sans-serif

Segoe UI

Segoe UI

Segoe UI — Microsoft's corporate user-interface typeface, shipped as the default system font on Windows since Windows Vista and used throughout the Microsoft 365, Fluent, and Office product surfaces. Distributed only via the operating system; specified in CSS as a named family with a system-font fallback stack for non-Windows consumers.

Aa Bb Cc

The quick brown fox jumps over 13 lazy dogs.

ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz

0123456789 — • · → ← ⇄ ✓ ✗ ! ? & @ # $ %

Weights & styles

300
Light
The quick brown fox
400
Regular
The quick brown fox
600
SemiBold
The quick brown fox
700
Bold
The quick brown fox

Source & fallback

Source

Kind
system

Fallback stack

  1. Segoe UI primary
  2. system-ui fallback 1
  3. Inter fallback 2
  4. Helvetica Neue fallback 3
  5. Arial fallback 4
  6. sans-serif fallback 5

Provenance

Source
https://fluent2.microsoft.design/typography
License
Proprietary — Microsoft Corporation, distributed with Windows
Attribution
Segoe UI is a trademark of the Microsoft group of companies, licensed from Monotype. It is bundled with Microsoft Windows and Microsoft 365 products. External / cross-platform consumers must fall back to a comparable system sans (system-ui, Inter, or the OS-default) rather than redistribute the font binaries.
Imported
2026-05-17
Notes
Fluent 2 specifies Segoe UI Variable as the typeface for modern Windows surfaces; older Microsoft properties still call out the static Segoe UI weights (Light, Regular, Semibold, Bold). The `system` source kind below leans on Windows / system-ui delivery and a humanist-sans fallback for non-Windows clients.