✉ Marketing Tool

Email Subject Line Tester

Score your email subject lines for open rates, spam risk, and emotional impact. Get actionable tips to improve click-through rates.

Test Your Subject Line

Email Subject Line

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Email Subject Line Best Practices

Optimal Length

Keep subject lines between 30-50 characters (6-10 words) for the best open rates. Mobile email clients show fewer characters, so front-load your most important words.

What Makes a Good Subject Line

Personalization — Use the recipient's name or company when possible
Urgency — Create time-sensitivity without being spammy
Curiosity — Tease content without giving everything away
Value — Clearly state what the reader will gain
Numbers — Specific numbers increase open rates by up to 45%
Questions — Questions engage readers and invite them to find the answer

Spam Trigger Words to Avoid

Words like "FREE!!!", "Act Now", "Limited Time", excessive punctuation (!!!), and ALL CAPS can trigger spam filters and reduce deliverability.