What it does
Squoosh is a free, browser-based image compression tool built by Google. You drag in any image and it lets you convert it to WebP, adjust quality, and see the file size difference live — before you download anything.
Nothing is uploaded to a server. It runs entirely in your browser, so there's no privacy concern with client screenshots or sensitive images.
Why marketers need this
Google's Core Web Vitals score penalises large images. WebP files are typically 25–35% smaller than PNG or JPG at the same visual quality — which directly improves your LCP (Largest Contentful Paint) score and page load speed.
If your site images are still PNG or JPG, switching to WebP is usually the single highest-impact change you can make for PageSpeed without touching any code.
How to use it
- Go to squoosh.app
- Drag your PNG or JPG into the window
- On the right panel, open the codec dropdown and choose WebP
- Drag the quality slider — 75–80 is usually indistinguishable from the original
- Check the file size in the bottom bar — you'll typically see 50–70% savings
- Click Download