ImageOptim

All the positive reviews here are deserved, but I want to add something that's essential, from my point of view, when dealing with PNG: you get even better results when using first ImageAlpha (by the same dev), it then automatically sends its result to ImageOptim and can achieve up to 90% gain!

hello, thank you for your nice app (ImageOptim), but here we have one problem that, when we are going to comprise the images after comprise it giving us back-up the original image in the trash, can you please help me with it! Thank you.

This is a really good app for compressing images, especially PNGs. However, if you run it on a lot of images it kicks the computer fan on pretty hard. Not sure why.

It's so good that I actually want to pay for a free app. I use it everyday. Great support for many formats. Integrates with sites and automatic processes too. Thank you for this great tool. Very sporting of all contributors to open source to make it free.

★★★★★ A long-time favorite with many photographers for fast & easy optimization of PNG and JPEG images for web use. Highly recommended! Support development with a donation if you enjoy using it!

Very nice, this update includes SVG optimisation!!! This adds to an already totally brilliant and essential tool for anyone. I use it to optimise figures before creating PDFs as I have more control in ImageOptim than any of the PDF optimising tools... It works just brilliantly, and integrates with services, so for example for screenshots I use a service that resizes the screenshot 50% and then runs automagically through ImageOptim with lossy enabled to get a PNG reduced by more than 80% in size on average from the original!

This is fantastics, and it’s free. Recommended.

It is really not bad for a free app. Recommend

Nice app. Comprehensible. Easy to use.

Any possibility to have an option to disable automatic installation of new updates?

Thanks to the developer Kornel Lesiński and all 3rd party related developers for this great app! Cloud storage space and data transfers come at a cost, and whenever possible, size of a file should be reduced. Especially so when a file is shared with other people—thinking in the best interests' of others always pays off. ImageOptim is very helpful in this regard.

Caution! ClamXav claims this software is infected with "PUA.OSX.InstallCore".

Still the only app I've ever encountered that insists on auto-updating without user intervention, and without providing a means of disabling it. The only warning you get is the sudden appearance after quitting the app of a dialogue advising that, "Autoupdater" would like to make changes to the system. Not a single mention of ImageOptim anywhere in that dialogue. The only clue is when you look in the Trash and see the discarded version there. The dev, when contacted, could offer no good reason for this behaviour, and refused to change it. I've disabled it manually, but this shouldn't be necessary.

This is an excellent update, allowing a temporary lossy option and an extension to compress images *within* Mail, really great!

Thank you for making it easier to slim down my web images :-)

Incredibly useful and easy to use

You've got Version 1.5.3 here instead of 1.5.4.1

The current stable version available from the website appears to be 1.5.1, not 1.5.3, and is compatible with 10.8+.

The last version to work with Snow Leopard 10.6 and Lion 10.7 is ImageOptim1.5.4a4.tar.bz2 , which is a beta. Just add the site's domain name in front of this archive's name to download.

Indispensable. I'm looking into getting Codekit and if so I might not need this. But It's been a great tool that always shave off some more with quality retained or make images generally publishable.