I came across a ECM archive that I need to extract.
The Unarchiver can't handle this format, and I'm not sure about other utilities.

How do I extract ECM in Mac OS X Lion?

1 Answer 1


You can use the ECM tools created by Neill Corlett, the creator of ECM. Just run "unecm" on the file.

There are binaries for Mac here

If that seems intimidating, there is a youtube walkthrough here that uses a GUI and contains links to the tools used.

  • Hey dan did you get this to work? i just bought a mac and it's lion as well. but when i follow that youtube video and try to open the GUI it gives me the error that powerpc isnt supported anymore. help anyone?
    – user11649
    Oct 5, 2011 at 20:49
  • +1 for command line tools. The video is down though
    – lajarre
    Oct 18, 2012 at 0:18
  • 3
    Note that ecm is also available via HomeBrew.
    – Tim Visher
    May 12, 2014 at 16:51
  • 1
    The binary link is broken, but Homebrew still works good! (thanks @TimVisher)
    – alanjds
    Aug 1, 2014 at 14:39
  • 4
    To update for 2015: brew install ecm; ecm *.ecm; and you're good to go!
    – Gavin
    Jul 24, 2015 at 4:13

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