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.UI File Extension

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File TypeUser Interface File

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Rare Uncommon Average Common Very Common
CategoryDeveloper Files


This file is saved in an XML format. You can view the XML structure and contents of the file in a text editor.


Stores the user interface configuration for a program; saved in an XML format and contains definitions of Qt widgets with slots and signals; can be viewed in a basic text editor or opened with a UI designer program.

More Information

UI files can be created using Qt Designer and Qt Creator, which are part of the Qt SDK.

NOTE: Qt SDK was previously developed by Nokia before Digia acquired the software.

Programs that open UI files
Digia Qt SDK
Any text editor
Digia Qt SDK
Any text editor
Digia Qt SDK
Any text editor
Updated 10/14/2014

FileInfo - The File Extensions Database

This page contains information about the .UI extension and its known file associations. Our goal is to help you understand what a UI file is and how to open it.

The User Interface file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and therefore do not publish any information we have not verified.

If you would like to suggest any additions or updates to this page, please let us know!