MJ2 File

What are MJ2 files and how to open them

Are you having problems opening a MJ2 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your MJ2 files.

What is a MJ2 file?

A .MJ2 file is a Motion JPEG 2000 Video file.

Motion JPEG 2000 Video is a file type defined by the ISO/IEC standard (Part 3 of JPEG 2000, ITU-T Recommendation T.802) for storing digital video sequences where each frame is encoded separately using JPEG 2000. It is used to save high-quality video with optional audio, preserving each individual frame independently rather than compressing changes between frames.

This format is created by software or hardware that implements the JPEG 2000 codec under the MJ2 standard. After creation the file can be played back by compatible video players and used for archiving, editing, or preservation, especially when lossless compression or frame-accurate seeking is required. It supports either lossy or mathematically lossless JPEG 2000 encoding for the video frames.

Files begin with a specific header signature: the first 12 bytes are 00 00 00 0C 6A 50 20 20 0D 0A 87 0A and at offset 16 the ASCII string "ftypmjp2" appears. These identify the file as Motion JPEG 2000 (MJ2 or MJP2) in the ISO base media file format.

How to open MJ2 files

We have identified one MJ2 opener that is compatible with this specific type of MJ2 file.

Programs that open Motion JPEG 2000 Video files

Last updated: August 9, 2026

Various apps that use files with this extension

These apps are known to open certain types of MJ2 files. Remember, different programs may use MJ2 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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