Email Subject Line Tester
Score your subject before you hit send
Runs in your browser Instant results 100% free
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About the Email Subject Line Tester
The subject line decides whether your email is opened, ignored or sent to spam. This tester scores your subject from 0 to 100, flags spam trigger words and shouting in capitals, and shows how it looks in a mobile and desktop inbox together with your preview text.
How to use it
- Type your subject line and preview text.
- Read the score and the list of what is good and what to fix.
- Try a few versions and keep the one with the best score.
Frequently asked questions
What is the best subject line length?
Around 30–50 characters or 6–10 words. Mobile inboxes show only about 35–40 characters.
Do emojis help open rates?
One relevant emoji can help stand out. More than one often looks spammy.
Want to master this skill?Learn it step by step in our Email Marketing course – practical, in Hindi and English.
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