Opening OTF Files

The OTF file type is primarily associated with OpenOffice/StarOffice.

OTF	File extension: OTF
	File type:	OpenDocument formula template file

What is an OTF file

OTF files mostly belong to OpenOffice/StarOffice by Sun Microsystems. OTF(Open Type Font) is a digital typography font file that was developed by Microsoft and Adobe, and it extends features of TTF fonts. It uses the SFNT format which brings together features from PostScript and TrueType fonts, enabling it to support numerous writing systems. For these reasons, it's used on all major platforms including Windows, Mac, Linux, Symbian and Android.

The OTF file format uses structure starts (at byte 0 if the file has only one font) with a table directory as the top-level container for other tables in the file. Otherwise, it's at the TTCHeader's location. Each table record has Tag(identifier), uint32(checksum), Offset32(offset), uint32(the table's length) as fields. In OTF font files, each table must be represented by names referred to as tags.

This format uses Big Endian data types such as int8, int16, int32 fixed, FWORD, UFWORD, LONGDATETIME, Offset16, Offset32, Tag, F2DOT14, Version16Dot16, int16, uint8, uint16, uint24, uint32. It supports extra characters such as ligatures, small caps or alternative characters, making it excellent for design. OTF font files can contain over 65, 500 glyphs.

To create new font files, you need special software designed for typography design which include PaintFont, FontStruct, Fontself, Metaflop, and Font Forge.

To open OTF font files on Windows or Unix systems, several methods can be used but the quickest is to simply double-click the files and let the operating system open it for you. Aalternatively, right-click on the file and Open or Install. When opened, the font will present a button to install it.

Other formats associated with OTF include TFF, CFF, OTD, WOFF, DFONT, CID, OCF, EOT, FNT, AMFM, ACFM, GTF, MMM, PFA, TPF, and TTC.

How to open OTF files

You need a suitable software like OpenOffice/StarOffice to open an OTF file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your OTF file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OTF file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OTF File Viewer

Choose your .otf file to view

or drag and drop it here

Online File Viewer

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How to convert OTF files to JPG, PDF, HTML, DOC, ...

If you want to convert or edit an OTF file, you can use our free Online OTF File Converter (powered by Convert.Guru):

To do this, click the button "Choose your .otf file to view" on this page.
Your OTF file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then click the file format (e.g. PDF, JPG, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert OTF files:

OpenOffice/StarOffice by Sun Microsystems
See the previous paragraphs to learn more about the main application. OTF files are often referred to as OpenOffice/StarOffice data files because this type of file is primarily created or used by this software.
Blu-ray
Blu-ray video files store subtitle font information within OTF files in the form of aaaaa.otf, where the 5-letter string represents a 5-digit number corresponding to the font. Otherwise, there exists no other documentation regarding this usage. This file format is classified as Video. Related links: Blu-ray Wiki
FontForge
FontForge is a free application that is utilized to create, edit, and convert a variety of font formats, designed to run on Windows, Mac OS, and Linux machines. The OTF file that it utilizes is a font file saved within the OpenType format, developed and maintained by Adobe and Microsoft. It combines aspects of the PostScript and TrueType font formats, where these files are supported on various different programs, not only FontForge. This file format is classified as Font. Related links: Documentation page, General OpenType format
OnkoS
OnkoS is a German vocabulary training site. However, there exists no documentation regarding this program. This file format is classified as Data.

OTF file format details:

To find out what program is needed to open OTF files, you need to determine the file format. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. If there are problems opening a file, you must first determine the file format used. In the following you will find our evaluation of the OTF files:

OTF is a very commonly used file extension and is mainly used by one program with a specific format. The two most popular formats are as follows:

80% of all OTF files are OpenType Font files. These files are binary files, so they do not contain text, but only cryptic characters. A typical file size is 70 KB. The file type was created 10 years ago, but is still used today. The following keywords are characteristic: OTTO, 6hhea, $hmtx, maxp, head, `cmap, name, CFF, GSUB, post and GPOS. Such files sometimes refer to regular, bold, light, font, black, sans, medium and noto.
10% of all OTF files use the same file format, which can be identified by the letters "00 01 00 00" at the beginning. These are binary files, so they do not contain words or text. OTF files are between 11 KB and 170 KB in size. The keywords 6hhea, gasp, DSIG, glyf, head, `cmap, GDEF, $hmtx, loca, cvt, maxp, GPOS and name are typical for these files. Files like these are about demo, myfont, italic and artis.

All other OTF files (10%) have different formats, such as Mac2OSX. Sometimes used for awesome, script, display, icons, gotham, source, book or text. You can get all the details of your OTF file by dragging it onto this page or by clicking the button "Choose your .otf file to view" above.

Technical Data for OTF File Extension

File classification:

Data

Related files:

ttf, oft, zip, jpg, woff, woff2, txt, eot, tff, png, rar, suit, pdf, odt, fnt, sfd, ttc, font, hx, ots, otc, otg

Mime type:

font/otf, application/vnd.oasis.opendocument.base

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: otffile, FileType: OpenType Font file, AppName: Windows Font Viewer
EXEFile: fontview.exe

ProgramID: otffile
EXEFile: %SystemRoot%\System32\fontview.exe %1

ProgramID: OTF_Document
EXEFile: %ProgramFiles%\IXOS\IXOS-eCONtext\bin\alviewer.exe

ProgramID: otffile
EXEFile: %SystemRoot%\SysWow64\fontview.exe

Show all 4 listings To Top

an otf OpenDocument formula template file is a special file format by Sun Microsystems and should only be edited and saved with the appropriate software.

How to solve problems with OTF files

Associate the OTF file extension with the correct application.
Update your software that should actually open opendocument formula template files. Because only the current version supports the latest OTF file format. Search, therefore, e.g. on the Sun Microsystems manufacturer website after an available OpenOffice/StarOffice update.
To make sure that your OTF file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .OTF file online - secure, fast, and no downloads needed.