Content Preview Vs Render Preview:
Content Preview shows how your email will appear to any contact. You can see the preview based on a specific contact by entering their a contact (email address). Render Preview shows how your email will appear in various email clients.
Content Preview
On the Email Content index page, either click the content name, or go to the Actions drop-down list for the content, and select Preview Content. Here, on the PREVIEW tab, you can see the email preview.

Previewing Based on User
You can see the content preview based on any specific user. You can specify the contact and see how the content will look to them.
There are two ways you can select a user to see the preview:
- Preview By Contact: Enter the email address and click the search icon. If you enter an email address that's not in your contact list, then you'll get an error message stating that the contact doesn't exist.
- Preview By List: Select a list and then select a contact from the list.

Previewing Based on Dynamic Block
If you have dynamic blocks in your content, you'll automatically see the filter option to see the preview based on dynamic content. If an email content has dynamic blocks, then the preview shows the original content by default. Then, once you select an option from the Dynamic Block drop-down, the preview is rendered with the content based on the selected option.

Render Preview
On the email preview page, Click the RENDER PREVIEW button to preview your email on various email clients. Marketing Cloud supports previews for web, mobile, and application-based email clients.
