Zilla Slab
CategorySlab serif
ClassificationMechanistic, Humanist
Designer(s)Peter Biľak, Nikola Djurek
Commissioned byMozilla Foundation
Date created2017
LicenseSIL Open Font License
Design based onTesla Slab
VariationsZilla Slab Highlight
Latest release version1.002
Latest release dateAugust 23, 2017; 6 years ago (2017-08-23) [1]

Zilla Slab is a free to use, open source slab serif font commissioned by the Mozilla Foundation[2] as a part of their rebranding process from mid-2016 to 2017.[3][4][5] It was created in 2017 by Peter Biľak and Nikola Djurek,[2] typeface designers for the Typotheque foundry. It is inspired by the Tesla Slab font,[6][2] also originally designed by Typotheque. Its variant, Zilla Slab Highlight, features a unique ligature in its bold weight, where the character sequence “ill” will turn into “://”, purposely intended for using the stylized Mozilla wordmark as “moz://a”.[2]


Zilla Slab is used as the branding font for Mozilla Foundation, featured in its logo as well as their other products and projects, such as MDN Web Docs and Common Voice, alongside Inter and Metropolis.[7][8]

As of February 21, 2018, Ohio University started using Zilla Slab as their secondary font of choice.[9]


Zilla Slab is available on GitHub,[10] Google Fonts,[11] and through Mozilla's CDN.[12] Its variant, Zilla Slab Highlight, is also sourced in the same GitHub repository, and available on Google Fonts as well.[13]

See also


  1. ^ "Release v1.002 · mozilla/zilla-slab". GitHub. 2017-08-23. Retrieved 2021-03-19.
  2. ^ a b c d Gorlovetsky, Yuliya (2017-07-10). "Zilla Slab: A common language through a shared font - Mozilla Open Design". Mozilla Open Design. Retrieved 2019-07-20.
  3. ^ Johnson Banks Corporation. "Mozilla | Johnson Banks". Retrieved 2019-07-20.
  4. ^ Johnson, Michael (2016-06-10). "Designing in the Open". Mozilla Open Design. Retrieved 2019-07-20.
  5. ^ Johnson, Michael (2016-07-06). "Going deeper into Mozilla's identity problem - Mozilla Open Design". Mozilla Open Design. Retrieved 2019-07-20.
  6. ^ "Typotheque: New Wordmark and Typeface for Mozilla". Typotheque. 2017-01-24. Retrieved 2019-07-20.
  7. ^ Mozilla. "Typography - Protocol Design System". Mozilla Protocol - Protocol Design System. Retrieved 2019-07-21.
  8. ^ Mozilla. "Typography - Mozilla Dot Design". Mozilla Dot Design. Retrieved 2019-07-21.
  9. ^ Morris, Renea (2018-02-21). "OHIO: Compass | Branding OHIO with updated color palettes and typography". Ohio University. Retrieved 2019-07-21.
  10. ^ "mozilla/zilla-slab: Mozilla's Zilla Slab Type Family". GitHub. Retrieved 2019-07-20.
  11. ^ Typotheque. "Zilla Slabs - Google Fonts". Google Fonts. Retrieved 2019-07-20.
  12. ^ "Mozilla CDN". Retrieved 2019-07-20.
  13. ^ Typotheque. "Zilla Slab Highlight - Google Fonts". Google Fonts. Retrieved 2019-07-20.