The best compression algorithm to use

Hello Suners,
I have a 7 GB file and i need to compress it to be 2 GB at most in order to upload it and download it faster.
What is the best compression algorithm to use in this case? can i get the desired size and if i do how could i decompress it?

abulseed wrote:
OK,
in fact it's not just a one file it's a folder containing number of files with different types the total size of them is 7GB,
is there an algorithm can compress that folder to at most 2GB and if there one give me a link.You seem to be missing the point that it's the actual data in the files that matters for compression. A 7 GB file consisting of the words "Hello World" over and over again will compress quite significantly. A 7GB image file on the other hand will not compress hardly at all.
Take the java.util.zip package read [http://java.sun.com/developer/technicalArticles/Programming/compression/] and try for yourself with your data. If you are hoping to compress unknown data from 7Gb to 2GB the answer is that that promise is impossible to make.

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