An ".otf" font is in the OpenType format. It is a computer font designed by Microsoft and Adobe based on the TrueType format. It expands on the TrueType font by including an expanded character set and layout features. The OpenType format is a cross-compatible format, which means that the same font can be used on both Windows and Mac. However, the OpenType format is not recognized by all word processing and graphic applications. To use the font with the applications that do not recognize the OpenType format, you can convert them into the TrueType (.ttf) format.
Download and install the FontForge software for your operating system (see Resources).
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Open the "FontForge" application.
Locate the ".otf" font that you want to convert in the "Open Font" window.
Click the "File" menu at the top of the "Font" window.
Choose the "Generate Fonts" option.
Click on the "PS Type 1" button halfway down the screen.
Choose "TrueType" from the list of options.
Click the "Save" button to convert the font.
Online Font Converter
Open the online font converter in any web browser (see Resources).
Click the "Browse" button.
Choose the ".otf" file that you want to convert.
Click ".ttf" option from the drop down list under the "Browse" button.
Click the "Convert" button.
Choose "Save File" when the window containing the ".zip" file appears. This file will contain the ".ttf" font.