Copy TrueType instructions from a binary font to a UFO.
Project description
inst2ufo – Copy TrueType instructions from a binary font to a UFO
Glyphs Hinting To UFO Workflow
Convert the UFO from cubic to quadratic curves and save it as tt.ufo:
fonttools cu2qu --keep-direction ps.ufo -o tt.ufo
Open tt.ufo in Glyphs, save it as a Glyphs file (because TrueType instructions don't persist in a UFO saved by Glyphs) and hint it using the TrueType Instructor tool.
Export a TTF font from Glyphs. Don't remove overlaps while exporting.
Copy the instructions from the TTF back to the UFO:
inst2ufo -g myfont.ttf tt.ufo
The -g option causes the UFO to be modified to match the contours exported to the TTF by Glyphs. If you modify the hinting in the Glyphs file and export the TTF again, update the instruction code in the UFO by running the command without the -g option:
inst2ufo myfont.ttf tt.ufo
Now you can generate a font with instructions from the UFO using fontmake:
fontmake -u tt.ufo -o ttf --keep-direction --keep-overlaps --output-path myfont-hinted.ttf
If you need to remove TrueType instructions from a UFO, you can use this command:
rmufoinst tt.ufo
Copyright
© 2026 by Jens Kutílek
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