Whaa.tk is described as 'Welcome to whaa.tk! Are you sick of sharing long URL's to your friends? Would you like to rick roll a friend without him having any idea about the link you're referring him to? Then you've come to the right place!' and is a URL Shortener in the category. There are more than 50 alternatives to Whaa.tk, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Windows, Linux and SaaS. The best alternative is Kutt, which is both free and Open Source. Other great sites and apps similar to Whaa.tk are bit.ly (Freemium), Polr (Free, Open Source), YOURLS (Free, Open Source) and TinyURL (Free).
Shorten URLs from anywhere with bit.ly. Bit.ly allows users to shorten, share, and track links (URLs). Reducing the URL length makes sharing easier. Bit.ly is available as a website, as a bookmarklet, and as a robust and open API.
Earn money for each visitor to your shortened links with adf.ly! Use a URL shortening service that pays. adf.ly is a free URL shortening service with a twist: get paid to share your links on the Internet! Just register for an account and start shrinking.