Email Subject Line Checker
Analyze your subject line for length, spam trigger words, and preview how it appears on mobile devices.
0 characters
0 characters
Try examples:
straightenLength Analysis
Character count0 / 50 ideal
Word count0 words
previewPreheader Analysis
Character count0 / 40-100 ideal
Tip: Preheader text appears after your subject line in the inbox. Use it to add context and encourage opens.
shieldSpam Check
Enter a subject line to check for spam trigger words.
lightbulbBest Practices
- checkKeep it under 50 characters for best mobile display
- checkPut important words at the beginning
- checkAvoid ALL CAPS and excessive punctuation!!!
- checkPersonalize when possible (name, location)
- checkCreate urgency without being spammy
smartphoneMobile Preview
See how your subject line appears in mobile email clients.
phone_iphoneiPhone (375px)
9:41 AM
Your Company
Your subject line preview...
Preview text appears here...
Yesterday
Newsletter
Weekly update: New features...
Check out what's new this week...
androidAndroid (360px)
9:41
Your Company
Your subject line preview...
Preview text appears here...
computerDesktop
Y
Your Company9:41 AM
Your subject line preview...
Preview text appears here...