Batch Font Conversion: Complete Automation Guide

• Website migration: Convert 50+ TTF/OTF files to WOFF2 + WOFF for web deployment
• Font library preparation: Generate multiple formats (WOFF2, WOFF, TTF) from single source files
• Subsetting large collections: Create Latin-subset versions of 100+ fonts
• Format modernization: Convert legacy EOT/SVG fonts to modern formats
• Font family processing: Convert all weights/styles of multiple font families

Batch Conversion:

# Convert all TTF to WOFF2
for file in *.ttf; do
  woff2_compress "$file"
done

# Convert all WOFF2 back to TTF
for file in *.woff2; do
  woff2_decompress "$file"
done

Process:

1. File → Execute Script
2. Select batch conversion script
3. Choose input directory
4. Set output format and options
5. Run batch process

#!/usr/bin/env python3
import os
import sys
from pathlib import Path
from fontTools import ttLib
from multiprocessing import Pool

def convert_font(font_path):
    """Convert single font to WOFF2"""
    try:
        output = font_path.with_suffix('.woff2')
        font = ttLib.TTFont(font_path)
        font.flavor = 'woff2'
        font.save(output)
        return True, font_path.name
    except Exception as e:
        return False, f"{font_path.name}: {str(e)}"

def batch_convert(input_dir, output_dir, num_workers=4):
    """Batch convert all fonts with parallel processing"""
    input_path = Path(input_dir)
    output_path = Path(output_dir)
    output_path.mkdir(exist_ok=True)
    
    # Find all font files
    fonts = list(input_path.glob('*.ttf')) + list(input_path.glob('*.otf'))
    
    print(f"Found {len(fonts)} fonts to convert...")
    
    # Process in parallel
    with Pool(num_workers) as pool:
        results = pool.map(convert_font, fonts)
    
    # Report results
    success = sum(1 for ok, _ in results if ok)
    failed = len(results) - success
    
    print(f"\nConversion complete!")
    print(f"Success: {success} | Failed: {failed}")
    
    # Show failures
    if failed > 0:
        print("\nFailed fonts:")
        for ok, msg in results:
            if not ok:
                print(f"  - {msg}")

if __name__ == '__main__':
    if len(sys.argv) < 3:
        print("Usage: python batch-convert.py <input_dir> <output_dir>")
        sys.exit(1)
    
    batch_convert(sys.argv[1], sys.argv[2])

Consistent naming helps automation:

• • Source: Roboto-Regular.ttf, Roboto-Bold.ttf
• • WOFF2: roboto-regular.woff2, roboto-bold.woff2
• • Subset: roboto-regular-latin.woff2
• • Use lowercase, hyphens (not spaces or underscores)
• • Include weight/style in filename