TTF to OTF Converter - Free Online Tool

A TTF stores glyphs as TrueType outlines, built from quadratic Bézier curves. OTF is an OpenType container too, but it is the format built around PostScript (CFF) outlines, which use cubic curves.

There are two honest ways to make an OTF from a TTF, and the right one depends on what the destination expects.

The straightforward path rewraps the existing quadratic outlines inside an .otf file. That is lossless, since nothing is redrawn, and it satisfies any tool that simply requires the .otf extension.

The fuller path converts the quadratic curves to cubic CFF outlines so the result is a “true” PostScript-flavored OTF, which is what some foundries and print pipelines expect; because cubic-to-quadratic is an approximation in either direction, that step rebuilds the outline data rather than copying it byte-for-byte, though the rendered letterforms stay faithful at normal sizes.

In both cases kerning pairs, OpenType features, ligatures, and the complete character set carry across.

For everyday desktop use on Windows, macOS, and Linux, TTF and OTF are equally at home, and converting between them brings no functional gain on its own.

The reason to do it is almost always external: something downstream is asking for an .otf file specifically.

The common cases are consistent. Some type foundries and marketplaces require submissions in OTF. Certain print and publishing workflows are standardized on PostScript outlines and expect OTF as the deliverable.

A design system or brand guideline may specify OTF for consistency across a team. And occasionally a particular application simply lists OTF as its accepted format.

In each case the typeface itself is unchanged; it just has to arrive as an OTF for the destination to accept it. If you have no such requirement, a TTF will serve you just as well.