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Optimizely PDF Preview

Describes the Optimizely PDF Preview add-on, which lets editors preview PDF documents in edit view.

When accessing the edit view in Optimizely Content Management System (CMS), you can select a PDF document from a media folder to preview its content.


In the PdfPreview package, there is a class named PdfFile which handles uploaded files with the .pdf extension.


  • No additional license fee for the add-on.
  • An Optimizely Content Management System (CMS) website with the EPiServer.PdfPreview package installed.
  • See Add-ons platform compatibility for package and version information. 


  • Installed through NuGet.

PDF Preview is useful for websites where you manage multiple content items in PDF format.

User scenarios

These are the typical user scenarios for adding PDF preview to your solution.

The system does not have a model for handling PDF files

If the system does not have a model for handling PDF files, the default PdfFile model provided by the package is used. Editors can now preview PDF files in edit view without any extra steps.

The system already has a model for handling PDF files

By default, the ContentMediaResolver class from CMS Core gets the first matching media implementation type registered for an extension. If there is an existing type registered for “pdf”, the PdfFile media implementation in the Optimizely package is used, but in this case, the existing type should be chosen.

To change this default behavior, a media resolver class named PdfContentMediaResolver is used to ignore the PdfFile type in the Optimizely package; thus, the existing registered media type is the candidate.

PdfContentMediaResolver inherits ContentMediaResolver and overrides the Type GetFirstMatching(string extension) method to handle the business logic above.

To turn on the PDF preview, the PDF media model must implement the IPdfFile interface. For example:

[ContentType(DisplayName = "PdfFile", GUID = "…", Description = "")]
[MediaDescriptor(ExtensionString = "pdf")]
public class PdfFile: MediaData, IPdfFile {}



Due to limitations, after installing the add-on, you can preview only newly uploaded PDFs. You must upload existing PDFs again to be previewed.