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PDF Knowledge

A one-stop information centre to learn all about PDF, including how to open PDF files on the browser, adding password to protect your PDF files, downloading PDF files and much more.

Related Software:

Wondershare Editor

Emily Xiao

Senior editor

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Transfer PDF to iPad without iTune But DropBox
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How to Save PDF Files on iPad
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How to Lock A PDF File
How to lock a PDF file with password? This article gives you a satisfying answer by guiding you through the whole process of locking a PDF file.
How to Sign PDF on iPad
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How to Format PDF for iPad
Format PDF for iPad: this article tells you how to format PDF to suit for reading on iPad.
How to Make PDF Read Only in Windows 8
Need to make PDF files read only? If so, follow this guide to make a PDF read only with 2 steps in Windows 8, Windows 7, and Windows Vista.