Compress JPG
Make your JPG images smaller for email, web uploads or storage — with real control over quality, resolution and even a target file size. Everything runs in your browser; your photos never leave your device.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to compress
- 1
Add your JPG images
Drag and drop your JPG images onto the tool, or click to browse. Everything stays on your device.
- 2
Set the compression
Choose a quality level, a maximum resolution, or a target file size in megabytes — for all images at once or per image. The estimated size updates live.
- 3
Download the result
Save a single image directly, or get them all as a .zip. Free, instant, and never watermarked.
Why use Compress JPG?
Real compression control
Most compressors give you a single slider. Here you control quality, maximum resolution, output format and even a target file size — globally or per image.
See the savings first
The estimated output size updates per image and in total as you change settings, so you find the sweet spot before you download.
100% private
Compression runs locally in your browser. Your images are never uploaded, stored or seen by anyone.
Works on any device
No install and no account. It runs in any modern browser on Windows, macOS, Linux, Android or iPhone.
How JPG compression works
JPEG compression discards detail your eye barely notices. Two levers do the heavy lifting: lowering the quality removes more of that detail, and reducing the resolution cuts the pixel count (halving the longest edge roughly quarters the data). LocalTools applies both and shows the estimated result per image, so you can find the smallest size that still looks great.
Hit a specific size
Need to get under an email or upload limit? Set a target size in megabytes and LocalTools compresses each image to meet it. You can also override a single image — keep one important photo at high quality while squeezing the rest.
Guides & explanations
Email bounced your attachment, a form rejected your upload? Here’s why photos are so large, what actually makes them smaller, and how to shrink them without visible quality loss.
Read the guide →A practical decision guide to the three formats you actually meet: what each one is good at, where each one fails, and the conversions that make sense (and the ones that don’t).
Read the guide →JPEG DCT blocks, PNG filters, WebP and AVIF, lossy vs lossless, generational loss, and exactly what the quality slider is trading. Practical rules for photos, screenshots, logos and print.
Read the guide →Frequently asked questions
How small can I make a JPG?
Very small. Combine a lower quality (e.g. 60%) and a reduced resolution (e.g. 1600px), and a typical photo can drop to a few hundred kilobytes or less. The estimate updates before you download.
Are my images uploaded to a server?
No. Decoding, any editing, and the conversion all run entirely in your browser. Your files never leave your device, so it even works offline once the page has loaded.
Can I convert several images at once?
Yes. Add as many as you like — a single image downloads directly, and multiple images are bundled into one .zip so you get everything in a single click.