<link> in Proton Mail
Not supported <link> is not supported in Proton Mail.
Works in 3 of 21 · not supported in 18
Which clients
- Works
- Outlook Classic, Apple Mail, Apple Mail iOS
- Not supported
- Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman
Your reader in Proton Mail sees the email without <link>, even if it looks right where you tested it.
The fix for Proton Mail
Inline all CSS instead of using external stylesheets
<div style="max-width: 600px; margin: 0 auto;">
<div style="background-color: #6d28d9; padding: 32px;"></div>
</div>Show the original
<head>
<link rel="stylesheet" href="styles.css" />
</head>The checker needs a computer screen.
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What Proton Mail does with <link>
@emailens/engine 0.18.22 on the original code
Proton Mail does not support external stylesheets.
Your next question
- Does <form> work in Proton Mail?
Works in 10 of 21 · partial in 4 · not supported in 7
fix - Does <video> work in Proton Mail?
Works in 3 of 21 · partial in 2 · not supported in 16
fix - Does <input type="checkbox"> work in Proton Mail?
Works in 16 of 21 · partial in 1 · not supported in 3 · 1 untested
- Does <input type="hidden"> work in Proton Mail?
Works in 16 of 21 · partial in 1 · not supported in 3 · 1 untested
- Does <input type="radio"> work in Proton Mail?
Works in 16 of 21 · partial in 1 · not supported in 3 · 1 untested
- Does <input type="reset"> work in Proton Mail?
Works in 15 of 21 · partial in 2 · not supported in 3 · 1 untested
Questions
- How many email clients support <link>?
- It works in 3 of 21, not supported in 18.
- What do I use instead of <link> in Proton Mail?
- Inline all CSS instead of using external stylesheets.
- Does <link> work in Apple Mail?
- <link> works in Apple Mail. Closest to Proton Mail: Apple Mail, which agrees on 203 of the 300 features both are tested on.
To see what else in your email Proton Mail does not support, paste the whole email.
No signup · Five clients free, Outlook Classic included · All 21 with an account
The checker needs a computer screen.
caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 21 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping