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@font-face in Outlook iOS

Not supported @font-face is not supported in Outlook iOS.

Works in 6 of 21 · not supported in 15

Which clients
Works
Apple Mail, Apple Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Superhuman
Not supported
Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook Classic, Outlook iOS, Outlook Android, Outlook for Mac, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Proton Mail, AOL Mail, Fastmail

Your reader in Outlook iOS sees the email without @font-face, even if it looks right where you tested it.

What to do instead in Outlook iOS

Add web-safe font fallback stack

instead 
/* Keep @font-face for clients that support it */
@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 {
  font-family: 'CustomFont', Arial, Helvetica, sans-serif;
}
Show the original
before 
@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 { font-family: 'CustomFont'; }

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What Outlook iOS does with @font-face

@emailens/engine 0.18.22 on the original code

Outlook iOS does not support "@font-face".

Your next question

Every feature in Outlook iOS · @font-face in every client

Questions

How many email clients support @font-face?
It works in 6 of 21, not supported in 15.
What do I use instead of @font-face in Outlook iOS?
Add web-safe font fallback stack.
Does @font-face work in Outlook Android?
@font-face is not supported in Outlook Android. Closest to Outlook iOS: Outlook Android, which agrees on 270 of the 296 features both are tested on.

To see what else in your email Outlook iOS does not support, paste the whole email.

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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 19 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping