Validate Responsiveness of Your Website
If you are developing your website and want to make sure that it should run on all Screen Resolution (i.e. to validating Responsiveness of your Website).
I have found a wonderful website to check your website online on almost all kind of screen resolutions.
The Website name is Responsinator.
You have to just input your URL and you will see your website in all resolutions.
Attached are few screenshots of my websites.