TTC File

What are TTC files and how to open them

Are you having problems opening a TTC file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your TTC files.

What is a TTC file?

TTC files have multiple uses, and OpenType Font Collection is one of them. Read more about the other uses further down the page.

OpenType Font Collection

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open TTC files

Important: Different programs may use files with the TTC file extension for different purposes, so unless you are sure which format your TTC file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested seven different TTC openers which you will find listed below.

Last updated: August 5, 2026

All known file formats using extension .TTC

While OpenType Font Collection is a popular type of TTC-file, we know of 2 different uses of the .TTC file extension. Different software may use files with the same extension for different types of data.

TrueType Font Collection

TrueType Font Collection files (.TTC) package two or more fonts together in a single container so that fonts sharing many glyphs or other internal tables don't duplicate data. This makes them useful for font families or for languages like Japanese, where many characters are common across styles. Applications and operating systems that work with fonts can load each individual font ("sub-font") from the collection as if it were a standalone TrueType/OpenType font.

A .TTC file is produced by font design tools or conversion utilities that merge separate TrueType or OpenType font files into one collection. Once created, each sub-font's name, metrics, and character mapping are preserved, even as they point to shared components. The collection may include digital signatures for the entire file rather than per font, so that integrity and permissions apply globally.

Internally, a TTC file begins with a TTC header at offset 0 of the file. That header starts with the tag "ttcf", followed by a version (1.0 or 2.0), the number of fonts contained, and offsets locating each font's directory. Version 2.0 may also include a DSIG (digital signature) section with its tag ("DSIG"), length, and offset if a signature is present.

TTC opener for Windows

We have identified 2 TTC openers that are compatible with this specific type of TTC file.

Various apps that use files with this extension

These apps are known to open certain types of TTC files. Remember, different programs may use TTC files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about TTC file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.