Remove a color from an ICO.

Drop the ICO, click the color in the preview or type its hex, widen the tolerance to catch its shades and download. The matched pixels become transparent.

Yes, any flat color: a blue box, a brand backdrop, a green key. Select it and raise the tolerance until its shades are all in the mask.

One per pass. Download, drop the PNG back in and pick the next; PNG loses nothing between passes.

Click it in the preview, or type the hex if you know it. Preview mask shows exactly which pixels will go.

5 to 10 percent for a flat color; 15 to 25 where it varies, as in a screenshot; 30 and up for a wide range. Start low and raise it.

Drop the ICO, then pick the color to remove: click it in the preview or type its hex. Tolerance widens the match to nearby shades; 0 takes the exact color only and 10 to 20 catches anti-aliasing and off-whites. The result is a PNG with real alpha.

Turn on outer pixels only. Then only matching pixels connected to the edges go, so a white letter or highlight inside the icon stays. Preview mask shows exactly which pixels will be cleared before you download.

The largest frame of the ICO. A browser's canvas writes PNG, which every editor opens; to get an ICO back, pack the PNG with the PNG to ICO tool at the sizes you need.

No. The ICO is read and its frames decoded by JavaScript on your device; the page makes no request with your file. Load it, go offline and it still works.

No. The "Remove a color from an ICO" tool is free and opens without a sign-in, an account or an install.

Up to 100 MB per file, the limit the tool states under its drop area. A larger file is refused with a plain message instead of being decoded.

The edit is written as a PNG because PNG stores every pixel exactly, with a full alpha channel, so the result can be edited again without a second round of loss.

No. The browser decodes the image and the tool writes a new file from its pixels, so camera EXIF, GPS position and text chunks in the original are not copied into the result. Keep the original file if you need them.

No. The result has the same width and height in pixels as the source.

Closest to the "Remove a color from an ICO" tool: ICO background remover, ICO transparency creator, Remove a color from an image, Remove the white background from an ICO. Each opens on its own page, free and in the browser.

The "Remove a color from an ICO" tool is one of 37 in its group. The group's page, /tools/ico, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.