Pdftk is a simple tool for doing everyday things with PDF documents.
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, including Metadata and Bookmarks
- 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)