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jpeg-recompress 2.1.1

Cut JPEG file sizes by 50% or more

by Mike Williams

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Based on 0 ratings
License: Open Source
Operating Systems: Linux, Mac OS X, Windows 10, Windows 7 (32 bit), Windows 7 (64 bit), Windows 8, Windows Server
Languages: English
Software Cost: Free
Date Updated: 27 October 2016
Watchlist: Add download to my watchlist
Downloads To Date: 1211
Developer: Daniel G Taylor
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Cut JPEG file sizes by 50% or more

Jpeg-recompress is a command-line tool which can cut JPEG file sizes by 50% or more.

The program works by intelligently selecting the lowest possible quality setting for your JPEG, which also has the minimum effect on its perceived visual quality.

The command line syntax is straightforward, and at a minimum you can get away with this.

jpeg-recompress in.jpg out.jpg

This tells jpeg-recompress to take the image in.jpg and process it at several lower quality levels. At each stage the program uses the structural similarity (SSIM) algorithm to measure the change in your image, and finally selects the lowest level that still gives you acceptable results.

We tried this out with a few sample HD photos. Processing was faster than we expected, 5 or 6 seconds to find the best quality level and save the image. File sizes were typically 50% to 25% of the original. Most important of all, there was no apparent difference between the "before" and "after" files.

If this doesn't quite work for you, there are various options to try. You could use a different algorithm to check your images, set a new "acceptable" quality level to further shrink the files, and there's a "strip metadata" switch to save the maximum amount of space.

Please note: the project download is "jpeg-archive", but jpeg-recompress is one of the bundled files.


Jpeg-recompress is an interesting tool which can deliver spectacular results, significantly cutting file size while losing minimal image quality. If you don't mind running it from the command line, or are happy to set up your own scripts, it's a must-see.

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Spotlight: Free Full Software

Windows 10 October 2018 Update (build 1809)

Free Full Commercial Software

This is the latest version of Windows October 2018 Update. it's a media creation tool that can be used to upgrade an existing installation of Windows or create installation media for another PC. Just make your choice after launching the tool and it'll do the rest.

What was new in Windows 10, when it was released? The OS brought back the Start Menu, though with a Windows 8 twist: live tiles keep you up-to-date with the latest news while also providing an easy way to launch apps. (Don't worry if you prefer the Start Screen, it's still there and you can boot into it if you prefer.)

Apps now work much more like regular desktop programs. They have minimise, maximise, restore and close buttons, and can be resized (to a degree) and organised however you like.

If you've still lost track of a program in the mass of open windows, a new Task Spaces feature can help. Click its taskbar button and you'll see thumbnails for everything running now, a little like OS X's Mission Control - just click something to switch to it.

Better still, Task Spaces also supports virtual desktops. Add extra desktops as required and it'll display thumbnails of each one, making it easy to identify whatever you're after and switch to it.

There's also smarter snapping, new customisation options, and even a bunch of experimental additions to the command prompt.

Fall Creators Update brings a whole host of new features for Windows 10. See the Microsoft Blog for more information.

The Windows 10 ISO here will give you build 1809 which is the October 2018 Update.