SharePoint Designer file
File type: Various data file
A .spdesignmaster file is a SharePoint Designer file associated with Microsoft's SharePoint Designer web design software.
It belongs to the legacy file formats used when creating or modifying Microsoft SharePoint sites and web pages.
File type category:
Various data file
Date updated: September 27, 2026
Office SharePoint Designer is a Microsoft Windows application for designing and customizing SharePoint sites. It includes tools for editing site pages and other SharePoint web content.
A .spdesignmaster file stores SharePoint Designer data associated with a SharePoint site design. It is intended for use within SharePoint Designer rather than as a general-purpose HTML document.
This is a legacy format associated with the discontinued SharePoint Designer product.
Open a .spdesignmaster file with Office SharePoint Designer on Microsoft Windows. If the file is part of a SharePoint site, open it from the corresponding site or project in SharePoint Designer rather than treating it as an ordinary web page.
Open the file in Office SharePoint Designer and use the application's site or page editing features to preserve or export the relevant SharePoint content where supported.
Because this is a legacy design file, conversion may require reconstructing the site design in another SharePoint or web-design tool.
Software applications that handle other tasks involving spdesignmaster files:
Microsoft Windows
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