Free tool
Email Subject Line Tester
Check subject length, emoji count, and spam words.
Length checksSpam wordsInstant
Why it helps
Optimize subject lines
Stay within optimal length and reduce spam triggers.
Instant feedback
See word count, emoji count, and flags in real time.
Subject line tester
Quick checks
Length
0
Add a subject line
Words
0
Emojis
0
Spam word flags
No obvious spam words found.
FAQ
Quick answers about this tool.
Is this private?
Yes. All processing happens in your browser.
Do I need an account?
No. These tools are free and work without signup.
Can I use multiple files?
Yes. Most tools support batch processing.