can you suggest me any online website where I can enter an url of a website and take it's screenshot.
You can do it yourself pretty easy. Just press "Print Screen" on you keyboard and open up paint.net or mspaint and hold down CTRL + V. Then just crop out what you don't want and there you go .
I want to take screnshot of full webpage and so "print screen" wont help. I dont want to download any software. Is there any online website that can take website screenshot of full page just by simply entering the url.
I think there is something called thumbshot or something like that will display screen captures of websites. Is that what you mean?
BrowserShots.org is a great one and you can specify by which browser, and what sizes you want it in, etc. I have also downloaded a firefox plugin called ScreenGrab it's awesome!
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There is a firefox plug in that can do that. It's called screengrab (you should be able to find it in a search)