Easy File Split and Join
Easy File Split and Join is a fast and free app to split or join files. This is especially useful for sending file attachments, recombining files downloaded in parts, and getting around file size limitations. It is opimized for writing very large files even on devices with very low memory.
UPDATE — Advanced multi-file join has been added! Arbitrarily join any number of different files.
Anecdotally, joining a 400 megabyte matroska video file took 50 seconds on my Viewsonic Gtablet.
You can download Easy File Split and Join from the Android Market here.
Update 4/2012 This is now open source and hosted on GitHub. Check it out at my GitHub page.



thanks for easy to use application… i have successfully split the file on my android device… but i donot know how to join back on my laptop having windows.
On a windows laptop you can use hjsplit or DD to join them. Best of luck!
can join only 5 files max?
Perhaps your phone is cutting off the rest of the join files dialog? What is your model?
galaxy tab 7.7 android, after selected files. they show summaried box only 5 files selected everytime
Gotcha, I’ll see if I can get some test hardware to reproduce this on.