.QT File Extension

.QT File Extension

File Type

Apple QuickTime Movie

Developer Apple
2.9  |  31 Votes
Category Video Files
Format Binary

What is a QT file?

A QT file is a movie file saved in the QuickTime File Format (QTFF), which is a multimedia container format developed by Apple. It contains one or more audio, video, or text (subtitle) tracks and typically uses the MPEG-4 codec for compression. QT files are most often used for storing movies.

More Information
Screenshot of a .qt file in Apple QuickTime Player 10.5
QT file open in Apple QuickTime Player 10.5

The QTFF was developed and released by Apple in 1991, and led to the formation of the MPEG-4 standard. It is designed to support various types of media in order to accommodate the transfer of multimedia between applications, operating systems, and devices.

Video files saved in the QTFF may use the .qt or .mov file extensions. However, .MOV files are much more common than QT files. Since MOV and QT files often store video compressed with the MPEG-4 codec, they are commonly interchanged with .MP4 video files.

More information about the QuickTime File Format

QTFF is object-oriented and is forward-compatible, allowing it to support new object types introduced over time. The format supports media data, which is the video, audio, or text data, and metadata, which includes the media compression utilized, timing information, number of media tracks, and an index of where the media data is located.

How do I open a QT file?

You can open QT files with various multimedia players, such as Apple QuickTime Player (Mac) and VLC media player (cross-platform).

You can also play QT files in Android and iOS with VLC for Android and VLC for iOS.

Open and view .QT files with File Viewer Plus.Free Download

Programs that open or reference QT files

Updated January 19, 2021

Verified by FileInfo.com

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