Email Marketing

Email Subject Line Generator

Describe your email topic, audience, and goal. Get 20 subject lines with A/B test pairs, psychological triggers, and spam-check tips.

By The Prompt Black Magic Team

Share what the email is about and who it is for. Pick the best subject lines from the generated options.

Generate high-performing email subject lines for the following campaign.

Email topic: [WHAT THE EMAIL IS ABOUT]
Audience: [WHO RECEIVES THIS EMAIL]
Goal: [OPEN THE EMAIL / CLICK A LINK / MAKE A PURCHASE / REGISTER FOR EVENT]
Brand tone: [PROFESSIONAL / PLAYFUL / URGENT / CONVERSATIONAL]

Generate 20 subject lines organized by strategy:

1. Curiosity gap (5 options): Make them need to know what is inside
2. Benefit-driven (5 options): Lead with what they get
3. Urgency and scarcity (5 options): Create time pressure without being spammy
4. Personalization (5 options): Use [FIRST_NAME] or segment-specific language

For each subject line:
- Keep under 50 characters (mobile-friendly)
- Rate it: expected open rate impact (high / medium / low)
- Flag any spam trigger words to avoid
- Suggest a matching preview text (the snippet after the subject)

Also:
- Pair your top 3 as A/B tests (version A vs. version B)
- Explain what makes the #1 pick your strongest recommendation
- List 10 words and phrases that trigger spam filters so I can avoid them in future