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Does CSS word-break Work in HTML Email?
Prevents or allows words to be broken over multiple lines.
Quick Answer
Does word-break work in HTML email?
The CSS word-break property is supported in Gmail, Outlook (Windows), Thunderbird, ProtonMail, and others. It is NOT supported in Yahoo! Mail. Always include a safe fallback for unsupported clients.
Which Email Clients Support CSS word-break?
CSS support for word-break across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✓ Yes | ~ Partial | — |
| Outlook (Windows) | ✓ Yes | ? | — |
| Outlook (Mac / Web) | ~ Partial | ~ Partial | — |
| Apple Mail | ~ Partial | ~ Partial | — |
| Yahoo! Mail | ✗ No | ✗ No | — |
| Samsung Email | ? | ~ Partial | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ✓ Yes | ~ Partial | — |
| Fastmail | ✓ Yes | ? | — |
Notes
- #1 Supported. But Gmail adds `<wbr>` every 30 characters.
- #2 Buggy. Supported but a `word-wrap:break-word` is applied, making it look like `break-all`.
- #3 Partially supported. Only `word-break:break-all` works.
- #4 Buggy. Every value is replaced by `break-word`.
Frequently Asked Questions
Related CSS Properties
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