You not need registered as a member to using this utility , upload the image through your computer and URL.After uploading pictures, Smushit compress your image automatically with provided optimal compression without affecting the picture quality.
I upload a picture with size 512KB for testing.After compressed become 429.78KB by saving 16.17%
Then you can download the image after compressed to your computer and replace it.
Before compressed ( size 512KB )
After compressed (size 429.78KB )
These two photo are same and clear,isn’t it ?
Moreover,smushit also provided Firefox addon that easily compressed all the image or photo in a webpage .