how to see redacted text in pdf

Do you mean that you do not want others to view the sentences, right? If so, you can use the PDF redaction function.get the PDF tool with redaction function.import PDF file.select the sentences you do not want to show.confirm the PDF redaction.You can see the full guide on how to redact PDF texts: How to Redact Text in PDF Easily and Safely

You can use Wondershare PDFelement which can help you highlight text or an area in a PDF with custom color.Open your PDF in the application and go to the “Comment” tab. If you want to highlight specific text, you can click the “T” icon, If you want to highlight a large area, you can click the “Area Highlight” button.2. To change highlight color, you can right click on the text and select “Properties”. Then the options for highlight appearance will be expanded on the right side. You can then change the color.This tutorial will be helpful: How to Change Highlight Color in PDF

You need a PDF Editor for that:For Mac: You can use Adobe Acrobat DC or Master PDF Editor, both are excellent PDF editors and both of them support for filling up dynamic XFA forms (Master PDF Editor is the only PDF editor for Mac other than Adobe Acrobat DC with support for dynamic XFA forms). Truth be told all the features of Adobe Acrobat DC are available on Master PDF Editor and unlike the blood-sucking subscription of Adobe Acrobat DC you need to pay only an one time payment for $70 for Master PDF Editor. As of UI, well I like the simplistic UI of Master PDF Editor, but of course your opinion may vary from mine.For Windows: You can go for Adobe Acrobat DC, Master PDF Editor, or Nitro PDF Pro. I personally recommend Nitro PDF Pro because it not only has all the features of Adobe Acrobat DC and Master PDF editor but also has an UI that’s similar to Microsoft Office apps. Of course with a one time payment of $160 it’s pricier than Master PDF Editor but at least it’s still cheaper than the subscription plan of Adobe Acrobat DC.For Linux based distros: Master PDF Editor is the only good PDF editor for Linux, it’s the only PDF editor for Linux which has all the features of Adobe Acrobat DC, including the support for filling up dynamic XFA forms. It’s written in QT5, but it looks equally good in both KDE and GNOME3 (of course it looks better in KDE).For iOS: Just go for Wondershare PDFelements, it’s the one and only full fledged PDF editor for iOS. Just like a desktop PDF editor it lets you edit text, add or remove pages, add or remove images, reposition text or images, etc. The only thing it lacks support for dynamic XFA forms but then again none of the mobile PDF software so far have the support for dynamic XFA forms.For Windows 10 Mobile: You can go for Perfect PDF Ultimate, it’s the one and only full fledged PDF editor for Windows 10 Mobile. It’s a UWP app that works in Continuum too. It provides all the functionalities you get on a desktop PDF editor, it lets you edit text, add or remove pages, add or remove images, reposition text or images, etc. Yet again just like Wondershare PDFelements it lacks is support for dynamic XFA forms.For Android: There’re no full fledged PDF editors for Android. If you use Android then just forget it, all you can do is sign, annotate, highlight PDFs and just fill up non-dynamic PDF forms. Code-Industry, the creators of Master PDF Editor do have future plans to make their software for Android too, but right now they haven’t begun any development, but once they do it, it would not only be the first full fledged PDF editor for Android but also would be the first PDF software on a mobile platform with support for dynamic XFA forms. But as of now there’s no way to edit PDFs on Android devices.

Edit Oct 2014:  http://booksee.org and http://bookzz.org seem to be the two working versions now. Edit July 2014:  Bookfi is gone, but http://bookzz.org seems to be the official clone now. Edit April 2014:  bookza is down, but /, another clone of bookOS/za is up now!  Also,  is another clone.  These just pop up!Edit January 2014:  http://bookza.org is a functional clone of bookos that's live today!Edit December 2013:  Unsurprisingly bookos seems down for good now.  At the moment, it seems http://en.bookos.org/ is unbeatable.  Direct downloads, amazing selection, no ads, etc...  prolly won't stay up for too long though.

I am assuming that you cannot modify the PDFs as per Adam's answer, and that you have heavily invested time and resources into creating these PDFs. My recommendation, at a high level, would be to use a PDF SDK (a full parser) and scrape the necessary text information from the PDF pages, then use the scraped data to build a web UI that you can then make dynamic.You will find that parsing and displaying (rendering) a PDF are already huge challenges in and of themselves. I have not looked into pdf.js extensively, but it looks like it can only handle the rendering part. Even if it could do what we need, the parsing might be slow in the browser. My recommended approach instead moves the heavy workload of parsing + scraping to the server. Your web UI can then utilize the translated scraped data and render its UI efficiently.

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