Once upon a time, I had a similar need.
I explored redirection services a little bit.
You can too, with Google, etc.
Many are not free, or have ads.
For you (and I), watch for the capability to mask the real url. Often it is not available.
I found:
http://www.co.cc/And... sorry to say.... never did get it to work.
It said something about the url I'd entered being "blocked". And I couldn't delete it and start over! I believe I was following their directions.....
If you try it, and get it working, let us know.
Or, perhaps someone else here, will know of a reliable one, that masks the real url, and can let us both know.
Good luck with it.