Free Email Preview Tool

Preview Your Emails
Before They Land

Test HTML emails, craft perfect preview text, and preview subject lines exactly as your subscribers will see them — across every major email client.

Start Previewing Free See How It Works
15+ Email Clients
100% Free to Use
∞ Previews
Live Tool

HTML Email Preview Tool

Paste your HTML email code or compose directly. See how it renders and how your preview text and subject line appear in the inbox.

39 chars — ideal: 40–60
88 chars — ideal: 85–140

Write your email content here...

103/140 characters
Email Render Preview
Process

How Email Preview Works

From composing to testing, our workflow makes email preview testing effortless in three simple steps.

01
✍️

Compose or Paste

Write your email from scratch using our rich compose editor, or paste your existing HTML email code directly into the tool.

→
02
🔎

Set Preview Text

Enter your subject line and email preview text. Our character counter guides you to the optimal length for maximum inbox impact.

→
03
📬

Preview & Test

Instantly see how your email renders across desktop, tablet, and mobile views. Test subject line preview and preheader text side by side.

Features

Everything You Need for Email Preview

Professional email preview tools packed into one free, easy-to-use platform.

🖥️

HTML Email Preview

Render your raw HTML email code in a live, sandboxed preview frame. See exactly how your email will look — fonts, images, buttons, and all — before a single send.

  • Live iframe rendering
  • Desktop, tablet & mobile views
  • No external dependencies
📝

Preview Text Editor

Craft and preview your email preheader text with real-time character counting and inbox simulation.

📏

Subject Line Preview

See your subject line exactly as it appears in Gmail, Apple Mail, and Outlook — with truncation warnings.

📱

Mobile Email Preview

Switch to mobile view to ensure your email is fully responsive and readable on small screens.

✏️

Rich Compose Editor

Don't have HTML? Compose your email visually using our built-in rich text editor and preview instantly.

⬇️

Download & Export

Copy the rendered HTML to clipboard or download your email file directly. Ready to plug into Mailchimp, HubSpot, or any ESP.

  • One-click HTML copy
  • Download as .html file
  • Works with all major ESPs
Best Practices

Email Preview Text Best Practices

Master the art of the preheader. Your preview text is prime inbox real estate — here's how to use it right.

✅ Do
  • Keep preview text between 85–140 characters
  • Complement your subject line — don't repeat it
  • Lead with the most compelling information
  • Include a subtle call-to-action or hook
  • Personalize when possible ("John, your cart is waiting")
  • Test on both desktop and mobile views
  • Use preview text to add urgency or curiosity
❌ Don't
  • Don't repeat the exact subject line word-for-word
  • Don't leave the preheader as default "View in browser"
  • Don't exceed 140 characters — it gets cut off
  • Don't use all caps or excessive punctuation!!!
  • Don't use spammy words like "FREE!!!" or "Click Now"
  • Don't leave the preview text blank
  • Don't front-load unsubscribe links
💡
Pro Tip: The ideal email preview text acts as a second subject line. While your subject line grabs attention, the preview text seals the deal. Think of them as a headline + subheadline combo working together to drive opens.

Preview Text Examples by Industry

Industry Subject Line Good Preview Text
E-commerce Flash Sale — 50% Off Today Your favorite items are waiting. Shop before midnight and save on 500+ products.
SaaS New Feature: Team Dashboards Collaborate faster with your team. Set up your shared dashboard in under 2 minutes.
Newsletter This Week in Tech 🗞️ AI tools that actually work, a deep dive on GPT-5, and 3 reads you won't regret.
Event You're Invited: Annual Summit Join 2,000+ industry leaders. Early-bird tickets end Friday — grab yours now.
Finance Your Monthly Statement Your account summary for March is ready. Total balance: $4,312.50. Tap to review.
Subject Line Preview

Email Subject Line Preview

How your subject line appears varies across email clients. Test and optimize for every major inbox.

