FREE EMAIL TOOL · SCORE + INBOX PREVIEW
Email Subject Line Tester – Free Score and Inbox Preview
Type your email subject line and preview text. Get a score out of 100, see how it looks in a phone and desktop inbox, and get quick fixes for length, spam words, emojis and personalisation.
Phone inbox
D
Sender
Subject
Preview text
Desktop inbox (Gmail)
SenderSubject – Preview text
Subject line score
–/100
Type a subject line
Subject Line Examples: Weak vs Better
Good subject lines are short, specific and honest about what is inside.
| Weak | Better | Why |
|---|---|---|
| Newsletter – October | 3 SEO fixes you can do this weekend | Specific benefit with a number |
| HUGE SALE!!! 50% OFF | Priya, your course discount ends Friday | Personal and clear, no shouting |
| Important update | Your Saturday class moves to 11 am | Says exactly what changed |
| Re: our conversation | The Google Ads checklist you asked for | Honest, no fake reply |
| Check this out 😍🔥🎉 | New batch starts 5 Nov 🎓 | One emoji that adds meaning |
Tips for Higher Open Rates
Front-load the hook
Phones show about 35–40 characters. Put the most important words first.
Always set preview text
It is the second line people see. Use it to add a reason to open, not to repeat the subject.
Check the whole email
Scan the message body too with our spam words checker.
A/B test
Send two subject lines to small parts of your list and use the winner for the rest.
Use a real sender name
"Priya from Digital Vishnu" often gets more opens than "noreply".
Score your headlines too
Blog titles follow similar rules. Try our headline analyzer.
Write Emails People Open
Subject lines win the open; good emails win the sale. Learn email marketing, automation and copywriting hands-on in our classes in Coimbatore.
Frequently Asked Questions
What is a good email subject line length?
About 25 to 50 characters, or 4 to 9 words. Phones show only around 35 to 40 characters, so put the key words first.
Should I use emojis in subject lines?
One relevant emoji can help it stand out. More than one often looks like spam and may not display well everywhere.
What is email preview text?
The short line shown after the subject in most inboxes. If you do not set it, the inbox shows the first words of your email instead.
Do personalised subject lines work?
Often, yes. Adding the reader's first name or speaking directly with "you" usually feels more relevant. Make sure your list has the names first.
Does this tool send any email?
No. It only checks the text you type, in your browser. Nothing is sent or stored on our server.
Is this email subject line tester free?
Yes. It is free and needs no login.
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