This freeware lives up to its claims of customizing viewing preferences for PDF files, though some of its features already come standard with Adobe Acrobat and Reader. Tweak PDF is an executable program that offers a very straightforward interface. The program lets you specify initial viewing preferences and rearrange pages into single- and dual-column or single-page layout. With one click, PDF files made with older software versions can be converted into the newer version, and Tweak allows you to edit the PDF metadata, such as title, subject, keywords, and author.
We also tested an extra feature that compresses PDF files using Flate and Run-length algorithms, and it worked well. However, even Adobe Reader will let you customize viewing preferences and add keywords to the metadata. Even so, Tweak PDF costs you nothing, and could prove useful to anyone who works often with PDF documents.