> 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/low-level-pdf-api/samples.md).

# Sample for editing PDFs using basic Cos/SDF API on Server/Desktop

Unlock the power of Cos/SDF low-level API to edit PDF files with this informative sample. Learn how to enhance your existing documents effortlessly. The Apryse Server SDK streamlines secure document p

[Cos/SDF low-level API to edit PDF files](/core/get-started/samples/sdftest.md) The sample illustrates how to use basic Cos/SDF API to edit an existing document.


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.apryse.com/core/low-level-pdf-api/samples.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.