Tinypic is a lite application that will make your photos lighter without affecting their quality.
The prgram is very easy to use,you only need to choose the photos you want to reduce and then, enter the desired output size.
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First, you choose the output size, then, drag and drop any picture and TinyPic will do the rest.
It will take not more than 2 seconds.
Tinypic is very easy to use and the results of the conversion are really good, so if you need to send photos and you want to make them lightter before sending them, TinyPic canbe a good choice.
2 reviews 
Comments
I recommend Google's Picasa, it does the same and has many more options.