# Settings

`PdfFormatProvider` allows you to export a `RadFlowDocument` to PDF. The provider's `ExportSettings` property controls the export output.

## Export Settings

The `PdfExportSettings` class derives from the `Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export.PdfExportSettings` class related to the [RadPdfProcessing](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/overview) library. The export allows you to control the image quality, encryption, compliance level, and other PDF-related properties. For more information, refer to the [export settings article for RadPdfProcessing](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/formats-and-conversion/pdf/pdfformatprovider/settings).

**Example 1** demonstrates how to export a `RadFlowDocument` instance to PDF and specify that it must be PDF/A compliant.

> tip To specify export settings to the `PdfFormatProvider`, you need to add both the `Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export` and `Telerik.Windows.Documents.Flow.FormatProviders.Pdf.Export` namespaces. In **Example 1** the *Fixed* alias corresponds to the `Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export` namespace.

**Example 1: Apply PdfExportSettings with PdfA2B compliance before exporting the document to PDF**

```C#
Telerik.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider pdf_provider = new Telerik.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider();
Telerik.Documents.Flow.FormatProviders.Pdf.Export.PdfExportSettings settings = new Telerik.Documents.Flow.FormatProviders.Pdf.Export.PdfExportSettings();
settings.ComplianceLevel = Telerik.Documents.Fixed.FormatProviders.Pdf.Export.PdfComplianceLevel.PdfA2B;

provider.ExportSettings = settings;

using (Stream output = File.OpenWrite("sample.pdf"))
{
    RadFlowDocument flow_document = CreateRadFlowDocument();
    provider.Export(flow_document, output, TimeSpan.FromSeconds(10));
}
```

> important The PDF/A standard requires documents to contain all fonts used in them within the document. RadPdfProcessing does not support embedding of the [standard 14 PDF fonts](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/concepts/fonts). Using these fonts prevents the document from complying with the standard.

## Extensibility Manager

The `ExtensibilityManager` property of the `PdfExportSettings` class allows you to extend the currently supported functionality of the `RadFlowDocument` export to PDF.

`ExtensibilityManager` provides an option to control how lists with different `NumberingStyle` options are exported to PDF. You can achieve this by registering a custom implementation of the `INumberingStyleConverter` interface for a concrete `NumberingStyle` enumeration value.

**Example 2** shows how to register a custom `ChineseCountingConverter` class instance that converts a number with `NumberingStyle.ChineseCounting`.

**Example 2: Register a custom ChineseCounting numbering-style converter through the export extensibility manager**

```C#
provider.ExportSettings.ExtensibilityManager.RegisterNumberingStyleConverter(NumberingStyle.ChineseCounting, new ChineseCountingConverter());
```

## See Also

* [PdfProcessing Export Settings](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/formats-and-conversion/pdf/pdfformatprovider/settings)
* [PdfProcessing PDF/A Compliancy](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/concepts/comply-with-pdfa-standard)