Image Compressor
Shrink image file size with a quality slider and a live before/after comparison. Free, instant, and private.
How to compress an image
- Drop your image onto the box above (or click to browse / paste from your clipboard).
- Drag the quality slider — the compressed file size and saving update instantly. Choose WebP for the smallest result.
- Click Download to save the smaller file.
Why compress images?
Heavy images are the single biggest cause of slow web pages. They push out your Largest Contentful Paint, eat into mobile data, and drag down search rankings. Compression strips away data the human eye barely registers — subtle gradients between near-identical pixels — and often cuts file size by more than half with no obvious change. Faster pages mean better Core Web Vitals, lower bounce rates, and happier visitors. Because this compressor runs entirely in your browser, even confidential mock-ups or client photos never leave your device.
Choosing a format and quality
The right format matters more than the quality slider alone. Use this as a quick reference:
| Format | Best for | Compression | Transparency |
|---|---|---|---|
| WebP | Photos & graphics on the web | Smallest (lossy or lossless) | Yes |
| JPG | Photographs, complex scenes | Small (lossy) | No |
| PNG | Logos, icons, screenshots | Larger (lossless) | Yes |
For photographs, a quality of 70–85% is the sweet spot — files shrink dramatically while staying visually indistinguishable from the original. Drop below 60% and you may start to see blocky artifacts in skies and skin tones. Lossless PNG ignores the slider, so reach for JPG or WebP whenever you need real savings.
Common use cases
- Speeding up a website: compress hero images and product photos before upload to improve LCP and Core Web Vitals.
- Email and messaging: get bulky phone photos under attachment limits without resizing them.
- WordPress & CMS uploads: trim files before they hit your media library to save storage and bandwidth.
- Marketplace & social posts: meet platform size caps while keeping listings sharp.
- Email signatures & PDFs: shrink embedded images so documents stay lightweight.
Tips & gotchas
- Compress after any resizing or cropping — re-encoding a JPG repeatedly compounds quality loss, so always start from the original.
- If a photo has transparency you need to keep, use WebP or PNG; converting to JPG fills transparent areas with solid black or white.
- Watch the live before/after preview at the size it will actually appear — artifacts that show at full zoom often vanish on a real page.
- Need different pixel dimensions too? Resize first with our Image Resizer, then compress here.