Compress JPG
Shrink JPGs with a quality slider and live preview.
75 is a good default. Below 50, edges start to show blocking.
How to use Compress JPG
- Drop your JPG files onto the upload area. Any number of files works.
- Set the quality with the slider. Around 75 gives a large saving with no visible difference.
- Click Compress.
- Check the new sizes, then download each file or click Download all for a zip.
Guessing a quality number and re-downloading to check the result is slow. This tool re-encodes the first image in your batch as you drag the slider, so you see the actual file size and the actual visual result together, before you commit to compressing everything.
Photographs typically hold up well down to quality 60-70 with no visible loss; below 50 is where blocky artefacts start showing up around sharp edges and text. The preview makes that threshold obvious for your specific image rather than a generic rule of thumb.
Everything runs in your browser — nothing is uploaded, so there's no per-file size limit. Drop in a batch, set the quality once the preview looks right, and compress them all together.
Questions
Does the preview show the exact size my file will be?
Yes — it's the same encoder running on the same file, just for one image at a time so it can update as you drag. The number you see is what you'll get.
Why does only one image get a preview?
Re-encoding every image in a large batch on every slider movement would be slow. The first image previews live; the quality setting applies to the whole batch once you click Compress.
What quality setting should I use?
75 is a solid default for photos. Watch the preview as you lower it — once you see blocking around edges or text, back up a few points.
Can I compress a lot of JPGs at once?
Yes — drop in as many as you like. There's no per-file or batch limit set by the site.
Are my images uploaded anywhere?
No. Both the preview and the final compression happen entirely in your browser — the files never leave your device.