Email Subject Generator
Generate high-open-rate email subject lines for any topic.
Email topic
Email subject line best practices
The subject line has one job: get the email opened. Average open rates are 20–40%. A better subject can double opens on an otherwise identical email.
- Under 50 characters (truncated on mobile)
- Personalisation lifts opens 10–30%
- A/B test with 1,000+ sends per variant
- Match subject to content — avoid clickbait
Formula / How it works
25 proven subject line formulas combined with power words and triggers. Keep subjects under 50 characters. A/B test 2 versions for best results.