Vanilla Stellaris basic fonts (small) is too blurry. Anti-aliasing for such small fonts is exсessive. Blurry is bad for eyes. This mod fix this.

Put this files from archive:
arial17n.fnt
arial17n.tga
arial20b.fnt
arial20b.tga

to game folder: \Stellaris\gfx\fonts\

file from archive:
fonts.gfx (make backup this file)

to game folder: \Stellaris\gfx\fonts\

(fonts.gfx version of Stellaris Galaxy Edition.v3.14.15 (probably it would work with future versions of the game).)

Now you have sharp small basic fonts.

Also you can extract all fonts from archive folder JustSharpFonts to \Stellaris\gfx\fonts\  (overwright vanilla files(make backup this files)).
This add some sharpness for some texts but make text a bit ugly but sharp. Use only if you preferred sharp instead good anti-aliasing lines in fonts.
You can try but make sure that you have backup, so you can revert to vanilla fonts back.