Converting TTF to OTF switches the file's extension and container header but keeps the underlying glyph data intact. This is primarily a re-labeling. Both formats share the same SFNT structure, and most tools treat them interchangeably. Useful when a design pipeline or document explicitly expects .otf extensions.
Drag & drop font files here, or browse
Drop your TTF files here
No glyph information is lost or added. The conversion can't inject cubic Bézier (CFF) outlines that the TTF didn't have. If the source uses quadratic Béziers, the OTF will too. Advanced OpenType features depend on what tables the source already contains.
OTF runs on every desktop OS, every DTP application, and every modern browser. Since 2005 there has been effectively no OS that can read TTF but not OTF.
TTF (TrueType) was developed by Apple in the late 1980s and became the default desktop font format across every major OS. It describes glyphs with quadratic Bézier curves and ships uncompressed, which makes files straightforward to parse but larger than compressed alternatives. Every text-rendering system on the planet accepts TTF.
OTF (OpenType) is Microsoft and Adobe's extension of the TrueType format. It adds cubic Bézier (PostScript/CFF) glyph support plus rich typographic features: stylistic alternates, ligatures, small caps, contextual substitutions, and the full OpenType feature model. Professional typography depends on OTF's capabilities.
Only when the font actually uses OTF-specific features (CFF outlines, advanced typography tables). The file format itself doesn't improve a font; the glyph data inside does. Many fonts shipped as .otf contain TrueType outlines identical to their .ttf siblings.
No. Rendering quality depends on the glyph outlines, hinting, and OpenType tables present in the source. Converting the container doesn't change any of those.
TTF (TrueType) was developed by Apple in the late 1980s and became the default desktop font format across every major OS. It describes glyphs with quadratic Bézier curves and ships uncompressed, which makes files straightforward to parse but larger than compressed alternatives. Every text-rendering system on the planet accepts TTF.
OTF (OpenType) is Microsoft and Adobe's extension of the TrueType format. It adds cubic Bézier (PostScript/CFF) glyph support plus rich typographic features: stylistic alternates, ligatures, small caps, contextual substitutions, and the full OpenType feature model. Professional typography depends on OTF's capabilities.
Yes. The converter runs entirely in your browser using WebAssembly. Your font files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit. Font files are usually small (under a few MB), so even very large fonts process without issue. Variable fonts with many axes are handled cleanly.