Really, just google the exact same words you enter here. "How to shorten url." ok, tinyurl is one. But why ask something that only takes 2 seconds to check it?
Visit the Google URL shortener site at goo.gl. If you aren't signed in, click the Sign in button in the top right corner. Write or paste your URL in the Paste your long URL here box. Click Shorten URL
The problem of goo.gl is there is no way to make statistics private. Which one is the most reliable one with private statistics?