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Does CSS border-collapse Work in HTML Email?
Sets whether cells inside a `<table>` have shared or separate borders.
Quick Answer
Does border-collapse work in HTML email?
The CSS border-collapse property is supported in all major email clients tested. You can use it with confidence in your HTML emails.
Which Email Clients Support CSS border-collapse?
CSS support for border-collapse across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✓ Yes | ✓ Yes | — |
| Outlook (Windows) | ✓ Yes | ? | — |
| Outlook (Mac / Web) | ✓ Yes | ✓ Yes | — |
| Apple Mail | ✓ Yes | ✓ Yes | — |
| Yahoo! Mail | ✓ Yes | ✓ Yes | — |
| Samsung Email | ? | ✓ Yes | — |
| Thunderbird | ✓ Yes | ? | — |
| ProtonMail | ✓ Yes | ✓ Yes | — |
| Fastmail | ? | ? | — |
Frequently Asked Questions
Related CSS Properties
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support border-collapse.
Building a new email instead of checking an existing one? MailViewr's Email Builder only lets you use CSS that's known to render across clients, so border-collapse can't sneak into your markup by accident. Open the Email Builder →