Fix gradient banding in a WebP.

Too few colors for the transition. When a gradient has fewer distinct values than it needs, the steps show. JPEG and WebP compression reduce color precision, which brings banding into areas that were smooth: skies and vignettes most of all.

Dither at 4 to 8% density. The random variation breaks up the hard edges between bands, and at that density it isn't visible as grain: viewers see a smooth gradient.

Harmonized at 5 to 10%. It varies each pixel around its own color, so blue stays blue; plain Dither can put colored speckles in a uniform sky.

A little. A dithered image has more distinct pixel values and compresses less well: expect 5 to 15% at low density, usually worth it for a banded hero image.

Before. Dither the source, then compress to WebP; dithering after compression dithers the artifacts too. Work from the best source you have.

Partly. Dithering masks mild banding in a compressed image, but severe compression damage can't be undone. Go back to the original if you still have it.

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.

No. The "Fix gradient banding in a WebP" tool is free and opens without a sign-in, an account or an install.

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

The "Fix gradient banding in a WebP" 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.