WebP opacity changer.

PNG is read by every browser and keeps the alpha exactly. Convert the PNG to WebP with the compressor if you want the smaller file; the transparency carries over.

The opacity is baked into the file, so the browser composites one image instead of applying a CSS opacity at runtime. Useful in complex layered designs.

Yes. Process the overlay at the exact opacity, use it as a background-image, and no opacity rule is needed: the image carries its own.

Make variants at the sizes you serve and pick them with srcset; a baked opacity behaves the same at every viewport.

Place it with CSS, absolute, fixed or in a grid, and the content underneath shows through; no blend modes needed.

A little. A gradient means many distinct alpha values, which a PNG compresses less well than one flat opacity. The effect usually justifies 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.

No. The WebP opacity changer is free and opens without a sign-in, an account or an install.

Nothing. The WebP opacity changer 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 opacity changer: WebP transparency creator, WebP color tone changer, PNG opacity changer, Hero section image fade. Each opens on its own page, free and in the browser.

The WebP opacity changer 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.