Compress

Compress WebP Images

Reduce the size of WebP images with quality control or lossless optimisation. WebP is already efficient, so use this when you need to squeeze a bit more out of files for a fast website.

Compression

How should the size be decided?

Quality80

The sweet spot for photographs.

Your files never leave this device. Everything happens inside your browser, so there is no upload, no server copy and nothing to delete afterwards. You can test that claim: load this page, turn off your internet connection, and the tool still works.

How WebP compression works

WebP has two entirely separate modes inside one file format, and choosing the right one matters more than any quality setting.

Lossy WebP works like a modern successor to JPEG. It predicts each block of the image from its neighbours and stores only the difference, which is a considerably more efficient approach than JPEG's. For photographs it typically produces a file 25-35% smaller than JPEG at matched visual quality.

Lossless WebP works like a modern successor to PNG, using a mix of colour transforms and entropy coding. It usually beats an optimised PNG by around 25%, and unlike lossy mode it reproduces every pixel exactly.

Both modes support transparency, which is WebP's other significant advantage: a photograph with a soft transparent edge can be a single small lossy WebP rather than a large PNG.

WebP quality numbers are not JPEG quality numbers

This trips people up constantly. The two scales are not comparable, and WebP is more conservative: WebP at quality 80 looks roughly like JPEG at quality 85-90, and produces a smaller file than either.

In practice, 80 is a good default for photographs, 70 is fine for images that display small, and going above 90 rarely buys anything visible while the file grows quickly. If you are converting an existing JPEG, do not try to match the number — start at 80 and judge it by eye.

Where WebP belongs, and where it does not

Use WebP on your own website, blog or portfolio. Every current browser has supported it for years, page weight is a real ranking factor through Core Web Vitals, and it is the single easiest performance win available for an image-heavy site.

Do not use it for marketplace listings. Etsy, Amazon and eBay all expect JPG or PNG, and an upload form that rejects your file is a worse outcome than a slightly larger one. The same applies to anything a client or printer will open in desktop software, where WebP support remains patchy.

For those, convert back with the JPG converter or keep a JPG copy alongside.

A note on re-compressing

If you feed an existing lossy WebP into this tool, you are compressing something that has already been compressed. The same generation loss that affects JPEG applies here: detail discarded on the first pass cannot come back, and the second pass discards more.

Gains are also modest, because a well-encoded WebP has little left to give. If you want a meaningfully smaller file, reducing the pixel dimensions with the resizer will do far more than another round of compression.

How to compress WebP Images

Drop your WebP files onto the box above.
Choose lossy quality, or switch on lossless if the image is a graphic with hard edges.
Check the preview, then adjust until the size and quality balance suits you.
Download individually or as a ZIP.

Limits worth knowing

Every tool has boundaries. These are this one's, stated plainly so you do not waste time discovering them yourself.

WebP is already a well-compressed format, so gains are smaller than you would see compressing a PNG or an unoptimised JPG.
Re-compressing a lossy WebP loses quality again, the same way re-saving a JPG does.
WebP files do not carry DPI information, so print resolution cannot be set on them.

Frequently asked questions

When should I use lossless WebP instead of lossy?

Use lossless for logos, screenshots, icons, line art and anything containing text. Lossy WebP smears sharp edges the same way JPEG does. For photographs, lossy WebP at quality 75-85 is dramatically smaller and looks the same.

Is WebP supported everywhere now?

Yes, in every current browser, and it has been for years. The remaining friction is desktop software and marketplaces: some older photo editors and some seller platforms still reject WebP uploads, so keep a JPG copy for those.

How much smaller is WebP than JPEG?

For photographs, typically 25-35% smaller at matched visual quality. For graphics with transparency, lossless WebP is usually around 25% smaller than an optimised PNG.

Does WebP support transparency?

Yes, in both lossy and lossless modes, which is one of its main advantages over JPEG. That means a photo with a soft transparent edge can be a single small WebP rather than a large PNG.