How to open UMLJ files

Did your computer fail to open an UMLJ file? We explain what UMLJ files are and recommend software that we know can open or convert your files.

What is an UMLJ file?

UMLJ files are StarUML project file files, which you can read more about below.

The UMLJ file extension indicates to your device which app can open the file. However, different apps may use the same file extension for different types of data. So an UMLJ opener may not be able to open all kinds of UMLJ files. In this case, though, we only know of one specific use.

StarUML project file

StartUML project file. StarUML is a sophisticated software modeler aimed to support agile and concise modeling. It is used to create data-flow diagrams and entity-relationship diagrams. The UMLJ file contains project settings for a user-generated project.

Software that will open, convert or fix these specific UMLJ files

StarUMLStarUMLVerified
We have not verified any programs that we know for certain can work with UMLJ-files on Mac. If you know one, please use the Suggest link below and tell us about it!
We have not verified any online services that we know for certain can work with UMLJ-files. If you know one, please use the Suggest link below and tell us about it!