FontisanUniversal font processing library for Ruby

Why Fontisan? ​

Fontisan is the most comprehensive font processing library in pure Ruby, combining the capabilities of:

• fonttools (Python) — 100+ OpenType tables, variable fonts, subsetting
• lcdf-typetools (C++) — otfinfo, cfftot1, Type 1 validation
• Font-Validator (C#) — Comprehensive validation with coverage reports

The key differentiator: Fontisan is 100% pure Ruby. No Python, no C++, no C# dependencies. Install and run anywhere Ruby runs.

Feature Comparison ​

See full comparison →

CLI Usage ​

# Get font information
fontisan info font.ttf

# Convert fonts
fontisan convert input.ttf --to otf --output output.otf

# Validate fonts
fontisan validate font.ttf --profile google_fonts

# Work with collections
fontisan unpack fonts.ttc --output-dir ./extracted

Ruby API ​

require 'fontisan'

# Load any font format
font = Fontisan::FontLoader.load('font.ttf')

# Get font information
info = Fontisan::Commands::InfoCommand.new(font: font).run
puts info.family_name
puts info.style

# Convert between formats
Fontisan::FontWriter.write(font, 'output.woff2')

# Validate a font
result = Fontisan::FontValidator.validate('font.otf', profile: :google_fonts)
puts result.passed?

Migration Guides ​

Coming from another tool? We have migration guides:

• From fonttools (Python) — Comprehensive Python to Ruby migration
• From extract_ttc — Already fully compatible
• From otfinfo — Command equivalents for lcdf-typetools
• From Font-Validator — Validation profile mapping

License ​

Fontisan is open source and available under the MIT License.