SixLabors.Fonts

SixLabors.Fonts is a cross-platform library for loading, measuring, and laying out fonts and text. It supports TrueType and OpenType fonts (including CFF1 and CFF2 outlines), WOFF/WOFF2 web fonts, variable fonts, color fonts (COLR v0/v1 and SVG), and TrueType hinting. The library provides a full OpenType layout engine with GSUB/GPOS support, advanced text shaping for complex scripts, and bidirectional text rendering.

Fonts also exposes high-level text layout primitives for applications that need more than a single bounding box. Callers can measure advance, ink bounds, renderable bounds, lines, words, graphemes, and glyphs; reuse prepared text across multiple wrapping widths; inspect the resolved font used to shape and render fallback glyphs; and use built-in hit testing, caret placement, and selection geometry.

License

• Fonts is licensed under the Six Labors Split License, Version 1.0

Support Six Labors

Support the efforts of the development of the Six Labors projects.

• Purchase a Commercial License :heart:
• Become a sponsor via GitHub Sponsors :heart:
• Become a sponsor via Open Collective :heart:

Documentation

• Detailed documentation for the Fonts API is available. This includes additional conceptual documentation to help you get started.
• Our Samples Repository is also available containing buildable code samples demonstrating common activities.

Questions

• Do you have questions? We are happy to help! Please join our Discussions Forum.
• Please read our Contribution Guide before opening issues or pull requests!

Code of Conduct

This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.

Installation

Install stable releases via Nuget; development releases are available via Feedz.io.

Package Name	Release (NuGet)	Nightly (Feedz.io)
SixLabors.Fonts

Manual build

If you prefer, you can compile Fonts yourself (please do and help!)

• Using Visual Studio 2022
  • Make sure you have the latest version installed
  • Make sure you have the .NET 8 SDK installed

Alternatively, you can work from command line and/or with a lightweight editor on both Linux/Unix and Windows:

• Visual Studio Code with C# Extension
• .NET Core

To clone Fonts locally, click the "Clone in [YOUR_OS]" button above or run the following git commands:

git clone https://github.com/SixLabors/Fonts

If working with Windows please ensure that you have enabled log file paths in git (run as Administrator).

git config --system core.longpaths true

Submodules

This repository contains git submodules. To add the submodules to the project, navigate to the repository root and type:

git submodule update --init --recursive

LFS

This repository uses LFS Large File Storage. To configure it for the project, navigate to the repository root and type:

git lfs install

git lfs pull

Features

• Reading font description (name, family, subname etc plus other string metadata).
• Loading TrueType fonts and OpenType fonts with CFF1 and CFF2 outlines.
• Loading WOFF and WOFF2 web fonts.
• Loading all compatible fonts from the local machine store.
• Support for variable fonts (fvar, gvar, cvar, CFF2 variations).
• Support for color fonts (COLR v0/v1 and SVG).
• TrueType hinting (FreeType v40-compatible interpreter).
• Support for advanced OpenType layout via glyph substitution (GSUB) and glyph positioning (GPOS).
• Advanced text shaping for complex scripts (Indic, Myanmar, Universal Shaping Engine).
• Support for ligatures and kerning.
• Support for rendering left to right, right to left, and bidirectional text.
• Support for line breaking based on UAX 14.
• Support for reusable prepared text layout via TextBlock.
• Text measurement APIs for advance bounds, ink bounds, renderable bounds, line metrics, word metrics, grapheme metrics, and glyph metrics.
• Glyph and grapheme metrics expose the resolved font used to shape and render each entry, including fallback fonts.
• Text interaction helpers for hit testing, caret positioning, caret movement, and selection bounds.
• Support for wrapping, trimming, ellipsis, hyphenation, tab width, tracking, line height, and horizontal and vertical layout modes.

API Examples

Read font description

FontDescription description = null;
using(var fs = File.OpenRead("Font.ttf")){
    description = FontDescription.Load(fs); // once it has loaded the data the stream is no longer required and can be disposed of
}

string name = description.FontName(CultureInfo.InvariantCulture);

Populating a font collection

FontCollection fonts = new FontCollection();
FontFamily font1 = fonts.Add("./path/to/font1.ttf");
FontFamily font2 = fonts.Add("./path/to/font2.woff");

How can you help?

Please... Spread the word, contribute algorithms, submit performance improvements, unit tests.

Projects using SixLabors.Fonts

• SixLabors.ImageSharp.Drawing - cross platform, fully managed, image drawing library.

The SixLabors.Fonts Team

• Scott Williams
• Dirk Lemstra
• Anton Firsov
• James Jackson-South
• Brian Popow