Email Subject Line Tester
Inspect a subject locally with transparent counts, a small visible spam-word check, and a plain preview.
Email Subject Line Tester
Inspect a subject locally with transparent counts, a small visible spam-word check, and a plain preview.
Enter a subject line to inspect.
- Characters (UTF-16)
- 0
- Words
- 0
- Spam-word matches
- None found
Local editorial heuristic · This is not deliverability, inbox-placement, or statistically validated scoring.
A QUICK WALKTHROUGH
How to use this tool
- Enter a subject line.
- Review counts and visible word matches.
- Read the plain preview.
Transparent limits
The tester counts UTF-16 code units after trimming and whitespace-separated words, and performs case-insensitive substring checks against a small fixed list of English promotional terms. It does not predict delivery, inbox placement, or campaign performance.
GOOD TO KNOW
Common questions
Is this a deliverability score?
No. It is a local editorial aid, not a statistically validated or provider-specific score.