What Image Compressor does
Image Compressor makes JPG, PNG and WebP files smaller without changing their dimensions. Move the quality slider, choose the output format and see exactly how much space you saved, in percent and in kilobytes. Smaller images load faster on websites, send faster in messages and fit under upload limits.
How to compress an image
- Add an image.
- Set the quality. The default of 70% suits most photos.
- Keep the original format or switch to JPG or WebP.
- Press Compress image.
- Check the saving and the picture, then download.
Choosing a quality setting
| Quality | Result | Typical use |
|---|---|---|
| 85–95% | Almost indistinguishable from the original | Photography, printing |
| 65–80% | Small loss that is hard to see | Websites, e-mail, sharing |
| 40–60% | Visible softening in detailed areas | Previews, very tight limits |
| Below 40% | Obvious artefacts | Rarely worthwhile |
Start at 70%. If the result looks clean, try lower; if you can see blocky areas or halos around text, go higher.
Why format matters
- JPG is built for photographs and compresses them very well.
- WebP usually gives smaller files than JPG at the same visual quality, and supports transparency. Modern browsers and apps support it, but some forms accept only JPG or PNG.
- PNG is lossless. The quality slider has no effect on it, so a PNG photo will hardly shrink. To make a PNG photo much smaller, choose JPG or WebP as the output format. Keep PNG for logos, screenshots and images that need transparency and crisp edges.
Use cases
- Speeding up a website or online shop by reducing image weight.
- Sending photos by e-mail without hitting the attachment limit.
- Saving storage space on a phone or cloud drive.
- Reducing pictures before placing them in a document or presentation.
“The result would not be smaller”
If the tool reports that the image is already well compressed, it means saving it again at your chosen quality would not reduce the size. Lower the quality, switch format, or reduce the dimensions with Image Resizer. A 4000-pixel photo displayed at 800 pixels wide should be resized first; that saves far more than compression alone.
Compress or compress to KB?
| You need | Use |
|---|---|
| A smaller file, judged by eye | Image Compressor |
| A file below a stated limit, such as 50 KB | Compress Image to KB |
Good to know
- Dimensions are not changed by this tool.
- The compressed file contains the picture only. Camera details and GPS location stored in the original are not copied, which is helpful for privacy.
- Always compress from the original. Compressing a compressed JPG again adds artefacts without much benefit.
Privacy
Compression is done by your browser on your own device. The image is not uploaded to our server.