Email Subject Line Tester
Create compelling subject lines that boost open rates
Analysis Results
Email Preview
Mobile View
From: Your Name
Subject line preview...
Email body preview text...
Length Check
Character Count
0 characters
Spam Check
Spam Triggers
No spam words detected
Personalization
Personal Elements
No personalization detected
Suggestions
Benefits & Features
Our subject line tester helps you create better email campaigns:
Spam Prevention
- Spam word detection
- Trigger phrase alerts
- Character limit checks
- Symbol usage warnings
- Case sensitivity tips
Preview Testing
- Mobile preview
- Desktop preview
- Client-specific tips
- Length optimization
- Visual feedback
Engagement Tips
- Personalization ideas
- A/B test suggestions
- Best practices
- Open rate insights
- Industry standards
Frequently Asked Questions
What makes a good email subject line?
An effective email subject line should:
- Be concise (30-50 characters)
- Create urgency or curiosity
- Avoid spam trigger words
- Include personalization when possible
- Match the email content
What are common spam trigger words to avoid?
Common spam trigger words include:
- Financial terms: "Cash", "Money back", "100% free"
- Urgency terms: "Act now", "Limited time", "Once in a lifetime"
- Marketing terms: "As seen on", "Best price", "Guarantee"
- Symbols: Excessive punctuation (!!!, ???), dollar signs ($$)
- ALL CAPS or excessive emojis
How can I improve my open rates?
To improve email open rates:
- Use personalization (recipient's name or company)
- Test different times and days for sending
- Segment your email list for targeted content
- A/B test different subject lines
- Keep your email list clean and updated
Why is mobile preview important?
Mobile preview is crucial because:
- Over 60% of emails are opened on mobile devices
- Mobile displays show fewer characters (30-40)
- Different devices truncate subject lines differently
- Mobile users make quick decisions to open/delete
- Poor mobile display can hurt engagement rates