Email Subject Line Tester
Enter a subject line to get its score, a spam-risk check, and practical suggestions for a higher open rate. Preview how it will look in the inbox before sending your next email.
0/200 characters. Ideal length: 30-50 characters.
0
Length
-Words
-Spam risk
-Feedback
Preview (this is how it will look in the inbox)
From: your-company@example.com
The first line of this email will appear here in the preview...
How to use
- Enter your subject line.
- Press Test — see the score, spam risk and feedback.
- Edit as per the tips and test again.
Good to know
- Subject lines of 30 to 50 characters read well on mobile screens.
- Questions and numbers tend to draw more attention.
- Avoid clickbait — it hurts trust and future open rates.
- Test two versions on small batches and compare the results.
This score is an estimate based on common email marketing best practices — your actual open rate depends on your audience.