For a web designer it is not possible to install all the web browsers in a computer to test a website how it looks in different web browsers. But it is very important to check how your web site looks in a particular web browser. Most of designers have some of popular web browsers installed caring for majority. But if you can care for most of the browsers that will be better and most of the audience will care for you.

BrowserShots is I think one and only website that let you check the browser compatibility of a website.

Using BrowserShots  you can check browser compatibility of a website for Linux, Windows, MAC and BSD based browsers. There are over 70 browser to check your website compatibility. If you select large number of browsers to check your website compatibility it will take more time. It will take a screen shot of your website in different web browsers and you will be able to decide that is good or not. The service is free for all.

Go for BrowserShots