Favicon loading state opacity.

40 to 50 percent: different enough to notice, not invisible. Swap back to 100 when loading ends; pair it with a spinner if you like.

Export a favicon per state and change the <link rel="icon"> href from JavaScript as the state changes. A few lines, no library needed.

Export 30, 50 and 70 percent and cycle through them with a timer: a breathing icon that says something is in progress.

Yes: with the Page Visibility API, swap to the faded version when the tab loses focus, and back when it returns.

Keep the badge at full strength and fade the icon behind it to 60 percent; the badge then draws the eye.

Mobile browsers show favicons in tab switchers, if at all; the effect counts on desktop tab bars. Test where your readers are.

Solid multiplies every pixel's alpha by the opacity you set. Linear fades from full to your value across the icon in the direction you pick. Radial fades from the centre out, or the edges in, with a radius. On a 16-pixel icon, solid is the one that reads.

Yes. The new opacity multiplies the alpha the icon already has, so transparent areas stay transparent and anti-aliased edges stay soft.

The largest frame of the ICO is processed and the result is a PNG with an 8-bit alpha channel. Pack it as an ICO with the PNG to ICO tool when it goes back on a shortcut or a favicon.ico.

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 "Favicon loading state opacity" tool is free and opens without a sign-in, an account or an install.

Nothing. The "Favicon loading state opacity" tool holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

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.

No, it takes one file at a time. If you drop or choose several, only the first is used; run the tool again for the next one.

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 "Favicon loading state opacity" tool: ICO opacity changer, Favicon inactive tab indicator, Favicon mood styling, Change a favicon's color. Each opens on its own page, free and in the browser.

The "Favicon loading state opacity" 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.