I might suggest starting with Bitly and exploring the possibility of getting a custom branded shortener, which you can set up through Bitly once the domain is purchased. For example, my website is philpallen.com but I shorten all links to philp.al/link so it's more professional.

I feel like many other shorteners look like spam, but I'd say your safe with Bitly because it's widely used. A custom one would be even better!