✉️ Free Tool
Email Subject Line Generator
Generate high-converting subject lines that get your emails opened. Based on proven formulas used by top marketers.
How to Write Email Subject Lines That Get Opened
Your subject line is the most important part of your email. It determines whether someone opens your message or ignores it. The average office worker receives 121 emails per day — your subject line needs to stand out.
Best Practices for Email Subject Lines
- Keep it short: 40-50 characters is optimal. Mobile devices truncate longer lines.
- Create urgency: Time-sensitive language drives action, but don't fake it.
- Personalize when possible: Including the recipient's name can boost open rates by 26%.
- A/B test everything: Small changes can make big differences. Test 2-3 variations per campaign.
- Avoid spam triggers: Words like "FREE!!!" or excessive caps land you in spam folders.
Subject Line Formulas That Work
The best subject lines follow proven formulas. Curiosity gaps make readers want to learn more. Benefit-focused lines promise value. Questions engage the reader directly. Use this generator to apply these formulas to your specific emails.
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