.OTF File Extension

OpenType Font

Developer Microsoft and Adobe Systems
3.8  |  119 Votes

What is an OTF file?

An OTF file is a font saved in the OpenType format developed by Microsoft and Adobe. The OpenType format combines aspects of the PostScript (.PS) and TrueType (.TTF) font formats. OTF fonts are fully scalable, meaning their characters can be resized without losing quality.

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Screenshot of a .otf file in Microsoft Windows Font Viewer
OTF file open in Microsoft Windows Font Viewer

In the 1990s, Microsoft set out to produce a competitor to Apple's TrueType font format. In collaboration with Adobe, Microsoft produced the OpenType font, or OTF, format. The OpenType format is similar to the TrueType format, except that it includes additional data structures that determine how fonts appear and behave.

In the early 2000s, the OpenType format became an open font standard. Thus, most computer systems can now recognize and install OTF fonts.

How do I use an OTF file as a font?

To use an OTF file as a font, you must first install it on your system. In Windows, you install fonts by placing them in the C:/​Windows/​Fonts directory. In macOS, you install fonts by opening them in Apple Font Book and selecting the Install Font button.

How to open an OTF file

You can open an OTF file in Microsoft Windows Font Viewer (Windows) or Apple Font Book (Mac). Before opening an OTF file in Windows Font Viewer, you must place the file in the C:/​Windows/​Fonts directory. Otherwise, Windows will not recognize the file as a valid font file.

Can I install OTF fonts on my Android device?

While it is more difficult to install an OTF font on an Android device than a Windows or Mac PC, you can do so. iFont is one application that allows users to install and use OTF fonts on Android devices.

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Programs that open or reference OTF files

Included with OS

OpenDocument Formula Template

Developer OASIS
2.8  |  29 Votes

Template for creating formulas used by OpenOffice spreadsheets; allows cells within the spreadsheet to be automatically filled in based on formula calculations; formatted using the OASIS OpenDocument XML standard.

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NOTE: The Organization for the Advancement of Structured Information Standards (OASIS) maintains the OpenDocument standard.

Programs that open OTF files


OpenTuft Tufting Design File

Developer NedGraphics
2.4  |  21 Votes

General interface format for creating tuft designs that can be processed by tufting machines; allows designs to be weaved into various textile products; contains information such as thread-up, yarn placement, and yarn tuft lengths.

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The OTF file format is specified in a Windows .INI file-like structure.

NOTE: The OTF format is supported by NedGraphics tuft design software, but NedGraphics changed the ".otf" extension to ".otu" since there were conflicts with OpenType font files.

Programs that open OTF files

NedGraphics Tuft software

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