Step 1
Enter your subject line
Type the subject line you plan to use in your campaign and click Test
Email Subject Line Tester: Optimize for Clicks & Conversions
Increase your open rates: create catchy subject lines before sending a campaign with our free email subject line tester.
Try email subject line tester for free 👇
Overall score
Ready
Run a test to see the analysis.
What to improve
Breakdown
Suggestions
Free Email Subject Line Tester by Selzy
Before your email gets opened, it has just one job: the subject line.
This tool helps you make it work.
Learn how to use it in 3 simple steps 👇
Step 2
Get instant analysis
The AI tool checks length, trigger words, readability, and open-rate potential.
Step 3
Improve and send
Apply the recommendations to improve your subject line and launch a more effective campaign.
How Email Subject Line Tester Improves Your Open Rates?
Choosing the right words
Even the wrong sentiment can affect your open rates.
Spam and Deliverability Check
The tool replaces spam words with synonyms to help your email avoid the spam folder. It also checks for typos, extra spaces, repeated words, sentences that start with a lowercase letter — errors that often go unnoticed when writing emails.
Suggests the ideal length
According to the GetResponse report, subject lines that have 61 to 70 characters yield the highest open rates of 43.4%. If yours is shorter or longer, AI will suggest a better version.
Using Emojis
32.4% of email campaigns sent via Selzy had 2 or more emojis in subject lines. But the key is not to overdo it and not replace the words with them. Our tool scans the subject line to check if it’s appropriate to use.
Frequently Asked Questions
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What is an Email Subject Line Tester?
It is a tool for email marketers that helps to improve subject lines and, therefore, to increase open rates.
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How Does the Tool Analyze My Subject Line?
The email subject line is analyzed by AI. It takes into account the number of words, checks for grammatical errors, adds or deletes emojis, and suggests improvements.
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Is It Free to Use?
Yes, the Email Subject Line Tester is completely free to use.
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How Accurate Are the Suggestions?
AI is a powerful tool that analyzes your subject line by different criteria. But it is not perfect and can make mistakes. Don’t hesitate to let us know if you find an error.
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Does the Tool Store or Use My Data?
No, it doesn’t store your data. You can be sure that the information you paste won’t be used anywhere.
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Can I Use This for A/B Testing?
Sure! You can test your subject line and the one suggested by our tool and see what works better.
Generate subject lines that stand out in inboxes and get clicks
Use this free email subject line tester —
bundle it with Selzy’s email marketing automation tool to run your campaigns on autopilot.