ShortenMyURL

Shortening URLs helps to manage them for both large-scale projects and everyday tasks. Shorter URLs save valuable space in your spreadsheets by fitting in smaller cells. They also look better than their full-length versions. Use ShortenMyURL to shorten URLs in no time on your iPhone, iPad, and Mac. And now, save even more time with ShortenMyURL's new “Session History” feature, which shows your most recent long and shortened URLs. 

ShortenMyURL is an open-source app meaning that its codebase is freely available on GitHub, which enables you to:
1) ensure that no nefarious background activity is conducted by this app;
2) see/learn the inner workings of this app (if that's your thing); and,
3) customize builds per your liking for any device (if that's your thing).