The Coherent PDF Command Line Tools and C/C++/Python/.NET/Java/JavaScript API allow you to manipulate existing PDF files in a variety of ways. For example:

- Merge PDF files together, or split them apart
- Encrypt and decrypt
- Scale, crop and rotate pages
- Read and set document info and metadata
- Copy, add or remove bookmarks
- Read, write and modify annotations
- Put multiple pages on one (imposition)
- Stamp logos, text, dates, page numbers
- Add or remove attachments
- Losslessly compress PDF files
- Convert PDF files to and from JSON
- Draw shapes and text on PDF files
- Create and modify PDF/UA and PDF/UA-2 documents