Sphinx of black quartz, judge my vow.
The quick brown fox jumps over the lazy dog. 0123456789
Weights:
100 900
CSS
font-family: 'ProtonSans', sans-serif;proton.me/
proton.me
16 fonts found
Proton: Privacy by default
Over 100 million people use Proton to stay private and secure online. Get a free Proton account and take back your privacy.
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What fonts does Proton use?
Proton.me uses ProtonSans, ProtonSerif, Inter and ABC Arizona Flare as its main typefaces. Consolas, Menlo, Segoe UI Emoji and Apple Color Emoji are declared as fallbacks. 16 fonts detected, last checked Sep 26, 2026.
Proton, a leader in online privacy, utilizes a thoughtful selection of fonts to connect with its audience of security-conscious users. The primary fonts, Inter and ABC Arizona Flare, alongside the custom ProtonSans and ProtonSerif, create a distinctive visual identity. These choices reflect the brand's commitment to clarity and accessibility. The variety in weights from 100 to 900 in ProtonSans and 200 to 700 in ProtonSerif enhances readability, aligning with Proton's mission to empower individuals in the digital realm.
Sphinx of black quartz, judge my vow.
The quick brown fox jumps over the lazy dog. 0123456789
Weights:
200 700
CSS
font-family: 'ProtonSerif', sans-serif;Weights:
400
License:OFL / Apache 2.0
CSS
font-family: 'Inter', sans-serif;Sphinx of black quartz, judge my vow.
The quick brown fox jumps over the lazy dog. 0123456789
Weights:
400
CSS
font-family: 'ABC Arizona Flare', sans-serif;Fallback fonts
These fonts are listed in the CSS as backups. The browser only falls back to them if the main fonts above fail to load.
Font stacks
The cascading font order declared in CSS. Browsers try each font left-to-right until one is available.
Legend:AaCustom font (primary)AaSystem fontkwCSS keyword (generic)
ProtonSans→ProtonScript→ui-sans-serif→system-ui→sans-serif→Apple Color Emoji→Segoe UI Emoji→Segoe UI Symbol→Noto Color Emoji
ProtonCampaign→ProtonScript→ui-sans-serif→system-ui→sans-serif→Apple Color Emoji→Segoe UI Emoji→Segoe UI Symbol→Noto Color Emoji
Explore ProtonSans
Frequently asked questions about Proton.me's fonts
What fonts does Proton.me use?
Proton.me uses ProtonSans, ProtonSerif, Inter and ABC Arizona Flare as its main typefaces. Consolas, Menlo, Segoe UI Emoji and Apple Color Emoji are declared as fallbacks. 16 fonts detected, last checked Sep 26, 2026.
What fonts does proton.me use?
Proton.me primarily uses Inter, ABC Arizona Flare, ProtonSans, and ProtonSerif in their design. These custom fonts enhance readability and brand identity.
Where can I get the fonts used by proton.me?
The primary fonts like Inter and ProtonSans can be found on platforms like Google Fonts and GitHub. Custom fonts may be available through Proton's resources.
How do ProtonSans and ProtonSerif compare to other fonts?
ProtonSans is versatile with weights from 100 to 900, while ProtonSerif offers a range from 200 to 700. They provide unique alternatives to common sans-serif and serif fonts.
Are there fallback fonts used by proton.me?
Yes, proton.me uses fallback fonts such as Consolas, Menlo, and Segoe UI Emoji to ensure compatibility across different devices and browsers.