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🖼️ PNG → ICO

PNG to ICO Converter

Convert any PNG image to a multi-size .ico favicon file instantly. Supports transparency. 10 sizes from 16×16 to 512×512 packed into one file.

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Why PNG is ideal for favicon source images

PNG is the best format for creating favicons because it supports full alpha transparency. This means your icon background can be fully transparent, allowing it to adapt perfectly to dark-mode tabs, light browsers, and custom browser themes — without a visible background rectangle.

How PNG to ICO conversion works

Our tool loads your PNG using the browser's File API, draws it onto HTML5 Canvas elements at each of the 10 required sizes, then encodes the pixel data into standards-compliant ICO binary format. Sizes below 256px are stored as 32bpp BMP DIBs (preserving transparency through the alpha channel); sizes 256px and above are embedded as PNG streams — the approach used by Windows Vista+ and modern browsers.

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Frequently Asked Questions

Yes. The tool preserves full RGBA transparency throughout the conversion. The 32bpp BMP DIB format used for smaller sizes includes an explicit alpha channel, and PNG streams support full transparency natively.
Absolutely. Upload your logo PNG (preferably square, 512×512 px or larger), and the tool will automatically generate all required favicon sizes. For best results, use a simplified version of your logo designed to be legible at 16px.
100% free and completely private. All conversion happens locally in your browser — your PNG file is never uploaded to any server. No account required, no watermarks added.