256×256. Serve the finished file at your site root as /favicon.ico.
A real one. It writes a proper ICONDIR header and icon directory entry around a 256×256 PNG payload — the standard modern ICO structure.
Square and at least 256×256; 512×512 is ideal. The output is generated at 256×256, which every modern browser and Windows version handles.
Yes. The PNG payload inside the ICO keeps its full alpha channel, so rounded or irregular logos look correct on any background.
At the root of your site as /favicon.ico. Browsers request that path automatically; you can also reference it with a <link rel="icon"> tag.
PNG-payload ICO files are supported from Windows Vista onward and in all current browsers. Windows XP required BMP-payload icons.
It's free, private and works right in your browser — no signup, no watermark.