What Is a .ttf File? .ttf Format, MIME & How to Open

Quick facts

Extension.ttf

File typeTrueType Font

MIME typefont/ttf

CategoryFont

Charset—

CompressibleYes

Format familyfont

What is .ttf

What is a .ttf file?

A .ttf file is a TrueType Font — TrueType outline font format.

In the mime-db registry it maps to font/ttf, and it is marked as compressible. When serving .ttf over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to font/ttf — and is delivered over HTTP via the Content-Type header.

How to open .ttf files

Use Font Book or Windows Font Viewer to open and edit .ttf files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: font/ttf

Common software that reads/writes .ttf:

Font BookWindows Font Viewer

Relation chain

.ttfextension of

format

fontserved as

mime type

font/ttfsent via header

http header

Related extensions

Embedded OpenType Font

Related MIME types

font/ttf

.ttf

Common uses

Web typography
Desktop fonts
Print design

How to edit .ttf files

Open the file with Font Book, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .ttf files

Create a new file and save it with the .ttf extension, or export this format from Font Book.

Frequently asked questions

What programs can open .ttf files?

Common options include Font Book, Windows Font Viewer. You can also open many of these files with built-in viewers or a browser.

How do I create a .ttf file?

Create a new file in any text editor or the app that owns the format and save it with the .ttf extension.

What is the relationship between .ttf and the font/ttf MIME type?

font/ttf is the media type identifier used for .ttf files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-08-18

Explore this reference

What is a .ttf file?

What programs can open .ttf files?

How do I create a .ttf file?

What is the relationship between .ttf and the font/ttf MIME type?

Related extensions

Related MIME types

Related headers

Related methods

Related status codes