OTF to TTF Converter

Most .otf files store their letters as PostScript (CFF) outlines, and a few programs still only accept TrueType outlines. This page rebuilds each glyph with TrueType curves and saves an installable .ttf with the same name, spacing and features.

or drop TTF, OTF, WOFF … files here ·

Max 95 MB per file· Up to 20 files· Deleted after 30 minutes

Output

Convert to

Files are processed on our servers and deleted after 30 minutes.

How to use this tool

1
Add your OTF fonts
Drop one or more .otf files, up to 20 per batch and 95 MB each. A whole family, Regular through Black, converts in one go.
2
Check the target and hinting
Convert to is already set to TTF. Open Advanced settings if you want Hinting on Auto-hint, or a new Family name so the TTF can sit next to the OTF.
3
Convert to TTF
Press Convert to TTF, then download the fonts one by one or as a ZIP. Double-click a .ttf to open the installer on Windows or Font Book on a Mac.

OTF vs TTF: two outline formats behind one font standard

TrueType came first. Apple shipped it with System 7 in 1991 to compete with Adobe's PostScript Type 1 fonts, and Microsoft adopted it for Windows 3.1. Its outlines are built from quadratic curves: each curved segment has one off-curve control point, which made rasterizing fast on the hardware of the time. It also brought its own hinting language: bytecode instructions that snap stems to the pixel grid.

OpenType, announced by Microsoft and Adobe in 1996, wrapped both worlds into one container. An OpenType font can hold TrueType outlines in a glyf table or PostScript outlines in a CFF table, which use cubic curves with two control points per segment. By convention the first kind is saved as .ttf and the second as .otf. Both carry the same OpenType layout features, which is why ligatures and small caps survive this conversion untouched.

The numbers that differ inside an OTF and a TTF

units per em in most CFF fonts: 1,000
units per em in many TrueType fonts: 2,048
control points per curve, cubic vs quadratic: 2 vs 1
units-per-em range the spec allows: 16–16,384

A cubic curve cannot always be drawn exactly with a single quadratic one, so the converter splits it into several quadratic segments that stay within a small error of the original path. On a typical text font this adds points to round letters such as O, S and g, which can make the TTF slightly larger than the OTF. The em size is kept, so a font designed on a 1,000-unit grid stays on that grid; TrueType accepts it even though 2,048 is the traditional choice.

Hinting is where the two formats really part ways. CFF fonts carry declarative hints (stem widths and alignment zones) and leave the rest to the rasterizer, while TrueType expects explicit instructions. Nothing maps one to the other. If the TTF will mostly be seen on Windows at small sizes, set Hinting to Auto-hint so new instructions are generated; on macOS, phones and high-density screens, hints matter little. Need a font for a website rather than a desktop app? Skip the TTF step and go straight to TTF to WOFF2 after converting, or see the font converter for every target.

Converting a licensed OTF to TTF

A new file extension does not mean a new license

The TTF is still the same typeface under the same end-user license. Converting a commercial OTF to install it on more computers, embed it in an app or bundle it with a product needs the rights for that use. Fonts under the SIL Open Font License may be converted freely, but a modified copy must not keep a Reserved Font Name.

OTF

OpenType font

OTF is the OpenType font format, created by Microsoft and Adobe in 1996 and now the ISO standard ISO/IEC 14496-22. It can contain TrueType or PostScript (CFF) outlines and supports advanced typography such as ligatures, alternates, small caps and wide language coverage. OpenType is the standard for professional fonts on all major platforms. It is not compressed for the web, so websites usually serve WOFF2 instead.

Compression: Lossless
Transparency: –
Animation: –
Introduced: 1996 · Microsoft and Adobe

OTF converter

TTF

TrueType font

TTF is the TrueType font format developed by Apple in the late 1980s and released in 1991, then licensed to Microsoft. It defines glyph outlines with quadratic curves and includes hinting instructions that make text look sharp on screens. TrueType is supported by every desktop operating system, word processor and design app. It lacks some advanced typographic features of OpenType and is larger than web font formats.

Compression: Lossless
Transparency: –
Animation: –
Introduced: 1991 · Apple

TTF converter

OTF to TTF trades PostScript cubic outlines for TrueType quadratic ones so the font loads in software that only reads the older TrueType rasterizer, at the cost of the original PostScript hints.

OTF to TTF questions

Will my OTF font look different after converting to TTF?

Not at reading sizes. Each cubic curve is approximated by one or more quadratic curves within a very small tolerance, so the difference sits well under a pixel. At poster sizes a type designer comparing outlines point by point may spot extra on-curve points, but the shapes match.

Why does a program accept TTF but not my OTF file?

Some older Windows software, cutting-machine and embroidery tools, game engines and microcontroller display libraries were built around the TrueType rasterizer and never added a CFF reader. They see an .otf with PostScript outlines as unreadable even though Windows itself installs it.

Does converting OTF to TTF keep ligatures and kerning?

Yes. OpenType layout tables such as GSUB (ligatures, alternates) and GPOS (kerning, mark positioning) do not depend on the outline type, so they are copied into the TTF unchanged. Only the outline table and the hints are rebuilt.

Can Word embed an OTF font in a document?

Word on Windows has long embedded TrueType-flavored fonts with Embed fonts in the file but often skips CFF-based OTF files, so the document falls back to another font on a computer without it. Converting to TTF is a common workaround, provided the font's license allows embedding.

Should I install both the OTF and the TTF of the same font?

No. Two files with the same internal family and style name confuse font menus and can make apps pick the wrong one. Uninstall the OTF first, or give the TTF a different Family name before converting.