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It works much better than any of the alternatives listed here, I'm surprised noone mentioned it yet.

Here is an image compressed to the same size with

MozJPEG is especially impressive at reducing artifacts around text:

> If you want to run MozJPEG on your own machine, then you’ll need to use an ugly command-line program.

:(

And I'm out.

Command-line-only apps are typical of this genre of software (pngquant, pngcrush, all the webp utilities, ffmpeg, etc.)

However, sometimes there are GUI apps which wrap the tool itself.

There has been a request pending for it on the IrfanView forums for 3 years now ;)

If you need to do one-off Mozjpeg compressions, I highly recommend imageoptim's online compressor, which you can find here:

It has sensible defaults and is super-easy to use.