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Ayan SarkarAyan Sarkar 

How to take desktop screenshot at any instance and converted into a pdf file?

For Example - I will have a button on the visualforce page on whose click the account's object limit page's screenshot should be taken and converted into a pdf file.
NagaNaga (Salesforce Developers) 
Dear Ayan,

Please check the below link

http://stackoverflow.com/questions/4912092/using-html5-canvas-javascript-to-take-screenshots

http://html2canvas.hertzen.com/

You can use  AJAX to send the image back to the server and that can be forwarded  to a VF page with the renderAs="pdf" attribute.

Please let me know if this helps

Best regards
Naga kiran