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Supported Formats
Convert between all major file formats with high quality
Desktop Fonts
TrueType Font - universal desktop font format developed by Apple and Microsoft in the 1980s. Uses quadratic Bézier curves for glyph outlines. Excellent screen rendering with hinting technology. Works on all platforms (Windows, Mac, Linux). Supports Unicode with up to 65,536 glyphs. Standard desktop font format with maximum compatibility. Perfect for document embedding, desktop publishing, and cross-platform typography. Universal support in all operating systems and applications. Reliable choice for general-purpose font usage.
OpenType Font - modern font format jointly developed by Adobe and Microsoft (1996) extending TrueType. Uses cubic Bézier curves (PostScript outlines) allowing more complex glyph shapes. Supports advanced typography features (ligatures, alternate glyphs, contextual substitutions). Can contain up to 65,536 glyphs enabling comprehensive language support. Cross-platform compatibility (Windows, Mac, Linux). Industry standard for professional typography and multilingual documents. Perfect for print design, branding, and high-quality typography. Superior to TTF for complex scripts and advanced typographic features.
Mac Data Fork Font - legacy Macintosh font format storing TrueType/PostScript data in data fork. Used in Mac OS 9 and earlier. Phased out with Mac OS X transition to .ttf and .otf. Contains complete font data in single file (unlike resource fork fonts). Limited compatibility with modern systems. Convert to TTF or OTF for current macOS and cross-platform use. Historical format important for accessing old Mac fonts. Mainly encountered when migrating legacy Mac systems.
Compact Font Format - Adobe's space-efficient font outline format used within OpenType fonts. Stores glyph outlines using PostScript-based charstrings. More compact than TrueType outlines. Used in OTF fonts with PostScript outlines. Not standalone font file - embedded in OTF. Professional typography standard. Better compression than TTF outlines. Extract from OTF or work with complete OTF fonts.
CID-Keyed Font - Adobe font format for large character sets (Asian languages with thousands of characters). Character ID based system for efficient large font handling. Used in professional CJK (Chinese, Japanese, Korean) typography. Complex format requiring PostScript RIP support. Legacy format superseded by Unicode OpenType. Convert to modern OTF with Unicode mapping for compatibility. Important for accessing legacy Asian language fonts.
Spline Font Database - FontForge's native font format. Editable font source format storing complete font data including editing information. ASCII or binary format with full font metadata. Used in font design and development. Convert to TTF/OTF for deployable fonts. Perfect for font design workflow. Maintains complete font development history. FontForge is free open-source font editor.
Unified Font Object - open source font source format (XML-based directory structure). Developed by font tool creators for interoperability. Stores complete font design data in human-readable XML. Used by modern font editors (RoboFont, Glyphs, FontForge). Perfect for font development and version control. Industry standard for open font source files. Compile to TTF/OTF for distribution. Excellent for collaborative font design.
Web Formats
Web Open Font Format - font format specifically designed for web use (2009). Compressed TrueType/OpenType fonts reducing file size by ~40%. Supported by 99% of browsers (Chrome, Firefox, Safari, Edge). Includes metadata for licensing and font information. Perfect for website typography ensuring consistent rendering across devices. Industry standard for web fonts. Faster page loads than raw TTF/OTF. Essential for modern web design and custom typography. Recommended for broad web compatibility.
WOFF 2.0 - improved web font format (2014) with better compression using Brotli algorithm. 30% smaller than WOFF with faster decompression. Supported by all modern browsers (96%+ global coverage). Maintains WOFF's metadata and licensing features. Superior performance for web typography. Recommended format for modern websites. Falls back to WOFF for older browsers. Essential for optimizing website performance and reducing bandwidth. Default choice for contemporary web development.
Embedded OpenType - proprietary web font format developed by Microsoft for Internet Explorer. Compressed and subset fonts with DRM protection. Only supported by Internet Explorer (legacy browser). Obsolete format replaced by WOFF/WOFF2. Historically important for web fonts (1997-2010s). Still encountered in legacy websites. Not recommended for new projects. Convert to WOFF2/WOFF for modern browsers. Maintained only for backward compatibility with old IE versions.
