Availability
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Rating
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Duration

7 Days

Adobe Acrobat Pro provides you with the ability to scan, edit, sign and annotate PDFs quickly and easily. The free trial is for 7 days. If you wish to keep the service it is around $17 per month. 

There is of course the free version Adobe Acrobat Veiwer, however this does not allow you to edit, sign, annotate or anything else other than open and read a PDF.