glyphslib

library6.13.1pypypi✓ verified 79d ago

A Python library that bridges Glyphs source files (.glyphs) to UFOs (Unified Font Object) and back. It converts .glyphs files into UFO packages for further processing (e.g., with fontmake) and can also write back to .glyphs format. The current version is 6.13.0, with a relatively active release cadence (multiple minor releases per year). Requires Python >= 3.10.

data

pip install glyphslib

github ↗package ↗

INSTALL

IMPORT

SIG · GLYPHSLIB

glyphslib

datapythonv6.13.1

Install

3.3s avg

Import

—

Disk

56MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v6.13.1 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.000s · 56.9MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 3.3s · import 0.000s · 57MB

56MB installed

● package 56MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

GSGlyphsFile

✓ from glyphsLib import GSFont

✗ from glyphsLib import GlyphsFile

Load a .glyphs file and convert it to UFOs using the high-level API.

from glyphslib import load, to_ufos # Load a .glyphs file glyphs_data = load('MyFont.glyphs') # Convert to UFO fonts (list of UFO objects for each master) ufo_fonts = to_ufos(glyphs_data) # Now you can work with UFOs using fontTools or ufoLib2 for ufo in ufo_fonts: print(ufo.info.familyName)

Debug

Known issues

breakingVersion 6.0.0 dropped support for Python 3.9 and earlier. If you are on an older Python, you must use an older version of glyphsLib.

fix

Upgrade to Python 3.10+ or pin to glyphsLib <6.0.0 (e.g., pip install 'glyphslib<6').

affects: >=6.0.0

gotchaThe .glyphs file format (v2 vs v3) is auto-detected, but some custom parameters or new features in Glyphs 3 may not be fully supported. Always check for warnings or errors during conversion.

fix

Use the `validate` function or inspect the logs for unsupported features.

affects: all

deprecatedThe `glyphslib.glyphs` submodule (direct .glyphs file parsing) is being deprecated in favor of the higher-level API in `glyphslib` package itself.

fix

Use `from glyphslib import load` instead of `from glyphslib.glyphs import load`.

affects: >=6.0.0

gotchaWhen converting back to .glyphs (using `to_glyphs`), some UFO features like kerning exceptions or OpenType lookups may not round-trip perfectly. Always verify output.

fix

Check the generated .glyphs file in Glyphs.app for fidelity.

affects: all

Upgrade

Version history

6.13.1latest on PyPI · released Apr 28, 2026

Audit

Dependencies

fonttoolsrequiredCore dependency for UFO and font operations

ufoLib2requiredUFO reading/writing

protobufrequiredUsed for .glyphs file parsing

Agent activity

26 hits · last 30 days

node

Resources

githubhttps://github.com/googlefonts/glyphsLib ↗

packagehttps://pypi.org/project/glyphslib/ ↗