Free Tool
Email Subject Line Tester
Score your subject lines before you send. Optimize for higher open rates.
Enter Your Subject Line
Type or paste your email subject line to analyze
0 characters
Try an example:
Email Subject Line Best Practices
Do:
- • Keep it 30-50 characters
- • Use numbers for specificity
- • Add emojis sparingly
- • Personalize when possible
- • Create urgency (honestly)
- • A/B test your subject lines
Don't:
- • Use ALL CAPS
- • Use multiple exclamation marks!!!
- • Use spam trigger words
- • Be misleading or clickbaity
- • Make it too long (60+ chars)
- • Forget mobile users
About This Tool
Test your email subject lines before you hit send. Paste in a subject line and get a score based on length, power words, personalization, and spam trigger avoidance. Helps you pick the version most likely to get opened.
How to Use
- 1Type or paste your email subject line
- 2Review the score and specific feedback
- 3Try different variations to improve the score
- 4Pick the highest-scoring option for your campaign
Why Use This?
Your email is worthless if nobody opens it. Subject lines make or break open rates, and most people just wing it. A quick score check takes 10 seconds and could double your opens.