Compress JPG Online
Reduce JPG file size online. Drag the quality slider, watch the size drop, download. Everything happens in your browser — nothing is uploaded.
Why compress a JPG?
Pick the right quality
60–75% is the sweet spot for most photos — the file often shrinks by half or more with no visible difference. Go lower (30–50%) for thumbnails or background images where sharpness matters less.
Want it even smaller?
Converting to WebP instead usually cuts another 25–35% at the same visual quality.
How to compress a JPG
- Upload — drop your JPG file(s) onto the box or click to browse.
- Tune — drag the quality slider — the result updates for the next file you add
- Download — each compressed file shows its before/after size and savings.
What we measured
We ran five JPEG photos (saved at quality 95) through this compressor.
| Setting | Result |
|---|---|
| Quality 85 | 53% of the original size |
| Quality 70 | 35% of the original size |
| Quality 60 | 28% of the original size |
If the image is much larger than where it will be displayed, resizing first saves more than compression alone. Full method and numbers: resize vs compress, measured.
Frequently asked questions
Does compression reduce quality?
JPG is a lossy format, so yes — but at 70%+ the difference is invisible for most photos. You can always re-run with a different setting; the original file on your device is never modified.
What's a good target size?
For web images, under 200 KB is a good goal for a large hero photo and under 50 KB for thumbnails.
Is this tool free?
Yes — every tool on ConvertPicto is completely free, with no account, no watermark and no file limits. The site is supported by ads.
Are my images uploaded to a server?
No. ConvertPicto runs entirely inside your browser using the Canvas API. Your files are read locally, processed on your device and never sent anywhere — we don't even have a server that could receive them.
Does it work on my phone?
Yes. The site is fully responsive and works in any modern mobile browser (Chrome, Safari, Firefox, Edge). Processing large images is naturally slower on a phone than on a laptop.