How can I get the thumbnail of a website? [duplicate]

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Possible Duplicate:

Website screenshots using PHP

I want to create a script that will show the thumbnail of a site (let's say 400*300px ). I don't want sites like www.bitpixels.com .

So the answear could come in 2 ways:

1) You explain how could I take the screenshot of a website (using only PHP,ajax, etc,... no .NET or other stuff like that :D )

2) You know a website that offers this type of service for free and there's no limitation in the number of thumbs you can get, or their size.

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You may want to try wkhtmltopdf (webkit-based html to pdf conversion), it also contains wkhtmltoimage, a version of it that outputs images. It's open source and if you have any sort of dedicated machine you should be able to use it. Otherwise I am not sure. Since it is webkit based it should provide you with a decent rendering of the page too.

Another great tool for this is PhantomJS