Keep it under 50 characters
Most email clients show 40-60 characters. Short subject lines perform better on mobile where screen space is limited.
Free Tool
Free Email Subject Line Tester
Get an instant score and actionable tips to write subject lines that get opened.
0/60 characters
Tips for better subject lines
Ask a question
Questions create curiosity and compel readers to open for the answer. 'Are you making this email mistake?' outperforms 'Common email mistakes'.
Use numbers
Specific numbers build credibility. '5 ways to grow your list' is more compelling than 'Ways to grow your list'.
Avoid spam trigger words
Words like FREE, WINNER, ACT NOW trigger spam filters and erode trust. Be direct and genuine instead.
Ready to send better emails?
Pigeon makes it easy to write, send, and track email campaigns - free up to 500 subscribers.