CSS Properties

transform

CSS property · 8 supported, 1 partial, 12 unsupported across 21 clients

8 of 21 email clients render transform fully (Sep 2, 2026 data); it breaks outright in Gmail, Gmail Android, Gmail iOS and 9 more.

3/7 webmail, 3/6 desktop, 2/8 mobile clients support transform fully.
Unsupported in Gmail, Gmail Android, Gmail iOS, Outlook 365 and 8 more.
Partial in Superhuman, behavior differs from browsers, test before relying on it.
Outlook Classic (Word engine, supported to at least 2029) does not fully support transform, and its replacement changes little here; see the deprecation diff.
Documented before/after fixes on this page cover 21 clients, including Gmail and Gmail Android.
Across all clients, only 6 of 298 tracked HTML/CSS features render identically everywhere.

Source: caniemail.com (MIT), via the Emailens engine. Last tested upstream Feb 28, 2019, synced by Emailens Sep 2, 2026.

Client Support

Client	Category	Engine	Support
Gmail	webmail	Gmail Web	Unsupported
Gmail Android	mobile	Gmail Mobile	Unsupported
Gmail iOS	mobile	Gmail Mobile	Unsupported
Outlook 365	webmail	Outlook Web	Unsupported
Outlook (New)	desktop	Outlook Web	Unsupported
Outlook Classic	desktop	Microsoft Word	Unsupported
Outlook iOS	mobile	Outlook Mobile	Unsupported
Outlook Android	mobile	Outlook Mobile	Unsupported
Outlook for Mac	desktop	WebKit	Supported
Apple Mail	desktop	WebKit	Supported
Apple Mail iOS	mobile	WebKit	Supported
Yahoo Mail	webmail	Yahoo	Unsupported
Yahoo Mail Android	mobile	Yahoo	Unsupported
Yahoo Mail iOS	mobile	Yahoo	Unsupported
Samsung Mail	mobile	Samsung	Supported
Thunderbird	desktop	Gecko	Supported
HEY Mail	webmail	WebKit	Supported
Proton Mail	webmail	Proton	Supported
AOL Mail	webmail	AOL	Unsupported
Fastmail	webmail	Fastmail	Supported
Superhuman	desktop	Blink	Partial

Client-by-client behaviour for transform

Fully supports transform (8): Outlook for Mac, Apple Mail, Apple Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Fastmail.

Partial support (1): Superhuman. Expect rendering quirks unique to each engine. Partial support typically means a subset of values, an ignored shorthand, or sanitizer-specific rewrites.

No support (12): Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook Classic, Outlook iOS, Outlook Android, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail. Plan fallbacks for these clients before relying on transform in production sends.

Fixes & Workarounds

Gmail

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Gmail Android

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Gmail iOS

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Outlook 365

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Outlook (New)

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Outlook Classic

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Outlook iOS

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Outlook Android

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Yahoo Mail

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Yahoo Mail Android

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Yahoo Mail iOS

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

AOL Mail

Unsupported

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Superhuman

Partial

CSS transforms are not supported in email. Pre-render the effect as an image.

Before (Broken)

before.html

3 lines

<div style="transform: rotate(45deg);">
  Rotated content
</div>

After (Fixed)

fixed.html

4 lines

<!-- Pre-render rotated content as an image -->
<img src="rotated-content.png" width="200" height="200"
  alt="Rotated content"
  style="display: block; border: 0;" />

Pre-render transformed states as images or use table layout

Production guidance for transform

transform is a CSS property. Across the email client matrix, 8 of 21 tracked clients support it fully, 1 only partially, and 12 not at all. The clients most likely to require a workaround for this feature are Gmail, Gmail Android, Gmail iOS. Each of them needs a tailored fallback. See the per-client examples above for the specific code fix Emailens recommends.

When in doubt, ship a baseline that renders without transform and treat it as progressive enhancement on clients where support is verified. Emailens automatically detects cross-client divergence on this feature when you preview an email, so you can see exactly which template paths break before a campaign goes out.

Related Features

!important accent-color align-items animation aspect-ratio backdrop-filter background background-blend-mode

Check your own HTML for transform

Paste your own, or run the sample below. Analyzed in this page, with no signup and nothing stored.

Zero-Friction Engine Preview

Test your transform layout across 21 email clients

Preview rendering, catch CSS issues, and see how transform displays across Outlook, Gmail, and Apple Mail. Free, no account needed.

Instant live preview · No signup required · 21 email engines

Last tested upstream: Feb 28, 2019 · Last synced by Emailens: Sep 2, 2026

caniemail.com (MIT) records Feb 28, 2019 as the last time transform was tested in a real client, 7 years before this sync. Syncing copies that result forward, it does not re-test it. Carried in @emailens/engine data v0.12.2.