Free Email Subject Line Tester
Is your important email getting lost in a crowded inbox? The subject line is your one and only chance to make a first impression. Use our free tester to score your subject line and get instant feedback to help you increase open rates.
3 Tips for Writing Subject Lines That Get Opened
Keep It Short & Clear: Over 50% of emails are opened on mobile devices. Aim for a length between 30-50 characters to ensure your full message is visible.
Create Urgency or Curiosity: Use numbers, ask a question, or hint at a valuable piece of information inside. A subject like “Your weekly report” is boring, but “A question about your weekly report” creates curiosity.
Avoid “Spammy” Language: Words like “Free,” “Urgent,” “Buy Now,” or using ALL CAPS can trigger spam filters and cause your email to land in the junk folder before it’s ever seen.
How Our Subject Line Tester Works
Our tool analyzes your subject line based on several key data points that are known to influence open rates. It’s not powered by AI, but by a set of proven rules:
Length Analysis: It checks if your subject line is within the optimal character count.
Word Choice: It scans for words that are known to trigger spam filters and, conversely, for “power words” that can increase engagement.
Use of Numbers: It rewards subject lines that use numbers, as they tend to make headlines more specific and credible.
Frequently Asked Questions (FAQ)
Is this tool 100% accurate?
Our tester provides a score based on industry best practices. While a high score is a strong indicator of a good subject line, other factors like your sender reputation and email content also play a crucial role.
Is my data saved?
No. All analysis happens directly in your browser. We do not see, save, or store any of the subject lines you enter.