Free subject line generator for cold email
Add the prospect's company, the problem you solve and the result you deliver. You get personalised subject lines in five styles, with character counts and a phone cut-off warning.
How the subject line generator works
The generator fills proven subject line patterns with your details: questions, personal lines, outcomes, referrals, triggers and follow ups. It runs in your browser, with no AI and no data sent anywhere.
Each line shows its length. Lines over about 45 characters are flagged because phones may cut them off.
Then test the best ones
Pick two or three and score them with the subject line tester, check your copy with the email spam checker, and see 40 more in cold email subject lines.
What makes a subject line work
- Short enough to show in full on a phone.
- About the reader, not about you.
- Plain, like a note from a colleague.
- No fake "Re:" on a first email, no all caps, no stacks of exclamation marks.
Subject line generator questions
How does the subject line generator work?
It combines your inputs with common cold email subject line patterns and shows each result with its character count.
Is it free?
Yes, free with no sign-up. It runs in your browser.
How long should a cold email subject line be?
Short enough to show in full on a phone. The tool flags lines over about 45 characters.
Should I A/B test subject lines?
Yes. Test two at a time on similar audiences and keep the winner.
Your subject earns the reply. Revbound answers it.
Revbound labels every reply and answers interested leads with free times from your calendar.