OTF (OpenType Font)
OpenType is the modern font format that supports advanced typographic features like ligatures, small caps, stylistic alternates, and contextual substitution. OTF fonts use cubic Bezier curves (CFF outlines) for smoother glyph shapes and are the industry standard for professional typography.
MIME Type
font/otf
Type
Binary
Compression
Lossless
Advantages
- + Advanced typographic features (ligatures, alternates, small caps)
- + Cubic Bezier curves for smoother glyph outlines
- + Cross-platform — works on Windows, macOS, and Linux
- + Supports complex scripts (Arabic, Devanagari, CJK)
Disadvantages
- − Larger file sizes than WOFF2 for web use
- − Advanced features require application support to render
- − OTF with CFF outlines may render differently than TrueType
When to Use .OTF
Use OTF for professional typography that needs ligatures, alternates, and multi-script support; convert to WOFF2 for web delivery.
Technical Details
OTF files can contain either TrueType (quadratic) or CFF/CFF2 (cubic Bezier) outlines. OpenType Layout tables (GSUB, GPOS) enable programmable glyph substitution and positioning for complex scripts and advanced typography.
History
Microsoft and Adobe jointly developed OpenType in 1996, merging TrueType and PostScript Type 1 into a single format. OpenType has been an ISO standard (ISO/IEC 14496-22) since 2007.