Email subject line tester
Paste a subject line and preview text to see a live inbox preview and quick checks for length, spam trigger words, caps, and emoji.
100
Strongsubject line
7 of 7 checks pass
34 chars · 6 words
51 chars
Inbox preview
Checks
Subject length
34 characters. In the 30 to 50 sweet spot.
Preview text
51 characters. Well sized.
Spam trigger words
None found.
All-caps words
None. Sentence case reads as more personal.
Punctuation
Restrained.
Emoji
None. Optional, one well-placed emoji can lift opens.
Personalization
No merge tags. Personalized subjects often lift opens; try a first name or company.