# AcroForm

Interactive forms in PDF format are also known as AcroForm. The `AcroForm` class in RadPdfProcessing represents the interactive form in a PDF document and provides the collection of all form fields in a `RadFixedDocument` instance.

> The `AcroForm` class instance is unique for each `RadFixedDocument` instance and can be accessed through the `AcroForm` property of `RadFixedDocument`.

> note You can find complete examples for [Creating Interactive Forms](https://github.com/telerik/document-processing-sdk/tree/master/PdfProcessing/CreateInteractiveForms) and [Modifying Forms](https://github.com/telerik/document-processing-sdk/tree/master/PdfProcessing/ModifyForms) in the SDK repository.

## AcroForm Properties

The `AcroForm` class provides the following properties:

| Property                                    | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| ------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `FormFields`                                | This property is of type [FormFieldCollection](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/interactive-forms/formfieldcollection) and represents the collection of all [FormField](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/interactive-forms/form-fields/formfields) instances. You can use the collection indexer to get a `FormField` instance by name. The `Add()`, `Remove()`, and `Contains()` methods allow you to modify the `FormFields` collection. The `FormFieldCollection` class implements the `IEnumerable<FormField>` interface, which allows you to iterate all fields in the collection. Each `FormField` has a unique name in this collection and you cannot add two fields with the same name. |
| `ViewersShouldRecalculateWidgetAppearances` | A Boolean value that indicates whether the [Widget](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/annotations/widgets) appearances must be recalculated before displaying them in a PDF viewer. If `true`, PDF viewers dynamically reconstruct all widget content based on widget text properties and appearance characteristics. Otherwise, the PDF viewer relies on the `AnnotationContentSource` instances provided by each [Widget](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/annotations/widgets) annotation to render its content in the UI.                                                                                                                                                                    |
| `XfaForms`                                  | Gets a collection of XFA (XML Forms Architecture) forms, which allows you to store and manage form data as a collection of name and byte array pairs. The `XfaCollection` offers the public `Clear` method, which removes all form entries from the collection. (Starting with Q1 2025)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

## See Also

* [FormField](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/interactive-forms/form-fields/formfields)
* [FormFieldCollection](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/interactive-forms/formfieldcollection)
* [PDF Annotation Widgets](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/annotations/widgets)
* [XFA forms and export limitations](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/model/interactive-forms/xfa-forms)
* [Extracting Data from PDF Form Fields Using RadPdfProcessing](https://www.telerik.com/document-processing-libraries/documentation/knowledge-base/extract-pdf-form-fields-data-radpdfprocessing)
* [Resolving Apostrophe Character Being Replaced with Copyright Symbol in Filled PDF AcroForm](https://www.telerik.com/document-processing-libraries/documentation/knowledge-base/apostrophe-character-replaced-copyright-symbol-acroform)