How to Open and Convert MOS Files

Screenshot of several MOS files in Windows 10 that open with Adobe Photoshop

Tim Fisher

A file with the MOS file extension is a Leaf Raw Image file produced by cameras such as the Leaf Aptus series.

MOS files are uncompressed, so they're typically a bit larger than most image files.

How to Open an MOS File

Microsoft Windows Photos (built-in to Windows) is one free MOS viewer, but the file can also be opened with paid programs like Adobe Photoshop, Corel PaintShop Pro, and Phase One Capture One.

Mac users can view an MOS file with ColorStrokes, in addition to Photoshop and Capture One.

RawTherapee is another free program that might be able to open MOS files on Windows and macOS.

Tip: If you find that an application on your PC does try to open the MOS file but it's the wrong application or if you would rather have another installed program open MOS files, learn how to change the default program for a specific file extension in Windows.

How to Convert an MOS File

Most, if not all, of the programs above that can open MOS files can most likely convert them, too. Just open the MOS file in one of those programs and then look for a File > Save As, Convertor Export menu option.

If you try converting the MOS that way, you can most likely save it to formats like JPG and PNG.

Another option would be to use a free image file converter. However, there doesn't seem to be many that support the MOS format. If you need to convert MOS to DNG, you can do so with Adobe DNG Converter.

Still Can't Open the File?

Be careful to not confuse another file format for an MOS file. Some files use similar looking file extensions even though the formats are unrelated.

MODD files are one example. If you really have a MODD file, follow that link to learn more about the format and what programs are able to open it. The same programs that open MOD files are not used to open MOS files, and vice versa.