SVG Font - vector-based font format embedded in SVG files. Defines glyphs as SVG paths allowing colors, gradients, and effects. Deprecated for web use in favor of WOFF. Limited browser support (only Safari supports SVG fonts). Larger file sizes than outline fonts. Mainly historical format. Useful for special effects and colored fonts. Modern alternative: OpenType-SVG. Not recommended for general use. Better options: WOFF2 with icon fonts or OpenType color fonts.
Specialized Formats
PostScript Font Binary - Adobe Type 1 binary format for professional printing (1984). Contains glyph outlines in PostScript language. Excellent print quality with precise curves. Requires corresponding PFM or AFM metrics file. Standard in professional publishing and printing industry. Limited to 256 glyphs (single-byte encoding). Being replaced by OpenType. Still used in legacy publishing workflows. Convert to OTF for modern compatibility while preserving PostScript quality.
PostScript Font ASCII - Adobe Type 1 ASCII variant of PFB format. Human-readable PostScript code defining font outlines. Used for font development and debugging. Less efficient than PFB binary format. Requires PFM or AFM metrics file. Same quality as PFB for printing. Legacy format for professional typography. Convert to OTF for modern systems. Primarily historical significance in desktop publishing evolution.
Printer Font Metrics - Windows metrics file for Type 1 PostScript fonts. Contains font measurements (character widths, kerning pairs, bounding boxes). Required companion to PFB/PFA for proper rendering on Windows. Text file format with font metrics data. Does not contain glyph outlines. Legacy format from Windows 3.1/95 era. Used with PFB for complete Type 1 font installation. Modern OpenType fonts include metrics internally. Convert Type 1 fonts to OTF to consolidate metrics and outlines.
Adobe Font Metrics - Adobe's metrics format for Type 1 PostScript fonts. Contains character widths, kerning pairs, ligatures, and bounding boxes. ASCII text format readable by humans and applications. Companion to PFB/PFA outline files. Used by font design tools and professional publishing software. Essential for proper font spacing and kerning. Legacy format with historical importance in digital typography. Modern fonts embed metrics in OTF format. Convert to OpenType for integrated metrics and outlines.
Binary Font File - generic binary font data format used by various font tools and editors. Contains raw font outline data without specific format wrapper. Used in font development and conversion pipelines. Requires specific tools to process. Not a standard end-user format. Intermediate format in font creation workflow. Convert to TTF or OTF for usable fonts. Primarily relevant in font design and development contexts.
Mac Suitcase Font - legacy Macintosh font container (Mac OS Classic) storing multiple fonts in one file. Contains TrueType or PostScript fonts in resource fork. Used with Font Suitcase format (.suit extension). Obsolete with Mac OS X migration. Poor compatibility with modern systems. Required Font/DA Mover for installation on old Macs. Extract individual fonts and convert to TTF/OTF for modern use. Important for recovering fonts from classic Mac archives and systems.
PostScript Font Program - Adobe PostScript Type 1 font in PostScript language format. Contains font outlines as PostScript code. Used for printer font downloads and font development. Human-readable but inefficient. Legacy format from desktop publishing era. Convert to OTF for modern usage. Historical importance in professional typography. Mainly encountered in old publishing workflows.
PageMaker 3 Font - legacy font format from Aldus PageMaker 3.0 (1980s desktop publishing). Proprietary format specific to early PageMaker versions. Obsolete format with no modern support. Important only for recovering old PageMaker documents. Convert to TTF/OTF if font data recoverable. Historical artifact from desktop publishing evolution. Better alternatives available for all uses.
Type 11 Font - variant of PostScript CID-Keyed font format. Used for complex fonts with large character sets. Legacy format for Asian language fonts. Limited modern support. Convert to Unicode OpenType for compatibility. Historical format in CJK font development. Modern alternatives handle large character sets better with Unicode.
Type 42 Font - PostScript font format wrapping TrueType outlines. Hybrid format combining PostScript wrapper with TrueType data. Used for downloading TrueType fonts to PostScript printers. Primarily printer-internal format. Limited end-user relevance. Convert underlying TrueType to TTF/OTF. Historical bridge between TrueType and PostScript worlds.
