Preview attachments in Outlook

What does it mean to preview a file in Outlook?

File preview allows you to view attachments in Outlook without opening the attachments in a separate window. You simply click the attachment icon in the Reading Pane to preview the file. 

Note: You cannot preview PDF files if you're using Conversational view. For more information on Conversational view, see Learn more about Conversational view.

What files can I preview?

By default, you can preview files from most Microsoft Office/Office 365 programs including Word, PowerPoint, Excel, and Visio. You can also preview attached Outlook email items, images, and text files. 

How can I preview PDF files?

Outlook doesn't include a built-in PDF previewer. In order to preview PDF files, use the following steps.

1. Close Outlook.

2. Download and install Adobe Acrobat Reader.

3. Make Adobe Acrobat Reader the default program used to open PDF files. Select your operating system below for detailed instructions.

   • Windows 7 and 8

   • Windows 10

4. Restart Outlook. You should now be able to preview PDF files in Outlook.

Can I turn off file preview?

Yes. You can enable or disable the ability to preview files in the Trust Center. 

1. In Outlook, select File > Options > Trust Center > Trust Center Settings, and then select Attachment Handling.

   Note: In Outlook 2007, select Tools > Trust Center > Attachment Handling.

2. To turn off all attachment previewers, click Turn off Attachment Preview.

3. To turn off  a specific attachment previewer, click Attachment and Document Previewers, clear the check box for a previewer you want to turn off, and then click OK.

Third-party attachment previewers

Third-party software vendors may provide their own previewers that support additional attachment file types; you can use your Web browser to search the Web to find additional information. When available, you can download and install previewers to preview additional file types in Outlook.

To help protect you from malicious code, active content embedded in attachments (including scripts, macros, and ActiveX controls) is disabled during a preview. You should preview or open attachments from trustworthy sources only.

Still using Outlook 2007? Try the latest version of Outlook

For additional file previewers, try the latest version of Outlook.