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What is it
The modern font standard, jointly developed by Microsoft and Adobe to unify TrueType and PostScript fonts under one roof. OpenType fonts support advanced typographic features that designers actually care about: ligatures, stylistic alternates, small caps, swashes, contextual substitutions, and variable weights in a single file. OTF is the preferred format for professional typography and graphic design. It uses cubic Bezier curves for smoother outlines than TrueType. Every major operating system and design application supports it natively.
Technical details
Safety
What opens it
OS font viewer (double-click)
FontForge
Glyphs
FAQ
Do I need OTF or TTF?
For design work and professional typography, OTF is preferred — it supports more advanced features. For everyday use (documents, presentations), either works. Most modern fonts are distributed as OTF.
Can I convert OTF to TTF?
Yes, using tools like FontForge (free) or transfonter.org. Be aware that advanced OpenType features (ligatures, alternates) may not transfer perfectly to TrueType.
Related formats