Why does Gmail remove CSS from emails?

Gmail strips CSS for security, speed, and consistency reasons. It uses a simplified rendering engine that only supports a narrow set of inline styles, ignoring most tags and complex layouts.

Can I use CSS in Gmail emails?

Only basic inline styles work reliably. External stylesheets, tags in , and complex CSS rules are stripped or ignored by Gmail’s rendering engine.

Why do my email layouts break in Gmail?

Layouts break because Gmail blocks `position`, `z-index`, `background-image`, and many other properties. Tables and inline styles are the only reliable way to preserve structure.

What’s the best way to test email rendering in Gmail?

Send test emails to real Gmail accounts across devices, or use tools like MailTester’s Inbox Placement Testing to simulate actual delivery and check formatting in real inboxes.

How does list hygiene affect email rendering?

Poor list hygiene leads to high bounce rates, which hurt sender reputation. This increases the chance Gmail filters or deprioritizes your messages—masking true rendering issues.

Does MailTester check how emails look in Gmail?

Yes. MailTester’s Inbox Placement Testing simulates real delivery to Gmail and reports on layout integrity, inbox placement, and deliverability.

Can I verify email lists before sending to test layouts?

Yes. Use MailTester’s bulk verification to clean your list first. Only send to valid, deliverable addresses to ensure your layout tests reflect real-world results.

How accurate is MailTester’s email verification?

MailTester achieves 98.9% accuracy in identifying valid, invalid, catch-all, and risky email addresses, helping maintain clean data and reliable sender reputation.

Do I lose my purchased credits on MailTester?

No. All purchased verification credits never expire, so you can verify your list at your own pace without time pressure.

What kinds of email addresses does MailTester catch?

It identifies invalid addresses, catch-all domains, disposable domains, and role-based emails—common sources of bounces and spam complaints.

Can MailTester integrate with my email platform?

Yes. MailTester integrates with Mailchimp, HubSpot, Klaviyo, and SendGrid, allowing real-time verification during signup or campaign prep.

Is there a free way to test MailTester?

Yes. You get 100 free verifications to start with no expiration, so you can test the platform’s accuracy and delivery impact with confidence.

Inbox placement by mailbox provider: Gmail, Outlook, Yahoo and spam filters

Why Gmail Strips Styles and How to Keep Email Layout Intact

Learn why Gmail strips styles from emails and exactly how to preserve your layout. Fix rendering issues with proven, practical techniques that work in.

MailTester Editorial Team · Aug 29, 2026 · 1 min read

Why Gmail Strips Styles and How to Keep Email Layout Intact

Why does Gmail strips CSS from emails?

You send a beautifully designed email. It looks perfect in your preview tool. Then you check it on Gmail—and the layout collapses. Why?

Gmail’s rendering engine prioritizes speed and security over full CSS support. It strips or ignores many modern CSS rules, especially those that could be exploited for phishing or tracking. The result? A stripped-down, often broken version of your email.

This isn’t unique to Gmail—but it’s among the most consistent offenders. Its web-native architecture and legacy constraints mean it disables or blocks inline styles in certain contexts, particularly when they’re defined in

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Why does Gmail strips CSS from emails?

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