ImageOptim

How to use

  1. Drag'n'drop PNG or JPEG files or directories onto main table view in ImageOptim's window.
  2. Wait until it finishes.
  3. Profit! (from smaller files)

You can also drop files onto ImageOptim's Dock icon.

Learn how to change Preferences.

Icons in file table

Green Checkmark Image has been optimised successfully.
Green X Everything went fine, but image couldn't be optimised any further.
Gray star Optimisation of this file is in progress.
Gray dots File is queued to be optimised after other files are finished.
Orange exclamation mark There was an error during optimisation. You'll find explanation by running Console.app.

How does it work

ImageOptim is a front-end (GUI) for these applications:

ImageOptim runs them and automatically selects smallest file.