ESTExact Size Tool
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Image to ICO Free

Build a Windows .ico file containing every common icon size at once.

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Free, and staying free. No account, no daily limit, no watermark, nothing uploaded. Keeping it up does cost something (the domain, and the AI that reads your notification) and a contribution goes there. Passing the site to someone filling the same form helps just as much, and costs nothing at all.
Help with running costs
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How to use it

  1. Choose your image, or drag it onto the page.
  2. Drag the picture to position it, and pinch or scroll to zoom.
  3. Set the options on the right. The result updates as you change them.
  4. Check the result, then press Download.

About Image to ICO

Windows shortcuts, desktop applications and older browsers expect a .ico file, which is unusual in that a single file holds several sizes at once so the system can pick the right one. This builds that file from one square image, packing every common icon size inside.

Good to know

  • Start from a square image of at least 256 pixels so the largest size inside the file is sharp.
  • ICO holds multiple resolutions in one file. That is exactly why Windows prefers it over a single PNG.
  • For a modern website, the PNG set from Favicon Generator matters more than the .ico.

Questions

Which sizes are included?

The common icon sizes are packed into the one file, so Windows and older browsers each find the resolution they want.

Do I still need PNG favicons?

Yes, for current browsers and mobile home screens. Favicon Generator produces those.

Can I use a non-square image?

It will be fitted to a square, which may add padding. Crop to a square first for the best result.

Does transparency work?

Yes. Start from a transparent PNG and the icon keeps its transparent background.

Is my file uploaded anywhere?

No. Everything runs inside your browser using your own device. Your file never leaves it, and we never see or store it. You can even disconnect from the internet and the tool still works.

Is it really free?

Yes. No account, no daily limit, no watermark on your files. The site is paid for by ads.

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