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<img width="400" height="163" alt="cpdf logo" src="https://github.com/user-attachments/assets/af9e0a36-4bf3-49e0-b7c0-2534e7e1f0d6" />
Coherent PDF Command Line Tools
===============================
(If you are looking for binaries, there are here: https://www.github.com/coherentgraphics/cpdf-binaries )
CPDF is distributed under the AGPL - see LICENSE.md. If you are unable to abide
by the terms of the AGPL, you will need a commercial license.
For commercial licenses, email
[contact@coherentgraphics.co.uk](mailto:contact@coherentgraphics.co.uk) or
visit [https://www.coherentpdf.com/](https://www.coherentpdf.com/)
Copyright Coherent Graphics Ltd 2026.
Keep up to date by joining the very low volume cpdf-announce mailing list:
https://groups.google.com/g/cpdf-announce/
This code builds two things:
a) The CPDF PDF command line tool for editing PDF files.
b) cpdf as an OCaml library, for which documentation is here:
[https://coherentpdf.com/cpdf/](https://coherentpdf.com/cpdf/)
Prerequisites to build
----------------------
The OCaml compiler
[http://ocaml.org](http://ocaml.org)
The camlpdf library
[http://github.com/johnwhitington/camlpdf](http://www.github.com/johnwhitington/camlpdf)
The ocamlfind library manager
[http://projects.camlcity.org/projects/findlib.html](http://projects.camlcity.org/projects/findlib.html)
If you are using the OPAM package manager:
[http://opam.ocamlpro.com](http://opam.ocamlpro.com)
these can be installed by:
```
opam install camlpdf
```
To build
--------
If downloading from Github, obtain the correct source. This means choosing the
tag for a particular version, such as "v2.9". The head of the master branch
is unstable.
1. Type `make` to make the cpdf executable and the library
2. Type `make install` to install the OCaml cpdf library.
The `cpdf` executable should be manually placed somewhere suitable.
Alternatively, the library and command-line binary can be installed by
```
opam install cpdf
```
Package management
• OPAM CamlPDF / CPDF
• Debian
• Fedora
• Homebrew
• Winget
• Choco
Documentation
-------------
The file `cpdfmanual.pdf` in this folder is the documentation for the command
line tools. The documentation for the cpdf OCaml library is in `doc/html/cpdf/`
in this folder once the library has been built.
C API
-----
A C interface to cpdf is available, in source and binary form:
[https://github.com/johnwhitington/cpdflib-source](https://github.com/johnwhitington/cpdflib-source)
[https://github.com/coherentgraphics/cpdflib-binary](https://github.com/coherentgraphics/cpdflib-binary)
Python API
----------
A Python interface to cpdf is available:
[https://pypi.org/project/pycpdflib](https://pypi.org/project/pycpdflib)
Java API
--------
A Java interface to cpdf is available:
[https://github.com/coherentgraphics/jcpdf](https://github.com/coherentgraphics/jcpdf)
.NET API
--------
A .NET interface to cpdf is available:
[https://github.com/coherentgraphics/dotnet-libcpdf](https://github.com/coherentgraphics/dotnet-libcpdf)
JavaScript API
--------------
A JavaScript version of cpdf, for server and client side is available:
Distribution: [https://www.npmjs.com/package/coherentpdf](https://www.npmjs.com/package/coherentpdf)
Source: [https://github.com/coherentgraphics/coherentpdf.js](https://github.com/coherentgraphics/coherentpdf.js)
Acknowledgments
---------------
The file [cpdfxmlm.ml](cpdfxmlm.ml) was written by Daniel Bünzli.
The file [cpdfyojson.ml](cpdfyojson.ml) was written by Martin Jambon and others.
Unicode Data Files are under the Unicode Inc. License agreement.
The error descriptions for -verify "PDF/UA-1(matterhorn)" come from the PDF
Association, and are licensed under the Creative Commons Attribution 4.0
International license.
PDF/UA support in Cpdf was implemented under NLnet grant 2023-12-031.
Contact
-------
[contact@coherentgraphics.co.uk](mailto:contact@coherentgraphics.co.uk)
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