Briefly:

Just using a set of cleaner, more readable fonts across the UI.
The font style is the same as used in Stellaris, I created a bunch of variants with minor adjustments to fit into the EU4 interface.

If you like the mod please rate it ...
this makes it more visible in the Workshop for other players to find!

Details:

This originally started out as a tooltip mod attempting to make them more easily readable than with the default font. It now covers most of the UI and will be updated to cover expansions or anything I've missed.

Feel free to point out problems/suggestions in the comments below or on the Paradox forums.

Versions:

Updated for 1.29
Larger tooltips
Standalone mods for old versions (unzip into the EUIV mods folder)
Ironman compatible for achievements

FAQ:

Mod compatibility
Nope, sorry but it's not compatible with Better UI (etc...) and that won't happen as it would take a lot of time to maintain.