What is BDF?

Glyph Bitmap Distribution Format (BDF) is a human-readable bitmap font format for X11, describing glyphs in ASCII text.

What is TTC?

TrueType Collection (TTC) bundles multiple TrueType fonts into a single file, commonly used for CJK (Chinese, Japanese, Korean) font families.

When Should You Use BDF vs TTC?

BDF vs TTC: Key Differences

• •The core technical difference: BDF relies on lossless compression whereas TTC 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.
• •Transparency: N/A
• •Storage footprint: Moderate, plain text font data for BDF vs 5-30MB for CJK font collections for TTC.
• •Use case fit: BDF targets x11 terminal fonts, embedded system displays and TTC targets font distribution, cjk font collections — your choice depends on which workflow stage you are serving.

Advantages of BDF

• ✓The lossless nature of BDF means file sizes stay reasonable while handling X11 terminal fonts, embedded system displays efficiently.
• ✓From mobile devices to enterprise servers, BDF is recognized and supported everywhere.
• ✓The trade-off for BDF's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓BDF is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of TTC

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

Common Use Cases for BDF to TTC Conversion

• User interfaces
• Marketing materials
• Packaging design
• Signage systems
• Icon sets
• Logo design

Industry Applications

Best Practices for BDF to TTC Conversion

• →Before converting BDF to TTC, review the font license — some licenses restrict format conversion
• →Check hinting data after conversion: TTC may handle TrueType hinting differently than BDF
• →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 BDF to TTC Conversion

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

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