Free HTML Email Checker
Test and validate your HTML email templates. Preview layouts with Gmail-style sanitization, all in your browser.
HTML is sanitized in your browser to match common Gmail rules. Unsupported tags and styles are stripped before preview.
| Count | Level | Message | Rule |
|---|---|---|---|
| Paste HTML to see compatibility notes. | |||
Gmail may ignore unsupported CSS even if it renders in other email clients.
Developer Tools
More browser-based utilities for notifications and email testing.
Why Use an HTML Email Checker?
Email clients strip unsupported markup and CSS. This free email template checker previews how Gmail sanitizes your HTML code so you can catch layout breaks before you send.
Email clients each have their own HTML sanitizer and CSS support matrix. Testing your email templates with Gmail-style rules helps you spot code that gets removed, styles that are ignored, and layouts that collapse in real inboxes.
Email Template Validation
Check your HTML email templates against Gmail-style sanitization rules. See exactly which tags and attributes are stripped.
HTML Code Checker
Validate your email HTML code for common issues. Test table structures, inline styles, and formatting before sending.
Common issues this email tester catches
- Unsupported tags like scripts, forms, and media embeds.
- CSS properties that Gmail ignores or rewrites.
- Broken table layouts and spacing when `gap` is removed.
- Custom fonts that fall back to system defaults.
Email Testing Questions
Common questions about testing and validating HTML email templates.
How do I test HTML email before sending?
Paste your HTML into the checker above to see how Gmail-style sanitization affects your markup. The tool strips unsupported tags and CSS in real time, so you can fix layout issues before the email reaches an inbox.
What HTML tags does Gmail strip?
Gmail removes <script>, <form>, <iframe>, <video>, and <audio> tags. It also strips <style> blocks unless they use supported CSS properties. Inline styles are the safest approach for email styling.
Why does my email look different in Outlook?
Outlook uses Microsoft Word's rendering engine, which has limited CSS support. Flexbox, grid, and many modern properties are ignored. Stick to table-based layouts with inline styles for reliable rendering across Outlook versions.
Email Layout Resources
Keep your email notifications consistent with these guides and compatibility references.
Email Notifications API
Send transactional email notifications across providers with a single API.
Email Client Support Matrix
Reference which HTML and CSS features each email client supports.