Email Subject Line Prompts for Better Open Rates

Your email subject line is your first impression—and often your only chance to grab attention in a crowded inbox.

If your open rates are low, it’s not your content—it’s your subject lines.

In this guide, we’ll give you 50+ powerful ChatGPT prompts to generate high-converting email subject lines, with examples, tips, and strategies to increase open rates in 2025 and beyond.

📊 Why Subject Lines Matter in Email Marketing

  • 🔍 47% of recipients open an email based on the subject line alone
  • ❌ 69% report emails as spam based on subject lines
  • 💰 Great subject lines = higher open rates = more sales

Let’s fix yours.

🤖 How ChatGPT Helps You Write Better Subject Lines

ChatGPT can:

  • Generate multiple variations for A/B testing
  • Match tone, urgency, or emotion to your audience
  • Add personalization or emoji elements
  • Rewrite subject lines for different campaigns or buyer stages

🧠 A. General Email Subject Line Prompts

  1. Write 10 subject lines for a [product/service] launch.
  2. Give me short and punchy subject lines about [Topic].
  3. Create curiosity-based email subject lines for [Offer].
  4. Write email subject lines using power words about [Benefit].
  5. Write 5 email subjects under 50 characters.
  6. Generate subject lines that spark FOMO about [Product/Event].
  7. Write subject lines with a sense of urgency for [Sale/Event].
  8. Create subject lines for a weekly newsletter in [Niche].
  9. Generate personalized subject lines for [Audience Type].
  10. Write subject lines using questions to grab attention.

💼 B. Sales & Promotions Email Prompts

  1. Write subject lines for a limited-time offer ending tonight.
  2. Generate subject lines for a product discount announcement.
  3. Create email subjects for a flash sale in [Niche].
  4. Write 3 variations of a subject line for a BOGO deal.
  5. Make subject lines that tease a mystery discount.
  6. Write 5 urgency-driven subject lines for cart abandonment emails.
  7. Generate holiday-themed subject lines for Black Friday.
  8. Write subject lines for a back-in-stock notification.
  9. Create FOMO subject lines for early access deals.
  10. Generate subject lines for seasonal clearance sales.

🎯 C. Lead Nurturing & Relationship Building Prompts

  1. Write friendly and conversational subject lines for new subscribers.
  2. Create subject lines for a welcome email series.
  3. Write subject lines for an educational email sequence.
  4. Generate subject lines for a success story or case study.
  5. Write 3 subject lines for a “we miss you” re-engagement email.
  6. Create subject lines for milestone emails (anniversaries, birthdays).
  7. Make subject lines that sound like a personal check-in.
  8. Write subject lines asking for feedback or a quick reply.
  9. Create subject lines for introducing your team or brand story.
  10. Generate subject lines that invite subscribers to an event or webinar.

🎁 D. Content & Value-Focused Subject Line Prompts

  1. Write subject lines for a free guide or download.
  2. Create subject lines for weekly blog updates.
  3. Generate subject lines that promise a how-to lesson.
  4. Write subject lines teasing a new YouTube video.
  5. Make subject lines for a podcast episode drop.
  6. Create subject lines that share 3 surprising tips on [Topic].
  7. Generate subject lines for a roundup email of resources.
  8. Write subject lines for a “myths vs facts” educational email.
  9. Create subject lines that promise quick wins.
  10. Generate subject lines with a cliffhanger or teaser.

🧪 E. A/B Testing & Optimization Prompts

  1. Write two versions of this subject line: “[Insert Line]”.
  2. Rewrite this subject to add urgency and scarcity.
  3. Make this subject line more casual and fun.
  4. Make this subject line more formal and authoritative.
  5. Add an emoji to this subject line and test 3 options.
  6. Write this subject for mobile-first users.
  7. Create a clickbait version and a clean version of this subject.
  8. Improve this open rate: “[Subject Line]” (currently 12%).
  9. Turn this subject line into a question.
  10. Write subject lines for different buyer personas (new vs. loyal customers).

💌 Bonus Prompt

  1. Generate 5 high-converting subject lines based on this landing page copy.

📈 Tips to Boost Email Open Rates

  • ✅ Keep it under 60 characters
  • ✅ Use numbers or lists
  • ✅ Create urgency but avoid spammy words
  • ✅ Personalize with first names or locations
  • ✅ A/B test regularly

✨ Example Subject Lines Generated with Prompts

Campaign TypeSubject Line Example
Flash Sale“⏰ Ends Tonight: 25% Off Everything”
Welcome Email“You’re In! Here’s What to Expect 🎉”
Blog Update“5 Game-Changing Tips You Missed This Week”
Product Launch“Meet Your New Favorite Tool 🛠️”
Event Invite“Join Us LIVE This Thursday!”

🔗 Related Resources