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Does CSS text-transform Work in HTML Email?
Each of the six `text-transform` values defined by MDN (`capitalize`, `uppercase`, `lowercase`, `none`, `full-width`, `full-size-kana`).
Quick Answer
Does text-transform work in HTML email?
The CSS text-transform property is supported in all major email clients tested. You can use it with confidence in your HTML emails.
Which Email Clients Support CSS text-transform?
CSS support for text-transform across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✓ Yes | ✓ Yes | — |
| Outlook (Windows) | ~ Partial | ? | — |
| Outlook (Mac / Web) | ✓ Yes | ✓ Yes | — |
| Apple Mail | ✓ Yes | ✓ Yes | — |
| Yahoo! Mail | ✓ Yes | ✓ Yes | — |
| Samsung Email | ? | ✓ Yes | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ✓ Yes | ✓ Yes | — |
| Fastmail | ✓ Yes | ? | — |
Notes
- #1 Partial. `lowercase` value is not supported.
Currently, only Firefox supports the `full-width` and `full-size-kana` property values. Web clients on Firefox will support these properties.
Frequently Asked Questions
Related CSS Properties
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support text-transform.