opacity in Outlook Classic
Not supported opacity is not supported in Outlook Classic.
Works in 19 of 21 · not supported in 2
Which clients
- Works
- Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Fastmail, Superhuman
- Not supported
- Outlook Classic, AOL Mail
Your reader in Outlook Classic sees the email without opacity, even if it looks right where you tested it.
The fix for Outlook Classic
Replace opacity with solid color equivalents
.overlay {
/* Use a semi-transparent color instead of opacity */
background-color: #808080;
/* Or for modern clients: rgba(0, 0, 0, 0.5) */
}Show the original
.overlay {
background-color: #000;
opacity: 0.5;
}The checker needs a computer screen.
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What Outlook Classic does with opacity
@emailens/engine 0.18.22 on the original code
Outlook Classic does not support "opacity".
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fix - Does border-spacing work in Outlook Classic?
Works in 17 of 21 · not supported in 2 · 2 untested
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fix - Does visibility work in Outlook Classic?
Works in 13 of 21 · not supported in 8
fix
Questions
- How many email clients support opacity?
- It works in 19 of 21, not supported in Outlook Classic and AOL Mail.
- What do I use instead of opacity in Outlook Classic?
- Replace opacity with solid color equivalents.
- Does opacity work in AOL Mail?
- opacity is not supported in AOL Mail. Closest to Outlook Classic: AOL Mail, which agrees on 206 of the 298 features both are tested on.
To see what else in your email Outlook Classic does not support, paste the whole email.
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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Feb 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping