Best utility for splitting large file

I have several large ISO files that I store within my Box.com sync folder which are larger than 5 GB in size and therefore are not able to be backed up to the cloud by Box.com.

What are the best utilities to use to split the size of these ISO files so that they will be smaller than 5 GB in size and therefore will be able to be backed up by Box.com?

I need to be sure I can always repackage these ISO files into their original state for when I need to use them.
IT GuyNetwork EngineerAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
WinRAR can split files into smaller containers, compressing them in the process.  Or you can just run them through your favorite file compressor; most ISO images compress reasonably well and should end up below 5 GB.

File splitting
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serialbandCommented:
I used to use hjsplit back when USB and floppies were much smaller, because you can rejoin the files with built-in DOS and Unix commands, even if the other user didn't have hjsplit.
http://hjsplit.org/

DOS
copy /b file1 +file2 +file3 file4 newjoinedfile.iso
copy /b file* newjoinedfile.txt

Unix/Linux
cat  file1 file2 file3 file4 > newjoinedfile.iso
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arnoldCommented:
Along the dr. Klahn,
7zip is a possible alternative to winrar.
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IT GuyNetwork EngineerAuthor Commented:
This is something that WinZip can do as well, right?
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Dr. KlahnPrincipal Software EngineerCommented:
WinZip (as far as I know) doesn't split to containers.
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arnoldCommented:
if memory serves, most compression tools including winzip can split the archive. though have not used winzip in quite some time.

the difference might be the options/mechanism. with 7zip, you have to add the item to an archive while specifyin how that archive should be saved, i.e. in 10Mb chunks.
The interface is somewhat similar to the winrar drop menu Dr. Klhan posted.
10MB is usually a safe message size that will be accepted. some may accept larger. but most fit within.
once all the pieaces arrive, opening the first, will automatilcally search for the presence of the others to reassemble....

have not looked at whether if you send parts, whether the built=in MS compress utility will reassemble...
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