> 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/uwp/annotation/export.md).

# Export annotations in UWP

Extract data from PDF to FDF, export FDF as XFDF, and fill PDF forms with ease using our comprehensive guide. Learn how to merge and extract form data efficiently. The Apryse uwp SDK streamlines secur

To extract data from PDF to FDF, then export FDF as XFDF

{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}

```csharp
PDFDoc doc = new PDFDoc(fileName);

// Extract annotations to FDF.
// Optionally use e_both to extract both forms and annotations
FDFDoc documentFields = doc.FDFExtract(PDFDocExtractFlag.e_annots_only); //PDFDocExtractFlag.e_forms_only

// Export annotations from FDF to XFDF.
await documentFields.SaveAsXFDFAsync(outputXfdfFileName);

// Optionally write XFDF to a string
String xfdfString = documentFields.SaveAsXFDFString();
```

{% endcode %}
{% endtab %}
{% endtabs %}

[PDF Form Fill and Form Data Extraction](/uwp/get-started/samples.md#fdf) Full sample code which illustrates basic FDF merge/extract functionality and full support for FDF (Forms Data Format)


---

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