> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/core/get-started/readme/api.md).

# Server/Desktop PDF API

Explore the Apryse SDK API with PDF, SDF, and Filters namespaces. Manipulate PDF constructs easily with high-level PDF API or delve into low-level details with SDF API. Learn more about compression an

Select your language or framework to access the full API documentation.

<a href="https://sdk.apryse.com/api/PDFTronSDK/cpp/index.html" class="button primary">C++</a><a href="https://sdk.apryse.com/api/PDFTronSDK/java/packages.html" class="button primary">Java</a><a href="https://sdk.apryse.com/api/PDFTronSDK/python/apryse_sdk.html" class="button primary">Python</a><a href="https://pkg.go.dev/github.com/ApryseSDK/pdftron-go/v2#section-documentation" class="button primary">Go</a><a href="https://sdk.apryse.com/api/pdfnet-node/PDFNet.html" class="button primary">Node.js (JavaScript)</a><a href="https://sdk.apryse.com/api/PDFTronSDK/dotnet/index.html" class="button primary">.NET Framework</a><a href="https://sdk.apryse.com/api/PDFTronSDK/dotnetcore/index.html" class="button primary">.NET/.NET Core</a>

## About the Apryse SDK

The Apryse SDK API is divided into multiple namespaces. The most important are the PDF, SDF, and Filters namespaces.

![](https://3779731113-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fziw3GiL98Xfj63F3He8h%2Fuploads%2Fgit-blob-2825e44d34df2e29d40c2f5a28f553f08fe649d3%2F53ce81cdd398f9ca73befa9b77e5622f86068d4e-227x84.gif?alt=media)

**PDF API** A simple high-level API for manipulating PDF constructs such as pages, interactive forms, bookmarks, graphical elements on the page, and so on.

**SDF API** A powerful low-level API for manipulating every aspect of a PDF document. To use the SDF API, you must be familiar with PDF file structure (documented in the PDF Reference Manual)

**Filters API** A robust utility API that deals with various compression and encryption schemes used in PDF documents. Unless planning to implement a custom encryption or compression scheme in PDF documents, you will only need a very basic knowledge of the filters.


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