When short really counts, you want to know you're using a URL shortener that will get the job done. Short URLs are particularly important to microbloggers (for example, Twitter, Plurk, and Jaiku users) who have a limited number of characters (140 or less) to get their messages across.
Check out the list below to find out how short the most popular URL shorteners really make your URLs.
TinyUrl = 25 characters
budURL = 18 characters
Bit.ly = 14 characters
Cli.gs = 14 charactersis.gd = 13 characters
Snurl / SnipURL / Snipr / Sn.im = 13 characters