What is PFM?

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

What is FON?

Windows FON is the system font resource format for Windows, serving as a container for bitmap or TrueType font data.

When Should You Use PFM vs FON?

PFM vs FON: Key Differences

• •PFM uses lossless compression while FON uses lossless compression — both take the same approach to file size management.
• •Since both PFM and FON use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Alpha channel support: FON lacks transparency support.
• •PFM files are typically Very small, binary format while FON files range Small system font resources
• •Use case fit: PFM targets windows postscript printing, font pairing and FON targets windows system fonts, ui font resources — your choice depends on which workflow stage you are serving.

Advantages of PFM

• ✓PFM applies lossless compression specifically calibrated for Windows PostScript printing, font pairing.
• ✓PFM enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓PFM guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find PFM support built into virtually every tool that handles Windows PostScript printing, font pairing — no plugins or converters needed.

Advantages of FON

• ✓FON applies lossless compression specifically calibrated for Windows system fonts, UI font resources.
• ✓FON enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓FON guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find FON support built into virtually every tool that handles Windows system fonts, UI font resources — no plugins or converters needed.

Common Use Cases for PFM to FON Conversion

• Brand identity
• Print design
• Mobile apps
• Desktop publishing
• E-book formatting
• User interfaces

Industry Applications

Best Practices for PFM to FON Conversion

• →Converting PFM to FON: check that glyph coverage is preserved — some formats have character limitations
• →Use FON for cross-platform compatibility
• →Test fonts across different browsers and operating systems after conversion
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting PFM to FON Conversion

• !The converted FON font has incorrect metrics → advance width and kerning values may differ between formats despite identical glyphs
• !FON file looks heavier or lighter than PFM → font rendering engines handle weight and anti-aliasing differently per format
• !OpenType features (ligatures, swashes) lost after conversion to FON → verify the target format supports advanced typographic features
• !Variable font axes missing from the converted FON → variable font support varies significantly between formats

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