WebP dithering tool.

Two things. Fixing banding, where gradients show steps after compression, and making stylized effects: retro pixel looks, halftone-like graphics. Low density fixes invisibly; high density is a visible pattern.

4 to 10% usually removes visible banding without changing the image's look. Start at 5% and raise it only if banding remains.

High density, 40 to 70%, with a limited palette. Brand with "black, white" or "cyan, magenta, yellow, black" gives the look of early computer graphics.

Dither uses random RGB colors. Mono is grayscale only. Harmonized varies each pixel around its own color. Adaptive samples the image's palette. Brand uses the colors you list.

Before. Dither the source, then compress to WebP. A dithered image compresses a little less well: under 10% density, expect 5 to 15% more.

No. The browser decodes the file, a canvas does the work and the result is built on your device; the page makes no request with your image. You can load it, go offline and keep working.

The edit is written as a PNG so nothing is lost: it keeps every pixel and the alpha channel exactly. Run the result through the WebP compressor to get a WebP back for the web, usually 25 to 35% smaller than the PNG.

Nothing. The WebP dithering 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 WebP dithering tool: WebP texture generator, WebP color tone changer, Image compressor, Fix gradient banding in a WebP. Each opens on its own page, free and in the browser.

The WebP dithering tool is one of 44 in its group. The group's page, /tools/webp, 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.