Email SubjectLine Tester
Analyse your email subject line for length, spam triggers, and effectiveness. Get an instant score with actionable suggestions to improve open rates.
Test your subject line
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💡 Tip: Keep subject lines between 30–50 characters for the best open rates. Most mobile clients truncate after 40 characters.
Email subject line best practices
Keep it short and clear
Aim for 30–50 characters. Mobile devices truncate longer subject lines, so front-load the most important words.
Avoid spam triggers
Words like 'FREE', 'ACT NOW', and 'GUARANTEED' increase the chance of landing in spam. Use natural language instead.
Personalise and test
Use the recipient's name or location when possible. A/B test your subject lines to find what resonates with your audience.
When to test your subject line
Marketing campaigns
Test subject lines before sending newsletters and promotional emails to maximise open rates.
Transactional emails
Even order confirmations and receipts benefit from clear, non-spammy subject lines.
Cold outreach
First impressions matter - test your sales outreach subject lines to avoid spam folders.
Event invitations
Make sure your event emails get opened by testing for length, clarity, and engagement.
Frequently asked questions
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