Image compressor.

How to compress images

1. Choose up to ten JPG, PNG or WebP images.
2. Set the compression quality. The default of 80 is a good starting point for photographs.
3. If you need a file under a limit, tick Aim for a specific size, enter the number and choose KB or MB. The tool works towards that size.
4. Press Compress image(s) and download each result, with the before and after sizes shown beside it.

Picking a quality setting

Lossy compression throws away detail the eye is least likely to miss. For most photos, a quality around 75 to 85 cuts the file dramatically with no difference you could point to. Below 60, blocky edges and smeared texture start to show, especially around text and in skies. Screenshots, logos and line art are different: they compress better as PNG, and heavy JPEG settings leave visible fringing around sharp edges.

Targeting a size is handy for forms that cap uploads at 100 KB or 2 MB. Very tight targets on large photos may force the quality down further than you would like; if the result looks poor, resize the image smaller first and compress again.

Compression that stays private

Every image is compressed by your own browser inside an isolated frame with no network access. The files are never uploaded, so identity documents, receipts and family pictures can be shrunk without trusting a server with them. Advertising on the page is served outside the frame and cannot reach the images you choose.

Limits

• Up to ten files per run.
• PNG is a lossless format, so the quality setting has less effect on it than on JPG or WebP and the savings are usually smaller.
• Metadata such as camera details and GPS location is not copied into the compressed copy.