How to Convert Files
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Frequently Asked Questions
What makes an OTF file different from older font formats?
An OTF file (OpenType Font) uses a modular architecture combining TrueType or CFF outlines with advanced typographic tables.
Its design allows far more features, such as contextual alternates, ligatures, stylistic sets, and multilingual shaping logic.
This flexibility made OTF the preferred format for modern digital typography and professional publishing.
Why do OTF fonts handle advanced typography better than TTF?
OTF includes OpenType Layout (OTL) tables that can process complex script behavior and contextual glyph substitutions.
These tables enable features like small caps, alternate numerals, and language-specific reshaping.
Such capabilities give OTF a significant advantage in professional design environments.
Why do many designers choose OTF for multilingual projects?
OpenType supports large character sets and can encode multiple writing systems in a single file.
Complex scripts like Arabic, Devanagari, and Thai rely on OTL instructions that OTF handles with precision.
This makes it ideal for global type families and editorial workflows.
Why do OTF fonts sometimes include both TrueType and CFF outlines?
OpenType is a container format that supports either quadratic (TrueType) or cubic (PostScript) curves.
Foundries can choose the outline technology that suits the font’s aesthetics or performance goals.
This dual compatibility is one reason OTF became the unified industry standard.
Why are CFF-based OTF fonts preferred for high-end printing?
CFF outlines use compact cubic Bézier curves, which generate smoother strokes in PostScript-based workflows.
They also produce smaller files, making them efficient for large font families.
Professional printers often rely on this precision for consistent output.
Why do OTF fonts support discretionary and contextual ligatures?
OpenType includes substitution tables that allow fonts to switch glyphs based on surrounding characters.
This enables elegant ligature systems that adapt to stylistic preferences.
Many high-end fonts use these capabilities to provide sophisticated text aesthetics.
Why are stylistic sets a major advantage of OTF fonts?
Each stylistic set groups alternative letterforms that can be activated selectively.
Designers use these sets to customize tone—formal, playful, classic, modern—without switching fonts.
OTF uniquely supports multiple sets in one file, offering creative flexibility.
Why do some OTF fonts behave differently in older software?
Early applications lacked full support for OpenType layout features.
This can cause missing ligatures, incorrect shaping, or inactive stylistic options.
Modern software fully interprets OTL tables, resolving these inconsistencies.
Why can OTF fonts include hundreds or even thousands of glyph variations?
OpenType allows extremely large glyph inventories, far beyond legacy limits.
Designers often include alternate characters, numeral styles, fractions, and ornaments.
This density gives OTF fonts versatility that static formats cannot match.
Why do OTF fonts sometimes provide better kerning than simpler formats?
OTF supports class-based kerning, which groups glyphs for more efficient spacing rules.
This allows thousands of kerning pairs without bloating file size.
The result is more consistent alignment across diverse character combinations.
Why do OTF fonts integrate well with professional design suites?
Software like Adobe Illustrator, InDesign, and Affinity tools fully parse OpenType features.
Designers can activate alternates, ligatures, fraction builders, and language-specific shaping directly in the UI.
This deeper integration encourages widespread adoption of OTF for print and branding work.
Why are OTF fonts often more efficient than TTF for complex families?
CFF-based OTF stores outlines in a compressed structure that reduces file weight.
Large families with many weights and styles benefit from this compactness.
This makes OTF ideal for type foundries producing extensive collections.
Why do some OTF fonts include embedded programming logic?
OpenType supports glyph substitution rules programmed using feature tags like 'liga', 'calt', 'tnum', and 'ss01'.
These rules behave like micro-scripts that control text shaping automatically.
This embedded intelligence is unique to advanced OpenType design.
Why do OTF fonts handle vertical writing systems effectively?
OpenType includes vertical metrics, alternate glyphs, and orientation rules for East Asian scripts.
These features allow correct rotation, spacing, and alignment without manually adjusting characters.
This capability is essential for Japanese, Chinese, and Korean publishing.
Why is OTF considered future-proof compared to older formats?
Its extensible architecture allows the addition of new typographic features without redesigning the format.
Continuous support from major OS developers ensures long-term compatibility.
Its adaptability makes OpenType the dominant standard for modern and next-generation typography.