Large photos slow pages down and exceed upload limits. Re-saving at a lower quality can cut the file size a lot, usually with little visible change.
How the tool compresses
The Image Compressor redraws your image at the same dimensions and saves it again with a quality setting of 90, 70, 50 or 30 percent (70 is the default). It works in your browser, so the file is not uploaded. The result shows the original and compressed sizes.
Choosing a quality
- 90%: nearly indistinguishable, with a modest saving.
- 70%: a good balance for web photos.
- 50%: clear savings; artefacts may appear in smooth areas such as sky.
- 30%: small files, with visible blockiness. Use for thumbnails.
Which formats respond
JPEG and WebP are lossy formats with a quality setting, so they compress well. PNG is lossless, so the quality slider has no effect on it and the size may barely change. To shrink a PNG photo, convert it to JPEG or WebP first with the image converter.
Using the tool
- Choose an image, up to 25 MB.
- Pick a quality.
- Compare the sizes and download the result.
Other ways to shrink a file
Reducing the pixel dimensions saves far more than quality alone; a photo 4,000 pixels wide displayed at 800 is mostly wasted data. Use the resize guide as well. Always keep your original, since lossy compression cannot be undone.
Frequently asked questions
Does compressing remove metadata?
Re-saving through the browser drops EXIF data such as location, as a side effect. See the EXIF guide.