Tinycc provides users with a URL shortening service with an option to customize the back half of the link. It allows users automatic generation or using any combination of words and letters for their shortened link. The links provided by Tiny.url doesn't expires or breaks in email postings. It lets you add its toolbar button on your browser for easy drag and drop access. This feature is supported with all the platforms or browsers which allow javascript. Tiny.url allows you to redirect someone to anywhere within your site by appending a slash and the pages filename to the link. This tool can also be attached to your website or blog by adding a block of code provided by them.
Bitly doesnt offer this service in their free plan. They consider it to be a premium feature and have made it available only to their paying customers.Another reason for this is to prevent spammers from abusing Bitly. "Bitly has
URL Shortening Tools Bitly