Compress up to 100 images at once without uploading them anywhere

Product photos, screenshots and phone pictures are often much bigger than they need to be. Most online compressors work by uploading your files to a server. If you would rather keep the files on your own device, a browser-based tool can do the same job locally.

Disclosure: I run the site mentioned below.

How it works

1. Open Pixnelo's image compressor. No sign-up is needed.
2. Drop in your photos, or paste them from the clipboard. You can add up to 100 at a time.
3. Keep the original format, or set an exact target size such as 100 KB.
4. Download the files one by one, or grab everything as a ZIP.

It supports JPG, PNG, WebP and AVIF, and the images are processed in your browser instead of being sent to a server.

Things to know

• Images that are already well compressed may not get smaller. The tool shows the size change for each file, so you can see what happened.
• PNG is a lossless format, so hitting a small target usually means reducing the pixel dimensions first.
• Always check the result before you upload it somewhere that has a strict size limit.

If you need a smaller exact size for a form, the target-size page does that in one step.