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Email Subject Line Checker
Score an email subject line for length, spam trigger words, ALL CAPS and punctuation, and preview it with preheader text in an inbox.
Tip from Tink: Around 30–50 characters shows fully on most phones.
Score
100/100
Characters
40
Words
7
- ✅ No problems found.
Phone inbox preview
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How to use the Email Subject Line Checker
- Type your subject and preheader.
- Fix any warnings shown.
- Check the inbox preview.
Everything runs in your browser. Nothing you enter is uploaded.