How can I make a font with an outline?

To add an outline to your custom font:

  1. Import your desired font (see here for importing).
  2. In the font editor, select the page(s) of font you want to modify.
  3. Click ‘Export’ and choose a destination for the exported file (the file will export as a .tga).
  4. Open and modify the .tga in your editor of choice (I use Gimp).
  5. After making all of your modifications, in the UE4 font editor click ‘Update’ and select your just modified .tga.