Image
What is a .mj2 file?
A .mj2 file is a MJ2 (Motion JPEG 2000). This is an image format — a picture, drawing or graphic.
How to open a .mj2 file
- GIMP (free) and IrfanView open a very wide range of image formats, including obsolete ones.
- XnView MP is the best bet for unusual or legacy image types.
- Your operating system's built-in viewer may work for mainstream formats.
The registry records this extension against MJ2 (Motion JPEG 2000), so software from that family is the most likely match.
How to convert a .mj2 file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
MIME type
When a .mj2 file travels over the web, servers label it with this MIME type:
video/mj2The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .mj2.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| MJ2 (Motion JPEG 2000) | — | video/mj2 | fmt/337 |