dxf to tiff conversion is doable, in the sense it is possible to create TIFF raster image of the DXF vector design. But of course the resulting file will be just a picture, not really suitable for CAD purposes anymore, but good enough for sharing as picture.
There are numerous ways how to do this, you just need a software that can view .dxf files. Export to JPG or TIFF is usually included, but pretty much any raster format will do. You can always save it to another format with standard graphics editor.
Updated: October 27, 2023