Review of TinyPNG powered by the Slant community.
TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG files. By selectively decreasing the number of colors in the image, fewer bytes are required to store the data. The effect is nearly invisible but it makes a very large difference in file size!
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Pros
Pro Online based
Pro Fast
Pro Great compression
Pro Paid option, very useful
Pro WordPress Plugin
Cons
Con ZIP download
I'd prefer another way, but I guess no choice...
Con Online
Offline tool would be great too.