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@font-face in Gmail iOS

Not supported @font-face is not supported in Gmail 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 Gmail iOS sees the email without @font-face, even if it looks right where you tested it.

What to do instead in Gmail 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 Gmail iOS does with @font-face

@emailens/engine 0.18.22 on the original code

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

Your next question

Every feature in Gmail 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 Gmail iOS?
Add web-safe font fallback stack.
Does @font-face work in Gmail Android?
@font-face is not supported in Gmail Android. Closest to Gmail iOS: Gmail Android, which agrees on 273 of the 300 features both are tested on.

To see what else in your email Gmail 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