What is SFD?

Spline Font Database (SFD) is the native project file format for FontForge, an open-source font editor for font design.

What is PFA?

PostScript Type 1 ASCII (PFA) is a human-readable printer font format used in professional typesetting and PostScript printing.

When Should You Use SFD vs PFA?

SFD vs PFA: Key Differences

• •The core technical difference: SFD relies on lossless compression whereas PFA uses lossless compression.
• •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
• •How transparency is handled: PFA supports transparency, so alpha information is preserved during conversion.
• •File sizes: SFD files typically range Larger than production fonts due to editing metadata and PFA files 20-100KB per font.
• •Use case fit: SFD targets font design and editing, fontforge projects and PFA targets professional printing, postscript devices — your choice depends on which workflow stage you are serving.

Advantages of SFD

• ✓The lossless nature of SFD means file sizes stay reasonable while handling Font design and editing, FontForge projects efficiently.
• ✓From mobile devices to enterprise servers, SFD is recognized and supported everywhere.
• ✓The trade-off for SFD's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓SFD is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of PFA

• ✓The lossless nature of PFA means file sizes stay reasonable while handling Professional printing, PostScript devices efficiently.
• ✓From mobile devices to enterprise servers, PFA is recognized and supported everywhere.
• ✓The trade-off for PFA's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓PFA is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for SFD to PFA Conversion

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

Industry Applications

Best Practices for SFD to PFA Conversion

• →Converting SFD to PFA: check that glyph coverage is preserved — some formats have character limitations
• →Use PFA 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 SFD to PFA Conversion

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

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