> 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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