Custom UI Editor 3.1

Custom UI Editor by Microsoft Corporation is a lightweight utility for creating and editing RibbonX (Custom UI) markup in Microsoft Office documents. It lets you add or modify custom tabs, groups, and controls in Open XML–based files without opening Office, making it easy to design consistent, branded experiences across Word, Excel, and PowerPoint.

Key features:

• Directly edit and manage RibbonX XML (customUI and customUI14 parts)
• Add custom tabs, groups, buttons, and context menus
• Embed and reference custom images for Ribbon controls
• Validate XML against the appropriate schema to catch errors early
• Target multiple Office hosts and versions in a single file
• Work with Open XML formats such as .docx, .xlsx, .pptx, .docm, .xlsm, and .pptm
• Ideal for developers and IT pros building solutions with VBA, VSTO, or COM add-ins

With its focused toolset and simple workflow, Custom UI Editor streamlines Ribbon customization and helps you package UI changes directly into your Office documents for reliable deployment.

Custom UI Editor is developed by Microsoft. The most popular version of this product among our users is 3.1. The name of the program executable file is CustomUIEditor.exe.