Compress Image to WEBP Online

Most image workflows need two things done at once: the file has to get smaller, and it has to end up in a format the web actually wants. Doing that in two steps means exporting from one tool, opening another, and keeping track of which files have been through which stage. Combining them is faster and leaves less room for the version confusion that eventually puts an unoptimised 4 MB photo on a live page.

WEBP is the right destination for almost all of it. Google’s own figures put lossless WEBP around 26 percent smaller than an equivalent PNG, and lossy WEBP roughly 25 to 34 percent smaller than a comparable JPEG. Unlike JPEG it keeps an alpha channel, so transparent logos survive the trip, and unlike PNG it does not punish photographic content with enormous files. Every current browser supports it, which has been true long enough that the old fallback argument no longer applies to most audiences.

What actually happens here is straightforward. Your file is decoded onto a canvas in your own browser, re-encoded as WEBP at the quality you select on a slider running from 10 to 100 with 80 as the default, and returned to you as a download. The output format control has to be set to WEBP deliberately, because it defaults to keeping whatever format came in. Leaving it on Keep Original converts nothing, so that one click is the step that matters if your sources are PNG or JPG.

Picking a quality level is where the real decision sits. Photographic content tolerates a lot: landscapes and product shots usually look fine between 70 and 85, and the saving over a quality 95 export is substantial. Flat graphics behave differently, because compression smears sharp edges and small text, so screenshots and interface mockups want 85 or higher even though the file ends up larger than you might like. Images containing faces sit in the middle, since banding on skin tones is the first artefact people notice.

Being clear about the trade-off matters here. WEBP compression at a quality setting below 100 is lossy, so the output is not a faithful copy of your original and should never replace it in your archive. Transparency is preserved, dimensions are untouched, and batch jobs download as a single ZIP. What the tool does not do is target a specific file size, so if a form has a hard ceiling, use the compress-to-size pages instead, which search for the right quality automatically rather than making you guess on a slider.