You can use Google Fonts in Showit and if you have a custom font you would like to use, you can use a service like Font Squirrel to create a .woff font file that you can upload to Showit and use for your design.  

**Note: Be sure to add your converted .woff file to your media library, just as you would add an image. Only then will the custom font be available on the drop-down menu in the design settings. If needed - how to upload to your media library**

The following video walks you through that process:

Another available font conversion tool is Transfonter.
* If using Transfonter, Turn off Family Support and convert to WOFF format (not WOFF2)

More Help Articles 

Custom Icons
Google Fonts
Design Settings

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