Email Preheader Generator
Generate engaging email preheader text that complements your subject line and gives readers more context before they open your email.
Adding your email content helps generate preheaders that match the actual message.
Visible preview length can vary by email client, device, screen width and inbox layout.
Need to improve your email first? Use our AI Email Rewriter.
Want to create an HTML email? Use our AI HTML Email Generator.
The subject and preheader should work together rather than repeating the same message.
No preheaders yet
Enter a subject line (and optionally email content), then click Generate Preheaders.
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What Is an Email Preheader?
An email preheader is the short preview text displayed next to or below an email subject line in many inboxes. It provides additional context about the email before the recipient opens it.
The preheader is sometimes also called preview text, a preview line, or an email snippet. It's one of the first things a reader sees when scanning their inbox, along with the sender name and the subject line.
What Is an Email Preheader Generator?
An email preheader generator is a tool that takes an email subject line (and ideally the email body) and produces multiple relevant preheader candidates. MailCannon's AI email preheader generator respects factual accuracy, produces complementary (not repetitive) text, and lets you control tone, style, length and language.
To use it: enter your subject and email content, pick your options, then click Generate Preheaders. The tool generates 5 suggestions at a time and you can keep generating more with the same settings.
Why Is Email Preheader Text Important?
Additional context
It lets you add information that doesn't fit naturally in the subject.
Inbox scanning
Readers scan sender + subject + preheader together when deciding what to open.
Mobile readability
On narrow screens, preheader text is often visible right below the subject.
Complements the subject
It lets the subject focus on the hook, and the preheader add value and detail.
Communicates purpose
It quickly explains what the email contains and why it matters.
This list explains why preheaders matter; MailCannon does not promise improved open rates.
How to Write a Good Email Preheader
- 1Complement the subject, don't repeat it.
- 2Avoid repetition between subject and preheader.
- 3Explain the benefit to the recipient.
- 4Keep it concise.
- 5Match the actual content of the email.
- 6Avoid misleading claims, urgency or clickbait.
- 7Consider mobile users and smaller screens.
- 8Match your brand voice and the email's tone.
Subject Line vs Email Preheader
| Dimension | Subject Line | Preheader |
|---|---|---|
| Role | The hook. It grabs attention in a few words. | The context. It adds value and explains what's inside. |
| Content focus | Promise, topic or question. | Benefit, next step, or supporting detail. |
| Length | Usually shorter. | Can be a little longer; visible characters vary by client. |
| Avoids | Spammy words and clickbait. | Simply restating the subject. |
| Example | Your order has shipped | Track your package and see expected delivery inside. |
Email Preheader Best Practices
Email Preheader Examples
| Use case | Subject | Good preheader | Why? |
|---|---|---|---|
| E-commerce | Your order has shipped | Track your package and see expected delivery inside. | Doesn't repeat the subject; adds context. |
| SaaS | New features are now available | Explore the latest improvements and how they can help you today. | Doesn't repeat the subject; adds context. |
| Newsletter | This week in MailCannon | 3 tips, a template pack and the latest product updates inside. | Doesn't repeat the subject; adds context. |
| Welcome email | Welcome to MailCannon | Set up your first campaign in 3 minutes with this quick-start guide. | Doesn't repeat the subject; adds context. |
| Promotional email | Save 20% this weekend | Use your discount before it expires — details and exclusions inside. | Doesn't repeat the subject; adds context. |
| Transactional email | Your receipt for #A-1234 | Attached is your receipt — summary and payment details inside. | Doesn't repeat the subject; adds context. |
| B2B email | Proposal for your review | Scope, pricing and next steps summarized for your team. | Doesn't repeat the subject; adds context. |
| Customer support | We've received your request | A member of the team will reply within 24 hours on weekdays. | Doesn't repeat the subject; adds context. |
Before you send, run the subject through our email subject line tester and verify recipients with the check-if-email-exists tool.
Frequently Asked Questions
What is an email preheader?▾
An email preheader is the short preview text displayed next to or below an email subject line in many inboxes. It gives additional context about the email before the recipient opens it.
What is email preview text?▾
Email preview text is another name for a preheader. It's the snippet of text shown in the inbox listing, usually after the subject line or sender name.
How does an email preheader generator work?▾
You enter a subject line (and ideally the email body), choose options like tone, style, length and language, then click Generate. The AI produces multiple preheader candidates that complement the subject and reflect the email's actual content.
How long should an email preheader be?▾
Visible preview length varies by email client, device, screen width and inbox layout. A standard target is around 40–90 characters, but short (up to ~50) or detailed (up to ~130) can also work depending on your goal. Avoid assuming a single universal character count.
Should the preheader repeat the subject line?▾
No — that wastes valuable preview space. A good preheader complements the subject by adding new detail, a benefit, a next step or more context.
Can I generate a preheader with AI?▾
Yes. MailCannon's AI preheader generator lets you generate 5 suggestions at a time based on your subject, body and options, and you can click Generate More for additional variants.
Should email preheaders include emojis?▾
We recommend being cautious. Emojis are fine in small doses (0–1) when they match your brand, but they can distract or hurt legibility in very narrow inboxes. The generator keeps them light by default.
Can I use a preheader for marketing emails?▾
Yes. Select Promotional tone/style and Email Marketing mode elsewhere, but keep all claims factual and non-misleading.
Can I use a preheader for transactional emails?▾
Absolutely. For transactional and lifecycle emails, the Informative style usually works well and focuses on next steps or relevant details.
What is the difference between a subject line and preheader?▾
The subject line is the headline that grabs attention. The preheader is the supporting preview text that adds context, value or a next step. They should work together rather than repeat each other.
Can I generate preheaders in French, Arabic or Spanish?▾
Yes. MailCannon's generator supports English, French, Arabic and Spanish, plus a 'Same as email' option when the subject/body already indicates the target language.
Is MailCannon's email preheader generator free?▾
The public tool on /tools/email-preheader-generator is available as a free utility. For higher-volume usage and dashboard features, log in and check your plan details.