I have a JGW file to add some cropmarks. I have tried adding it as a vector or raster file but it comes up with unsupported data each time. Does anyone recognise this file type and how to load it?
A JGW file is a JPEG world file. It tells QGIS, or another GIS program where in the world the JPEG should be placed.
For you to use the JGW file in QGIS it simply needs to have the same base name and be in the same folder as the JPEG and it will be used when you load in the JPEG file.
Then you can add in the JPEG file into QGIS using the add raster layer functionality (or simply drag and drop it in) and QGIS will use the JGW automatically to show the JPEG in the correct location.