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QPDF 5.1.3

Encrypt, decrypt or linearize PDF files

by Mike Williams

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License: Open Source
Operating Systems: Linux, Windows 7 (32 bit), Windows 7 (64 bit), Windows 8, Windows Server, Windows Vista (32 bit), Windows Vista (64 bit), Windows XP
Requirements:
Languages: English
Software Cost: Free
Date Updated: 01 June 2015
Watchlist: Add download to my watchlist
Downloads To Date: 2156
Developer: Jay Berkenbilt
RSS News Feed: http://sourceforge.net/api/file/index/project-id/224196/mtime/desc/limit/20/rss
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QPDF
Encrypt, decrypt or linearize PDF files

QPDF is a portable command line tool for processing PDF files.

The program can password-protect PDFs, or remove the encryption from an already protected file. There's an option to generate a linearized file (a web-optimised document, which can display the first page without downloading the whole thing). You can specify pages and page ranges from individual files, then export them to a new PDF. And QPDF offers advanced control over PDF streams (compression, normalization, object streams and more).

There's good attention to detail here. This isn't necessarily just about giving a PDF file a password; you can also set the encryption key length, and decide whether viewers can print the document, modify it, extract text or images, to allow annotations, and more.

Figuring out how to use all this takes some effort, even for a command line program. There are a lot of options, and the detailed documentation assumes you know precisely what you're doing.

For all that, you should have everything figured out with a little thought. A command like

qpdf --encrypt user-password owner-password 40 --print=n -- test.pdf test2.pdf

will take a file test.pdf, give it a 40-bit key, assign user and owner passwords, and disable printing, before exporting the results as test2.pdf. And while this may look complicated, work it out once and you can create a batch file or script to apply the same rules to multiple files, automatically, whenever you like.

Verdict:

QPDF has a good set of PDF processing tools, in particular for adding or removing password protection, and splitting or merging files. It's a little awkward to use, but if you're looking to automate your PDF handling with scripts then the program should be able to help.

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Spotlight: Free Full Software

WhatsApp Messenger 2.17.31

Free Full Commercial Software

WhatsApp Messenger is the world's most popular instant messaging app for smartphones.

You can use it to send and receive text and voice messages, photos, videos, even call your friends in other countries, and because it uses your phone's internet connection it might not cost you anything at all (depending on whether you'll pay data charges).

It's easy to set up and use. There's no need to create and remember new account names or pins because it works with your phone number, and uses your regular address book to find and connect you with friends who use WhatsApp already.

You can talk one-to-one or in group chats, and because you're always logged in there's no way to miss messages. Even if your phone is turned off, WhatsApp will save your messages and display them as soon as you're back online.

There's plenty more (location sharing, contact exchange, message broadcasting) and the app is free for a year, currently $0.99/ year afterwards.

What's New in Version 2.17.31

• Add color filters to your media. Just capture or select a photo, video, or GIF, and swipe up to pick a filter.
• When you receive multiple photos from the same sender in a row, they'll now be grouped together as an album.
• New reply shortcut: simply swipe right in any message to quickly reply to it.

[...]
Value:
Free
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