Free HTML Email Preview Tool
Free HTML Email Preview Tool
Our free HTML email preview tool lets you paste any HTML email template and instantly preview how it looks on desktop, mobile, and tablet — without sending a single email. Test dark mode rendering, run A/B version comparisons, and check for common template issues all in one place.
Email templates often look very different across devices and screen sizes. A layout that looks perfect on a desktop monitor may be completely broken on a mobile phone. Our preview tool simulates different viewport sizes so you can catch layout issues before your campaign goes out.
Email developers and designers use this tool to iterate quickly on templates without needing to send test emails. Marketers use it to review templates before handing them off for sending. The built-in template analysis checks for missing DOCTYPE declarations, missing viewport meta tags, and other common issues that affect deliverability and rendering.
How to Use This Tool
- Paste your HTML email code into the editor on the left.
- Click Generate Preview.
- Switch between Desktop, Mobile, and Tablet tabs to check the layout.
- Toggle Dark Mode to test dark mode rendering.
- Review the Template Analysis panel for issues and accessibility warnings.
Frequently Asked Questions
Does this show how the email looks in Gmail or Outlook?
The preview shows how the HTML renders in a browser at different viewport sizes. For client-specific rendering (especially Outlook), use our Email HTML Code Analyzer to check for compatibility issues.
What is A/B testing mode?
A/B testing mode lets you paste two versions of an email template and switch between them in the preview to compare layouts and designs side by side.
Can I load pre-built templates?
Yes. Click the Templates button to load pre-built templates including basic, newsletter, promotional, welcome, and order confirmation layouts.