Writing & Content · Free tool
Email Subject Line Analyzer
Length, preview cutoff, spam-word flags, and all-caps % for any subject — before you hit send.
Updated April 2026
Characters
44
Words
6
All-caps %
15%
Sentiment
Neutral
Inbox preview cutoffs
Mobile (40):Don’t miss our FREE winner giveawa…
Gmail (50):Don’t miss our FREE winner giveaway!!!
Desktop (60):Don’t miss our FREE winner giveaway!!!
Spam-word matches
free, winner, !!!
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What it does
Score subject lines on length, spam risk, and caps before you send.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Paste the subject.
- Read the score and flags.
- Tweak until clean.
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