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Supported Formats
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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 Legacy format superseded by Unicode OpenType.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 is an EOT file and why was it created specifically for Internet Explorer?
EOT (Embedded OpenType) is a compressed font format developed by Microsoft to enable web font embedding in early versions of Internet Explorer.
At the time, browsers did not support raw TTF or OTF files, so EOT acted as a controlled delivery format.
Its design relied heavily on IE’s proprietary font engine and embedding rules.
Why do EOT fonts require a special embedding mechanism called 'rootstring'?
The rootstring allowed the font to be locked to specific domain names to prevent unauthorized redistribution.
This provided basic DRM-like protection for commercial font vendors in the early web era.
Although primitive by modern standards, it was a key security feature of EOT.
Why does EOT depend on the OpenType structure internally?
EOT is essentially a wrapper around an OTF or TTF font with additional metadata and compression.
It preserves the original outline data but restructures it for compatibility with Internet Explorer’s APIs.
This hybrid nature allowed old browsers to use high-quality OpenType fonts without direct support.
Why did EOT become obsolete once modern browsers gained @font-face support?
Browsers gradually standardized on WOFF and WOFF2, which offered better compression and universal support.
EOT remained tied exclusively to legacy Internet Explorer versions.
As IE faded, the need for EOT disappeared entirely from modern workflows.
Why do developers sometimes still encounter EOT files in old projects?
Many legacy corporate websites created during the IE6–IE9 era used EOT as their primary web font format.
These websites were never updated or migrated to more modern technologies.
Maintenance of old intranet systems often exposes leftover EOT assets.
Why did older licensing rules encourage the use of EOT?
Font vendors were concerned about raw fonts being downloaded directly by end users.
EOT’s restricted embedding and domain-locking features offered a compromise.
This allowed legal web embedding during a time of stricter distribution policies.
Why do modern browsers refuse to load EOT files?
EOT was never standardized beyond Internet Explorer and lacks support in contemporary engines.
Modern security models reject its legacy embedding mechanisms as outdated.
As a result, only old IE versions can interpret EOT correctly.
Why was EOT criticized for its reliance on proprietary technology?
It locked web typography to Microsoft’s rendering pipeline, limiting cross-browser consistency.
Other browser vendors opposed adopting a format they could not control or extend.
This contributed to the push toward open, community-driven formats like WOFF.
Why does EOT often produce incomplete or corrupted rendering outside IE?
Non-IE browsers do not implement the embedded OpenType loader required to interpret EOT tables.
Many EOT files omit data that normal OpenType files expect to contain.
Without IE’s specific parsing logic, these fonts cannot render properly elsewhere.
Why did early web designers compress fonts into EOT instead of serving TTF directly?
Internet Explorer blocked raw TTF and OTF downloads for security reasons.
EOT was Microsoft’s approved method to safely embed typefaces on websites.
At the time, no other browser offered an accepted alternative.
Why did EOT include checksum validation mechanisms?
The checksum ensured that the embedded font had not been altered or corrupted.
It also worked as part of the domain-locking system to prevent tampering.
These safeguards were necessary due to IE’s strict security model for downloadable fonts.
Why was EOT frequently paired with conditional comments in HTML?
Conditional comments let developers serve EOT only to Internet Explorer while other browsers received alternate formats.
This avoided errors on browsers lacking EOT support.
It also allowed mixed-format strategies during the transitional era of web typography.
Why is converting EOT back to TTF or OTF often problematic?
EOT may strip or compress certain tables that modern editors expect.
Domain-locking metadata can interfere with extraction tools.
Recovery is possible, but the output may be incomplete or require manual repair.
Why do some archived government and enterprise sites still rely on EOT?
Large institutions often freeze their technology stacks for stability and long-term compatibility.
Updating fonts would require revising templates, testing multiple browsers, and verifying legal licenses.
As a result, many outdated systems continue using EOT decades after its prime.
Why is EOT no longer recommended for any modern web project?
It is unsupported by current browsers, making it unusable for modern traffic.
Files are larger and less efficient than WOFF or WOFF2.
Modern standards provide better performance, better compression, and universal compatibility.