How to use it
- Drop your JPG files here, even a whole folder's worth.
- Set the quality (75% is a good start), or enter a target size in KB.
- Compress, then download the image or a ZIP.
Why MozJPEG is smaller
MozJPEG is the JPEG encoder developed by Mozilla. It picks quantization tables, scan order and rounding more cleverly (trellis quantization) and writes progressive JPEGs, which also appear sooner on web pages. In our test a 12-megapixel iPhone photo came out about 17% smaller at the same quality than with the browser's built-in encoder.
Encoding runs in a background thread, so 20–25 images at once won't freeze the page.
Metadata and tips
Photo EXIF data (date, camera, GPS location) is removed by default when compressing, which is good for privacy. You can choose to keep it, with or without the location.
- 75–80%: ideal for websites, email and social media.
- 85–90%: for printing and archiving.
- For a strict size limit, use target-size mode, or try the 100 KB version.
Nothing is uploaded.
Frequently asked questions
Are JPEG and JPG the same?
Yes, only the extension differs. JFIF files are read too.
Does compressing again make it worse?
Each lossy save loses a little, so always start from the original rather than an already compressed copy.
How many images can I compress at once?
25 or more; your device's speed is the only real limit.
Last updated: November 13, 2026