Free AI Tool

AI Email Subject Line Generator

Paste your email, pick a tone, and get 5 high-converting subject line options instantly.

3/3 free generations  ·  Login for 20/day
Professional
Urgent
Friendly
Formal
Playful
Casual
Generate Subject Lines
0 / 3000 characters
The more complete your email, the more accurate the subject lines will be.
Your Subject Lines

Keep It Short

Aim for under 60 characters. Most email clients truncate longer subject lines, especially on mobile.

Match the Tone

A mismatch between subject line tone and email content reduces trust and open rates.

A/B Test

Use 2 of the generated options to A/B test. Even small wording changes can lift open rates by 10-30%.

Avoid Spam Triggers

Words like "FREE!!!", excessive caps, and multiple exclamation marks send emails to spam folders.