Image
What is a .jls file?
A .jls file is a JPEG-LS. This is an image format — a picture, drawing or graphic.
How to open a .jls 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 JPEG-LS, so software from that family is the most likely match.
How to convert a .jls file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .jls.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| JPEG-LS | — | — | fmt/150 |