| Pdfe | Errors |
| Pdfutil | General functions |
| Pdfio | Generic Input/Ouput from/to channels, strings, files etc. |
| Pdftransform | Affine Transformations in Two Dimensions |
| Pdfunits | Units and Unit Conversion |
| Pdfpaper | Media Sizes |
| Pdfcryptprimitives | Generic encryption primitives for ARC4, AES and the SHA family of digests |
Representing PDF Files in Memory | |
| Pdfcrypt | Decrypting PDF files |
| Pdfflate | Interface to miniz.c via Zlib-like functions |
| Pdfcodec | Encoding and Decoding PDF Streams |
| Pdfwrite | Writing PDF Files |
| Pdfgenlex | A very fast lexer for very basic tokens |
| Pdfread | Reading PDF Files |
| Pdfjpeg | PDF JPEG support |
| Pdfops | Parsing PDF Graphics Streams |
| Pdfdest | Destinations |
| Pdfmarks | Bookmarks |
| Pdfpagelabels | Page Labels |
| Pdftree | Name and Number Trees |
| Pdfst | Structure trees |
| Pdfpage | Page-level functionality |
| Pdfannot | Annotations |
| Pdffun | Parsing and Evaluating PDF Functions. |
| Pdfspace | Colour Spaces |
| Pdfimage | Extract Images |
| Pdfafm | Parse Adobe Font Metrics files |
| Pdfafmdata | AFM Data for the standard 14 fonts |
| Pdfglyphlist | Glyph Lists |
| Pdftext | Parsing fonts and extracting text from content streams and PDF strings |
| Pdfstandard14 | Standard PDF Fonts |
| Pdfdate | Representing and Parsing PDF Dates |
| Pdfocg | Optional Content Groups. |
| Pdfmerge | Merge PDF files |