Free tool · No sign-up
Email Subject Line Generator
Your subject line is the reason an email gets opened or ignored. Describe your newsletter or email and get 10 subject lines, each with matching preview text.
Tips for better results
- Keep subject lines around 30-50 characters for mobile inboxes.
- Use the preview text to add a second hook, not repeat the subject.
- Avoid spam triggers like ALL CAPS and excessive punctuation.
📧 Go further: Newsletter Writer
Write the full newsletter, preview text, an A/B subject and a send-time recommendation. Your AI team works in 3 steps:
- Find the Hook - AI Planner finds the perfect angle
- Write Newsletter - AI Writer creates the full newsletter
- Optimize & Preview - AI Editor optimizes for engagement
Frequently asked questions
How long should an email subject line be?
Roughly 30-50 characters works well, since most opens happen on mobile where long subjects get cut off.
What is preview text?
The short line shown after the subject in most inboxes. Treat it as a second chance to earn the open.
Is it free?
Yes. A free account also writes the full newsletter.