ImageOptim for various platforms

Linux

  • Trimage (GUI) — similar to ImageOptim and uses many of the same lossless tools under the hood.
  • ImageOptim Web Service (HTTP API) — resize and optimize images in your web applications.
  • Online interface for MozJPEG — a JPEG compressor that produces smaller, higher quality files. The web interface works with any system.

Command-line

With these tools and a bit of a glue code you can build your own image optimizer:

  • pngquant — lossy PNG compressor.
  • Zopfli, PNGOUT — the most efficient lossless PNG compressors.
  • AdvPNG — a PNG compressor with a decent speed.
  • MozJPEG — includes lossless jpegtran.
  • Lossy Gifsicle — a fork of Gifsicle with heavier compression.

Windows

The ImageOptim app only works on Macs (sorry!), but you can achieve similar compression with some other tools:

  • FileOptimizer (Download) — supports many file formats, and it's Free and Open Source.
  • Online interface for MozJPEG — a JPEG compressor that produces smaller, higher quality files. The web interface works with any system.
  • pngquant — lossy PNG compressor. It has some Windows-compatible GUI apps and Photoshop plug-ins available.

Older Mac OS X

If you use a Mac that is more than 6 years old, or haven't updated OS X in the last couple of years, you'll need an older version of ImageOptim:

Mac scripts or automator

There is a command-line interface.