I have created a tool to convert TrueType Font (.ttf), OpenType Font (.otf) to Playdate Font (.fnt + .png).
PDFontTool
https://github.com/abenokobo/PDFontTool
This tool was created for the purpose of using bitmap fonts containing Kanji characters in Playdate.
Not only bitmap fonts, but also outline fonts can be converted somewhat cleanly, so it would be interesting to experiment with different types of fonts.
Unfortunately, it is Windows-only, since it uses Windows APIs.
This is great! Thank you.
I reported some small issues on GitHub.
And I used it to convert a font in a quick "clock" project: Matt's Prototypes - #133 by matt
This is great! Exactly what I was looking for since this is missing in Caps!
This just came in super handy - thanks!
Reminder that fonts often come with licensing requirements. If you use one in your game, make sure you aren't using it illegally.
you are my hero. Spent the past 30 minutes looking for the import button in caps since it was written in the documentation that it was available 
Thank you so much for the program. I have never run a prompt like this before so I made an
instructions page to help people in the future.
Thank you for your attention to detail!
Thanks to this explanation, even people who don't normally use the command prompt will be able to use PDFontTool!
Great tool, thanks for the effort!
Any chance for a port to macOS/Linux?
Edit: Just saw the line at the end of the README 
