You can specify a different format for a Visualforce page by using the ContentType attribute on the <apex:page> tag.
The ContentType attribute takes a Multipurpose Internet Mail Extension (MIME) media type as a value, such as application/vnd.ms-works, audio/mpeg or image/gif. For more information about valid MIME media types, see http://www.iana.org/assignments/media-types/.
To display Visualforce page data in a Microsoft Excel spreadsheet, use the contentType attribute on the <apex:page> tag, and specify a value of application/vnd.ms-excel.
For example, the following page builds a simple list of contacts. It is a simplified version of the example shown in Building a Table of Data in a Page:
<apex:page standardController="Account"> <apex:pageBlock title="Contacts"> <apex:pageBlockTable value="{!account.Contacts}" var="contact"> <apex:column value="{!contact.Name}"/> <apex:column value="{!contact.MailingCity}"/> <apex:column value="{!contact.Phone}"/> </apex:pageBlockTable> </apex:pageBlock> </apex:page>
To display this page in Excel, add the contentType attribute to the <apex:page> tag, as follows:
<apex:page standardController="Account" contenttype="application/vnd.ms-excel"> <apex:pageBlock title="Contacts"> <apex:pageBlockTable value="{!account.Contacts}" var="contact"> <apex:column value="{!contact.Name}"/> <apex:column value="{!contact.MailingCity}"/> <apex:column value="{!contact.Phone}"/> </apex:pageBlockTable> </apex:pageBlock> </apex:page>
If the page does not display properly in Excel, try a different content-type, such as text/rtf.