What is PFM?

Printer Font Metrics (PFM) is the binary companion to PFB fonts for Windows, containing font metric data for printing.

What is UFO?

UFO (Unified Font Object) is an open, XML-based font source format used by professional font editors for collaborative font development.

When Should You Use PFM vs UFO?

PFM vs UFO: Key Differences

• •PFM and UFO diverge on compression: lossless compression for the source, lossless compression for the target.
• •Since both PFM and UFO use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Alpha channel support: UFO lacks transparency support.
• •PFM files are typically Very small, binary format while UFO files range 100KB to 10MB+ depending on glyph count
• •Primary audience: PFM is built for windows postscript printing, font pairing scenarios, while UFO focuses on font design and editing, collaborative font development, glyphs/robofont — pick the format that matches your output requirement.

Advantages of PFM

• ✓At its core, PFM relies on lossless encoding — a design choice that makes it perfect for Windows PostScript printing, font pairing.
• ✓You won't run into compatibility issues with PFM — it's a universal standard across platforms.
• ✓File size management with PFM: larger files guaranteed to match the original exactly.
• ✓Every major application in the Windows PostScript printing, font pairing space supports PFM natively.

Advantages of UFO

• ✓At its core, UFO relies on lossless encoding — a design choice that makes it perfect for Font design and editing, collaborative font development, Glyphs/RoboFont.
• ✓You won't run into compatibility issues with UFO — it's a universal standard across platforms.
• ✓File size management with UFO: larger files guaranteed to match the original exactly.
• ✓Every major application in the Font design and editing, collaborative font development, Glyphs/RoboFont space supports UFO natively.

Common Use Cases for PFM to UFO Conversion

• Packaging design
• Signage systems
• Icon sets
• Logo design
• Data visualization
• Presentation design

Industry Applications

Best Practices for PFM to UFO Conversion

• →Before converting PFM to UFO, review the font license — some licenses restrict format conversion
• →Check hinting data after conversion: UFO may handle TrueType hinting differently than PFM
• →Verify that all character sets (Latin, Cyrillic, CJK, etc.) survived the conversion intact
• →Test the converted font in both a browser and a desktop application
• →Keep the original font file in case the conversion alters spacing metrics

Troubleshooting PFM to UFO Conversion

• !UFO font doesn't render correctly → check if UFO supports all glyphs present in PFM
• !Licensing restrictions after PFM to UFO conversion → verify the font license allows format conversion
• !Hinting data lost converting PFM to UFO → some font formats like UFO may not preserve TrueType hinting
• !Special characters missing from converted UFO → font subsetting may have removed unused glyphs

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