# Zilla Slab font

> Mozilla's slab serif, drawn by Typotheque in five weights from Light to Bold, each paired with an italic.

Zilla Slab is a slab serif family designed by Typotheque for Mozilla, which uses it for its wordmark and headlines. Zilla Slab has five weights from Light 300 to Bold 700, each with an italic, as 10 static styles, not a variable font. Zilla Slab is released under the SIL Open Font License 1.1 and suits headlines and text.

## Facts

- Classification: [Slab Serif](https://trendhub.net/fonts/category/slab-serif)
- Designed by: Typotheque
- License: SIL Open Font License 1.1 (https://openfontlicense.org/open-font-license-official-text/)
- Styles: 10 (Light 300, Regular 400, Medium 500, SemiBold 600, Bold 700; with italics)
- Variable font: No
- Glyphs: 976
- Character sets: latin, latin-ext
- Last updated: 2025-09-05
- Official source: https://fonts.google.com/specimen/Zilla+Slab
- Page: https://trendhub.net/fonts/zilla-slab
- Tagged for: Headlines, Body text, Branding, Editorial

## About Zilla Slab

Zilla Slab is a slab serif family made as the core typeface of Mozilla, where it sets the wordmark, headlines and other design work. Typotheque designed it on the basis of one of the foundry's earlier slab serifs, and Mozilla leads the project; the copyright notice names The Mozilla Foundation. The letters carry flat, rectangular serifs, strokes of nearly even thickness and round, smooth bowls, with a two-storey a. In the specimen several numerals, among them 3, 4, 5, 7 and 9, drop below the baseline. The family has five weights, Light 300, Regular 400, Medium 500, SemiBold 600 and Bold 700, and every weight has an italic that the official notes describe as a true italic, for 10 styles delivered as static files. The fonts hold 976 glyphs in the Latin and Latin Extended character sets and are published under the SIL Open Font License 1.1.

## License

SIL Open Font License 1.1. Copyright 2017, The Mozilla Foundation

Allowed:
- Use the fonts in personal and commercial work, in print, on the web and in apps.
- Modify the fonts and build new versions from them.
- Redistribute the fonts, on their own or bundled with software, as long as the license text and copyright notice go with them.

Conditions:
- The fonts cannot be sold by themselves.
- A modified version must stay under the same license and cannot use a Reserved Font Name without the copyright holder's permission.
- The authors' names cannot be used to promote a modified version without permission.

Summary only, not legal advice. Full text: https://openfontlicense.org/open-font-license-official-text/

## Where it works

- **Headlines and wordmarks**: Mozilla sets its own wordmark and headlines in Zilla Slab; SemiBold and Bold give the flat serifs enough mass for large titles.
- **Articles and long pages**: Regular with its italic handles running text and emphasis, and the nearly even stroke thickness keeps letters solid at reading sizes.
- **Hierarchy inside one family**: Five weights between 300 and 700 separate titles, subheads, body copy and captions without bringing in a second typeface.
- **Quotes and captions in italic**: Each of the five weights has its own drawn italic, so a quotation can be set in Light Italic or Bold Italic and not only in the regular weight.
- **Sites in several European languages**: The Latin Extended set includes the letters needed for Turkish, Polish, Czech, Hungarian and Romanian alongside English, French and German.

## Things to know

- **Static files, no variable version**: The package holds 10 separate TTF files, one per style. Zilla Slab has no variable axes, so only the five named weights can be set.
- **The range runs from 300 to 700**: Light is the lightest cut and Bold the heaviest; the family has nothing thinner than 300 or heavier than 700.
- **Numerals drop below the line**: In the specimen the default figures are not all one height: digits such as 3, 4, 5, 7 and 9 descend below the baseline.
- **Designer and copyright holder differ**: The font's name table credits Typotheque as designer and manufacturer, while the copyright belongs to The Mozilla Foundation.

## FAQs

### Is Zilla Slab free for commercial use?

Yes. Zilla Slab is published under the SIL Open Font License 1.1, which allows use in personal and commercial work, modification and redistribution. Zilla Slab cannot be sold on its own, and modified versions stay under the same license.

### Who designed Zilla Slab?

Zilla Slab was designed by Typotheque in a project led by Mozilla. The copyright notice names The Mozilla Foundation.

### How many weights does Zilla Slab have?

Zilla Slab has five weights: Light 300, Regular 400, Medium 500, SemiBold 600 and Bold 700. Each has an italic, which makes 10 styles.

### Is Zilla Slab a variable font?

No. Zilla Slab is distributed as 10 static font files and has no variable axes.

### Which languages does Zilla Slab support?

Zilla Slab includes the letters needed for English and other Latin-script languages such as French, German, Spanish, Dutch, Danish, Turkish, Polish, Czech, Croatian and Lithuanian.

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Source: https://trendhub.net/fonts/zilla-slab (trendhub)