Hi,
Here’s what I’ve been using successfully on an offline wiki where I can’t install the font on the system:
To convert the ttf/woff/woff2 file to base64 I use Webfont Generator or Woff2Base.
I then paste the resulting base64 code into a new tiddler tagged $:/tags/Stylesheet and use it in another stylesheet like any other font.
Here is an example. Warning: it will redefine every title font in your wiki, try it on tiddlywiki.com first!
roboto-titles.json (29.1 KB)
Test tiddler:
! Title1
!! Title2
Normal text...
Fred