loc.gov draws its headings in Roboto Slab and its body text in Open Sans. It uses 2 fonts in all. We measured it on November 4, 2026.
The fonts loc.gov draws
| Font | Used for | Share of its custom-font text | Licence | How common |
|---|---|---|---|---|
| Open Sans | Body text | 82.2% | Open source | 26 of 845 sites (rank 3) |
| Roboto Slab | Headings | 17.8% | Open source | – |
Share is how much of the page’s custom-font text each font draws. System fonts and icon fonts are never counted. Each site was opened twice in a real browser and Chrome was asked which font file drew each piece of text. We count a font for a site only if both runs saw it and it drew at least 2% of the site’s custom-font text. The full method.
Can I use the same fonts?
- Open Sans is open source and free to use, including commercially. Get it from Google Fonts.
- Roboto Slab is open source and free to use, including commercially. Get it from Google Fonts.
loc.gov among nonprofit, government and reference sites
loc.gov is one of the 37 nonprofit, government and reference sites we measured. Across them, Open Sans is the most used font you can get, on 6 of the 37 (16%). All the fonts nonprofit, government and reference sites use.
What pairing does loc.gov use?
Roboto Slab for headings with Open Sans for body text does not repeat on another analyzed site, so there is no shared pairing to show. Pairings that do repeat.
Other nonprofit, government and reference sites we measured
- merriam-webster.com Open Sans, Playfair Display
- nationalarchives.gov.uk Open Sans, Supria Sans
- redcross.org Roboto, Open Sans
- worldbank.org Open Sans
- worldwildlife.org Open Sans
- arxiv.org IBM Plex Sans
See the fonts on all 845 sites.
FAQ
What font does loc.gov use?
loc.gov draws its headings in Roboto Slab and its body text in Open Sans. It uses 2 fonts in all: Open Sans, Roboto Slab. We measured it on November 4, 2026.
Is Roboto Slab free?
Yes. Roboto Slab is open source and free for commercial use, according to Google Fonts.
What font pairing does loc.gov use?
Roboto Slab for headings and Open Sans for body text. It does not repeat on another analyzed site.
Can I use the same fonts as loc.gov on my own site?
Only if the licence allows it. Free and open-source fonts can be used freely. Commercial fonts need your own licence, even though you can see the file on loc.gov. Each font's licence is on this page, from its source.
How do you know which font loc.gov uses?
We opened loc.gov in a real browser and asked Chrome which font file drew each piece of text, twice in separate sessions. A font counts only if both runs saw it and it drew at least 2% of the site's custom-font text.
Can I check a different website?
Yes. Paste its address into the free font finder.