Scoped SEO
Add to ChromeImage Compressor for JPG, PNG and WebP
Make images smaller without sending them anywhere. JPG uses the MozJPEG encoder, PNG uses a lossless optimizer, and you can switch any image to WebP for the biggest saving.
- 1Add your images
- 2Choose quality
- 3Download
How to use it
- Drop your images on the box. JPG, PNG and WebP are supported.
- Choose the quality and whether to keep each format or convert to WebP.
- Review the saving on every row, then download the files or a ZIP.
Your privacy
This tool runs in your browser. Your files and text are never uploaded or stored.
Spot this in the extension
The Images tab of Scoped SEO flags oversized images, missing alt text and non-WebP formats on any page, and links straight here to fix them.
Choose the right format first
| Image | Best choice | Why |
|---|---|---|
| Photo | WebP or JPG | Lossy formats suit photos. |
| Logo, icon, screenshot | WebP lossless or PNG | Sharp edges stay sharp. |
| Needs transparency | WebP or PNG | JPG has no alpha channel. |
| Smallest possible photo | AVIF | Slower to make, often the smallest. |
Pick a format-specific page for tuned advice: Compress JPEG, Compress PNG or Compress WebP.
How small should an image be?
There is no single target, but as rules of thumb: article photos under about 150 KB, full-width hero images under about 300 KB, and thumbnails under 30 KB. The best saving usually comes from shipping fewer pixels, so combine compression with the Image Resizer.
Why it matters for search
Large images are the most common reason pages feel slow, and slow loading hurts Core Web Vitals scores such as Largest Contentful Paint. Compressing images does not guarantee higher rankings, but it removes a common performance problem and makes the page better for visitors on mobile data.
Common questions
Is the compression lossy?
JPG and WebP use lossy compression at the quality you choose. PNG is optimized losslessly, so the pixels do not change. Convert a PNG to WebP if you want a larger saving.
Are my images uploaded?
No. Compression runs in your browser with WebAssembly encoders. Nothing is sent to a server.
What is the best quality setting?
For photos, 70 to 80 is usually indistinguishable from the original at a much smaller size. Compare the preview before you download.
Is it better to compress or resize?
Do both, resize first. Fewer pixels give the biggest saving, and compression then trims what is left.
Related tools
Compress JPEG
JPEG compression with MozJPEG. See the saving per photo.
Compress PNG
Lossless PNG optimizer. Same pixels, smaller file.
Compress WebP
Re-encode WebP at a lower quality. Never returns a bigger file.
Image Resizer
Resize by pixels or percent. Export WebP, JPG or PNG.
Audit the whole page in one click
Scoped SEO checks content, links, images, schema, speed and AI search readiness, then points you to the right fix.
Add to Firefox