UniDoc is a comprehensive PDF library for Go (golang). The library has advanced capabilities for generating, processing and modifying PDFs. UniDoc is written and supported by the owners of the FoxyUtils.com website, where the library is used to power many of the PDF services offered.
Check out the Getting Started and Example sections, which showcase how to install UniDoc and provide numerous examples of using UniDoc to generate, process or modify PDF files. https://unidoc.io/examples/getting_started/
The godoc for unidoc provides a detailed breakdown of the API and documentation for packages, types and methods. https://godoc.org/github.com/unidoc/unidoc
The API is composed of a few major packages:
- common: Provides common shared types such as Logger and utilities to check license validity. - pdf/core: The core package defines the primitive PDF object types and handles the file reading I/O and parsing the primitive objects. - pdf/model: The model package builds on the core package, to represent the PDF as a structured model of the PDF primitive types. It has a reader and a writer to read and process a PDF file based on the structured model. This serves as a basis to perform a number of numerous tasks and can be used to work with a PDF in a medium to high level interface, although it does require an understanding of the PDF format and structure. - pdf/creator: The PDF creator makes it easy to create new PDFs or modify existing PDFs. It can also enable loading a template PDF, adding text/images and generating an output PDF. It can be used to add text, images, and generate text and graphical reports. It is designed with simplicity in mind, with the goal of making it easy to create reports without needing any knowledge about the PDF format or specifications. - pdf/extractor: Package extractor is used for quickly extracting PDF content through a simple interface. Currently offers functionality for extracting textual content.
|common||Package common contains common properties used by the subpackages.|
|common/license||The license package helps manage commercial licenses and check if they are valid for the version of unidoc used.|
|pdf/annotator||The annotator package contains an annotator with a convenient interface for creating annotations with appearance streams.|
|pdf/contentstream||The contentstream package provides functionality for parsing and creating content streams for PDF files.|
|pdf/contentstream/draw||The draw package has handy features for defining paths which can be used to draw content on a PDF page.|
|pdf/core||Package core defines and implements the primitive PDF object types in golang, and provides functionality for parsing those from a PDF file stream.|
|pdf/creator||Package creator is used for quickly generating pages and content with a simple interface.|
|pdf/extractor||Package extractor is used for quickly extracting PDF content through a simple interface.|
|pdf/model||The model package provides a convenient interface for reading, writing and working with PDF files.|
|pdf/ps||Package ps implements a small subset of the postscript language used in PDF for type 4 functions.|