How many email clients support @font-face?

It works in 6 of 21, not supported in 15.

Does @font-face work in Outlook iOS?

@font-face is not supported in Outlook iOS. Closest to Outlook Android: Outlook iOS, which agrees on 270 of the 296 features both are tested on.

@font-face in Outlook Android

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

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 Android sees the email without @font-face, even if it looks right where you tested it.

What to do instead in Outlook Android

Add web-safe font fallback stack

instead

8 lines

/* 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

5 lines

@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 { font-family: 'CustomFont'; }

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What Outlook Android does with @font-face

@emailens/engine 0.18.22 on the original code

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

Your next question

Every feature in Outlook Android · @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 Android?: Add web-safe font fallback stack.
Does @font-face work in Outlook iOS?: @font-face is not supported in Outlook iOS. Closest to Outlook Android: Outlook iOS, which agrees on 270 of the 296 features both are tested on.

To see what else in your email Outlook Android 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