HTML Email Previewer
Paste your HTML email template and render it instantly — in desktop or mobile width, in a safe sandboxed iframe. The OutSends previewer runs entirely in your browser.
How it works
Get started with HTML email previewer in a few simple steps.
Paste your HTML
Copy your email template's HTML code into the editor.
Click HTML Preview
Your email renders in a sandboxed iframe — scripts can't run, so previewing is safe.
Switch viewport
Toggle between desktop (680px) and mobile (375px) widths to check responsiveness.
Why use this free tool
Everything you need, integrated in one workspace.
- Instant rendering of any HTML email template
- Desktop and mobile viewport toggles
- Sandboxed iframe — no scripts run, fully safe
- Free forever, private, runs in your browser
Related tools
More free tools to power your email workflow.
Frequently asked questions
Is the HTML email previewer free?
Yes, it is completely free and works directly in your browser.
Is it safe to preview untrusted HTML?
Yes. The preview runs inside a sandboxed iframe with scripts disabled, so malicious HTML cannot execute.
Does it support CSS and images?
Your HTML renders as-is, including inline and embedded styles. External images load from their URLs.
Ready to send better emails?
OutSends helps you run cold email campaigns from your own Gmail, SMTP, or API provider — free, no credit card.