I need to upload my doc to a Print on Demand service and they want a PDF/X or, preferably, PDF/X-1a, with the fonts embedded. Can I do this in Writer? I can’t figure out how.
Click File - Export as - Export as PDF . In the dialogue box that opens go through the tabs to make sure you have selected all the options you need.
Note that not all fonts can be embedded, some have licensing restrictions that prevent embedding.
Check your exported pdf in Adobe reader, in particular File - Properties - Fonts to see off all fonts embedded. If you are using standard fonts it shouldn’t be an issue