Image compressor
Drop one or many photos, move the quality slider and see the new size next to the old one at once. Compression runs inside your browser, so the pictures never leave your device.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose or drop one or more images (JPG, PNG, WebP or any format your browser can open).
- Pick JPG or WebP and move the quality slider. Every file shows its old size, new size and the percentage saved.
- Download a file with its own button, or use Download all for several files.
How it works
The browser decodes your picture, draws it on a canvas at its original width and height and encodes it again with the quality you set. Lower quality throws away fine detail that the eye rarely notices, which is what makes the file smaller. The pixel dimensions do not change; to shrink those too, use the image resizer.
Choosing a quality
- 80–90% is a safe choice for pictures you will keep or print.
- 60–75% is usually enough for web pages and messages.
- Below about 40% blocky patches and blurred edges become visible.
Tips
- WebP often gives a smaller file than JPG at similar looks, but some older programs cannot open it.
- Screenshots and logos with flat colors are better kept as PNG; compression suits photos.
- The slider re-compresses every file in the list, so you can compare settings quickly.
Frequently asked questions
How much smaller will my photo get?
It depends on the picture and the quality you choose. Photos usually shrink a lot between 100% and about 75%, with little visible change. The tool shows the exact before and after size for every file, so you can pick the point you are happy with.
Are my photos uploaded anywhere?
No. The file is decoded and re-encoded by your browser using a canvas, and the result is offered as a download from memory. No data is sent to a server.
Why is the result sometimes larger than the original?
Re-encoding an image that was already heavily compressed, or a small PNG with flat colors, can produce a bigger file. Lower the quality, switch to WebP, or keep the original.
What happens to transparency and metadata?
JPG has no transparency, so transparent areas become white. Re-encoding through a canvas also drops metadata such as camera details and GPS location, which is often a wanted side effect.
Is there a file limit?
Each file can be up to 100 MB. You can add several files and download them one by one or all together; very large pictures need more memory and may be slow on a phone.