WebP Image Compressor

How to compress WEBP images

1. Drop your images onto the compressor above — any format works: JPG, PNG, WebP, GIF, BMP, AVIF, TIFF.
2. Adjust the quality slider to control compression. 75–85% is the sweet spot for most use cases.
3. Click Compress on a single file or Compress all to process everything at once.
4. Download individually or click Download all to get a ZIP of all compressed WebP files.

Your images stay on your device — 100% private

Compressing images for a website usually means handing client assets to a third-party service — product shots before launch, unreleased marketing images, screenshots of internal tooling. This compressor never uploads anything. Your file is read locally, re-encoded by the browser's own WebP encoder, and returned as an in-memory download.

You can confirm it rather than take our word for it: open DevTools → Network, compress a batch, and watch for outgoing requests carrying image data. There are none. After the page has loaded, the tool keeps working with the network disconnected entirely.

// The browser's own WebP encoder does the work — nothing leaves the tab
canvas.getContext('2d').drawImage(img, 0, 0)
canvas.toBlob(blob => download(blob), 'image/webp', 0.82)

Why use WebP compression?

WebP is a modern image format from Google that reaches noticeably smaller file sizes than both JPG and PNG at comparable visual quality. It supports lossy compression, lossless compression, animation and a full alpha channel — which means it can replace JPG, PNG and animated GIF with a single format.

The gain over JPG comes from a better encoder: WebP predicts each block from its already-encoded neighbours before compressing the difference, so smooth areas cost almost nothing to store. Against PNG, lossless WebP simply uses stronger entropy coding and a larger set of prediction filters than PNG's DEFLATE.

Best use cases for WebP

• Website images — the single biggest Core Web Vitals win most sites have available
• E-commerce product photos — a catalogue page with 40 images benefits enormously
• Blog images — same visual result at a third of the bandwidth
• Replacing transparent PNGs — WebP keeps the alpha channel and is around 26% smaller

WebP vs JPG vs PNG — format comparison

The one place WebP still loses is outside the browser. Older versions of Photoshop, Lightroom, many print shops and some email clients will not open a .webp file. Use WebP for anything served on the web; keep a JPG or PNG master for anything that has to be opened in desktop software or sent to a client.

WebP quality settings — what each level actually costs

WebP holds up better at low quality than JPG does, so the usable range extends further down. For a typical photograph:

Set quality to 100% and the encoder still runs in lossy mode — it just discards very little. Compress, then click the preview thumbnail to inspect the result full-screen before downloading; if it is too soft, raise the slider and re-compress.

Serving WebP safely with a fallback

Every browser released in the last several years supports WebP, but if you need to cover older Safari or an unusual email client, the `<picture>` element lets the browser choose. Browsers that understand WebP take the first source; everything else falls back to the `<img>` tag.

<picture>
  <source srcset="/img/hero.webp" type="image/webp">
  <img src="/img/hero.jpg" alt="Product hero shot"
       width="1200" height="630" loading="lazy" decoding="async">
</picture>

Two details that matter for Core Web Vitals: always set width and height so the browser can reserve space and avoid layout shift (CLS), and use `loading="lazy"` on everything except the largest image above the fold — lazy-loading your LCP element makes the score worse, not better.

One more note on the pipeline here: because the source is decoded to raw pixels before re-encoding, any input format works — JPG, PNG, GIF, BMP, AVIF or TIFF all come out as WebP. Transparency survives the round trip, and all metadata (EXIF, GPS, colour profiles) is stripped.