MPEG-21 multimedia file
File type: Digital video and movie file
The .mp21 file extension identifies an MPEG-21 multimedia file. MPEG-21 is an open framework for creating, delivering, and consuming multimedia content.
An MP21 file is a multimedia container that can store related digital media data.
File type category:
Digital video and movie file
Date updated: October 2, 2026
The MP21 file extension is associated with MPEG-21, a standard developed by the Moving Picture Experts Group (MPEG). The standard defines an open framework for end-to-end multimedia applications.
An MP21 file acts as a container for multimedia data and may package content intended for delivery and playback as part of an MPEG-21 application.
QuickTime Player is the software associated with MP21 files on Microsoft Windows and Apple macOS or Mac OS X.
Try opening the .mp21 file with QuickTime Player on Microsoft Windows or with QuickTime Player for Mac on Apple macOS or Mac OS X.
In the player, use the file-open command and select the MP21 file. If the file does not open, the installed version may not support this MPEG-21 content or the file may be incomplete.
Conversion depends on the multimedia content and MPEG-21 packaging in the file.
If QuickTime Player opens the file, its export function may allow the playable media to be saved in another format. Such an export may omit MPEG-21-specific packaging, metadata, or rights information.
Apps designed for playing mp21 files:
Apple macOS / Mac OS X
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