Invaluable for building document libraries and the like

I’ve used this on multiple sites and have found it invaluable.

While I’ve struggled with getting the required ImageMagick set up and working on a few servers – each one requiring a slightly different approach owing to different OS and security settings – this is not the fault of the plugin or plugin author.

I’m not sure what one reviewer means by this being built-in to WordPress; to the best of my knowledge that is incorrect.