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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.

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Emily Xiao

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Search PDF and Text in a PDF File on iPhone
If you want to know how to search for PDF files on iPhone or how to search text in a PDF file, then check out the information below.
Easy Ways to Save PDF Files on iPhone
You can directly save PDF files to your iPhone for keeping or future reading. This article tells you how to save PDF files in Safari and email to iPhone
How to email PDF files from iPhone
You can email PDF files from your iPhone to your partners, workmates, family members, and even yourself. This article tells the simplest way to email PDF from iPhone. Check out right now!
Transfer PDF to iPad without iTune But DropBox
If you want to import PDF files from computer to iPad without using iTunes, you can use DropBox to sync PDF to iPad. Here is how.
2 Sites to Get PDF eBooks
Having problem in finding the right PDF document on the Internet? To solve the problem, you need PDF search engine. Here, we present you with 3 PDF Search Engine.
Top 5 OCR Tools You Should Know
In this article, top 5 free OCR apps are introduced. So you can choose the one that meets your requirement.
Top 6 Free OCR Readers to Handle Scanned Files
How to read scanned PDF, images and file? OCR Reader is needed. This article introduces 7 free online OCR readers to help you read scanned files
How to Download Google Books as PDF
Want to find the books in Google Books and save them as PDF format? This article tells you how to download Google books as PDF format.
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 Backup/Transfer PDF from iPad to PC/Mac
Back PDF from iPad to PC & Mac: this article is a detailed guide for how to transfer PDF from iPad to PC/Mac.
How to Extract Photos from PDF Files
Extract photos from PDF: Have received a few PDF file which contains piles of photos and need to tear these photos off the PDF? Here is the best and easiest way.
How to Sign PDF on iPad
If you need to sign PDF on iPad regularly, then do not miss this article, which tells you how to sign PDF on iPad for totally free.
How to Annotate PDF on iPad
This article is all about how to add annotation to PDF file on iPad. Free apps for adding annotation to PDF on iPad are introduced here.
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 Save PDF Files on iPad
Save PDF on iPad: if you are a new user to iPad, you might need to know how to save PDF files from Email or from the Internet. Here is the detail for how.
Safari Can’t Open PDF Files in OS X Mavericks – Solve It
Find that Safari in OS X Mavericks can’t open a PDF file like it use to be? If so, you can try the following ways to open PDF files more easily in Mavericks.
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.
How to Manipulate PDF Files in Mac
Wondershare PDF Editor lets you manipulate PDF files with easy clicks. Just click to split, merge, crop, extract PDF files, and edit PDF text. Learn how to manipulate PDF files now
How to Protect PDF Files on Mac with Passwords
If you want to protect your PDF files with passwords on Mac, try Wondershare PDF Editor for Mac. It lets you protect PDF files from being opened, printed,
Two Ways to Save PDF Files from Google Chrome
Cannot save PDF file opened in Chrome? Actually, it is pretty easy. You can save any PDF file opened in Chrome with the following two ways.

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