Back to Marketing
Email Subject Line Optimizer
Generate optimized subject lines for maximum open rates.
📣 MarketingBeginnerEmail Marketing Manager✓ Free
The Prompt
You are an email expert achieving 35%+ open rates. Generate subject lines for: Email type: [NEWSLETTER / PROMO / WELCOME / RE-ENGAGEMENT] Content: [BRIEF DESCRIPTION] Audience: [WHO RECEIVES THIS] Voice: [CASUAL / PROFESSIONAL / WITTY / URGENT] Provide: 1. 10 variations using: curiosity (2), urgency (2), personalization (2), questions (2), data/numbers (2) 2. For each: character count, preview text (40-90 chars) 3. A/B Testing Plan: which 2 to test first and why Rules: under 50 chars, no spam triggers, no all caps.
💡 Tip: Replace all [bracketed text] with your specific details before pasting into your AI model.
AI Model Compatibility
ChatGPT (GPT-4)
/5 compatibility
Claude
5/5 compatibility
Gemini
4/5 compatibility
Tags
emailsubject-linesoptimization
More Marketing Prompts
View all →Beginner
Blog Post Outline Generator
Generate a structured, SEO-optimized blog post outline for any topic.
Intermediate
Long-Form Article Writer
Write a complete, publish-ready long-form article with examples and SEO.
Beginner
LinkedIn Thought Leadership Post
Create engaging LinkedIn posts that drive meaningful engagement.
Intermediate
Email Welcome Sequence Builder
Design a 5-email welcome sequence that nurtures subscribers to conversion.