Gmail
Sender Your weekly digest is here ✨ — Catch up on everything this week...
9:41 AM
Max ~70 chars subject line on desktop
Outlook
Sender Your weekly digest is here ✨ Catch up on everything this week...
9:41 AM
Max ~60 chars subject line on desktop
Apple Mail
Sender 9:41 AM
Your weekly digest is here ✨ Catch up on everything this week — top stories, tools, and tips.
Shows longer preview text on desktop
iOS Mail
Sender 9:41 AM
Your weekly digest…
Catch up on everything this week...
Max ~35 chars subject on mobile
Learn

The Complete Guide to Email Preview

Everything you need to know about email preview text, HTML email preview, and testing your emails effectively.

Fundamentals

What Is Email Preview Text?

Email preview text — also called preheader text — is the short snippet that appears beneath or beside your subject line in inbox listings. It's your second chance to convince a reader to open your email.

Most email clients display between 40–140 characters of preview text, depending on the device and app. On desktop Gmail, you might see up to 100 characters; on iOS, it may be truncated to 50.

Because this text is pulled from the first visible content in your email body, it must be carefully crafted — or set explicitly using a hidden preheader element in your HTML.

HTML Technique

How to Add Preview Text in HTML Email

The standard technique involves placing a hidden <span> element at the very top of your email body. Email clients read this as the preview text, while it stays invisible to readers who open the email.

<body>
  <span style="display:none; max-height:0; overflow:hidden; mso-hide:all;">
    Your preview text goes here...
  </span>
  <!-- Rest of email -->
</body>

After the preview text, add invisible filler characters (like &zwnj;) to prevent the email client from pulling additional content into the preview.

Testing

Email Preview Testing: Why It Matters

Email preview testing ensures that your carefully crafted message looks and reads the way you intended — before it hits thousands of inboxes. A broken layout, missing images, or a truncated subject line can dramatically reduce open rates and damage brand trust.

Good email preview testing covers: HTML rendering across email clients, subject line display length, preview text truncation, mobile responsiveness, and image rendering with alt text fallback.

Optimization

Optimizing Your HTML Email Preview

An optimized HTML email preview combines three elements: a compelling subject line, well-crafted preview text, and a clean email design. Together, they form the first impression your subscriber receives.

Use our email preview tool to test all three simultaneously. Adjust your subject line for length, refine your preview text for engagement, and check that your HTML renders perfectly across all screen sizes.

FAQ

Frequently Asked Questions

Common questions about email preview, preview text, and testing your emails.

Email preview text is the short snippet of text that appears below or next to your subject line in most email clients (like Gmail, Outlook, and Apple Mail). It gives recipients a quick glimpse of your email's content before they open it, and is one of the most important — yet often overlooked — elements of email marketing.

The ideal email preview text length is between 85 and 140 characters. Most email clients display 40–140 characters depending on the device and screen size. Keep the most important content within the first 85 characters to ensure it's visible on all platforms, including mobile.

Add a hidden <span> element right after the opening <body> tag in your HTML email with your desired preview text. Style it with display:none; max-height:0; overflow:hidden; to hide it from the visible email. Most email clients will read this content as the preview text.

Yes! EmailPreview is completely free to use. Simply paste your HTML email code into our preview tool and instantly see how it renders. You can also switch between desktop, tablet, and mobile views to check responsiveness — all at no cost.

The subject line is the primary headline of your email, appearing in bold in most inbox views. Preview text (or preheader text) is the secondary snippet that follows the subject line in lighter text. Together, they form a two-part message designed to drive opens. The subject line gets attention; the preview text closes the deal.

If you haven't set an explicit preheader in your HTML, email clients will pull the first readable text from your email body — which could be navigation links, "View in browser" text, or other unintended content. Always set your preview text explicitly using a hidden preheader element for consistent results across all clients.

Our subject line preview simulator shows inbox rendering for Gmail, Outlook, Apple Mail, and iOS Mail — the four most widely used email clients that together represent the majority of global email opens. Our HTML preview renders in a sandboxed frame that closely approximates how modern email clients display HTML content.

Get Started

Ready to Send Better Emails?

Stop guessing how your emails look. Preview your HTML emails, optimize your preview text, and nail every subject line — completely free.

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