Which sizes does the .ico contain?

The favicon preset holds 16, 32 and 48 px icons. The Windows preset holds 16, 24, 32, 48, 64, 128 and 256 px. You can also export a single size.

What size should my PNG be?

Use a square PNG of at least 256 × 256 px. Smaller images are enlarged for the bigger icon sizes and look soft.

Yes. Each icon is stored as a 32-bit PNG inside the .ico, including its alpha channel.

Contain fits the whole image and leaves transparent bars, Cover fills the square and crops the overflow, and Stretch distorts the image to fill it.

For a complete set with Apple touch icons, a web manifest and the HTML tags, use the Favicon Generator.

No. PNG files are decoded and converted in your browser, and nothing is sent to a server.

Convert PNG to ICO online for free. Build a multi-size .ico for favicons and Windows icons with transparency kept, entirely in your browser.

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Packs a PNG into a multi-size .ico for favicons and Windows icons. Use a square image of at least 256 × 256 px for the sharpest result.

Files are converted in this browser and are never uploaded. Up to 20 files, 50 MB each and 256 MB per batch.