AI Email Subject Line Generator

Write email subject lines that get opened — proven formulas with AI

Email Topic / Content*

Email Type

Subject Line Style

About This Tool

The subject line is the most important part of any email — it determines whether your email gets opened or ignored. Our AI Email Subject Line Generator creates multiple subject line options using proven formulas (curiosity, urgency, benefit-driven, personalization) tailored to your email type and audience.

How to Use the AI Email Subject Line Generator

1Describe your email's topic or content
2Select the email type
3Choose a subject line style
4Generate 10 options
5A/B test 2–3 of the strongest ones

Frequently Asked Questions

What is a good email open rate?

Average open rates vary by industry: B2B newsletters average 20–25%, promotional emails 15–20%, cold outreach 30–50% (when well-targeted). A subject line alone can double or halve these numbers.

How long should an email subject line be?

Keep subject lines under 50 characters to avoid truncation on mobile. 30–40 characters is ideal. The most important words should be in the first 30 characters.

Do emojis in subject lines increase open rates?

Often yes — emojis can increase open rates by 15–25% when used sparingly and relevantly. Avoid overuse or irrelevant emojis, which can trigger spam filters or feel unprofessional.

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