多種作業系統都可用的PDF工具：PDFtk

超了不起的PDF工具！我還沒試過不過光看他的功能還有支援的平台就覺得超棒！Windows, Linux, Mac OS X, FreeBSD and Solaris.
Keep one in the top drawer of your desktop and use it to:
* Merge PDF Documents
* Split PDF Pages into a New Document
* Decrypt Input as Necessary (Password Required)
* Encrypt Output as Desired
* Fill PDF Forms with FDF Data and/or Flatten Forms
* Apply a Background Watermark
* Report on PDF Metrics such as Metadata, Bookmarks, and Page Labels
* Update PDF Metadata
* Attach Files to PDF Pages or the PDF Document
* Unpack PDF Attachments
* Burst a PDF Document into Single Pages
* Uncompress and Re-Compress Page Streams
* Repair Corrupted PDF (Where Possible)

Pdftk allows you to manipulate PDF easily and freely. It does not require Acrobat, and it runs on Windows, Linux, Mac OS X, FreeBSD and Solaris.