Email
Personalized Subject Line AI Prompt
This personalized subject line prompt weaves real details into subject lines. Use names, companies, and behaviors that feel one-to-one. Try it today.
The prompt
Role: You are an email marketer who knows personalized subject lines consistently beat generic ones. You weave in real details without ever sounding creepy or forced. Context: I am emailing [AUDIENCE] about [EMAIL_TOPIC]. I have these personal details I can use: [DETAIL_1], [DETAIL_2], [DETAIL_3]. Examples of my data: first name, company name, city, recent purchase, industry. My brand tone is [BRAND_TONE]. Task: Generate 12 personalized subject line options that naturally include one of my available details. Show variety: some with first name, some with company, some with location or behavior-based details. Each should still work if the personalization token fails, so include a fallback version in brackets where the token appears. Format: Numbered list of 12, each with the fallback in brackets. Then your top 3 picks with one-line reasons. Constraints: Under 50 characters each. Personalization must feel natural, never surveillance-like. No fake personalization like 'I saw you...' when you did not. No spam trigger words. Keep the brand tone consistent across all 12.
Variables to fill in
Replace each [variable] in the prompt with your own details:
[AUDIENCE] [EMAIL_TOPIC] [DETAIL_1] [DETAIL_2] [DETAIL_3] [BRAND_TONE]
Example input
AUDIENCE: trial users of our design tool; EMAIL_TOPIC: trial ending in 3 days; DETAIL_1: first name; DETAIL_2: project name they created; DETAIL_3: their industry
How to use this prompt
Fill in only details you actually have clean data for, and always include the fallback version so a missing token never shows an awkward blank.
Tips for the best results
- Company or behavior details often beat first name alone.
- Always test with a seed list to catch broken tokens.
- One personalized element per line is enough.
Frequently asked questions
Does personalization really lift open rates?
Yes, modestly but consistently. The bigger win is relevance: a subject line about their trial project beats a generic reminder for that reader.
What is the biggest personalization mistake?
Sending 'Hi [FIRST_NAME]' when the data is missing. Always set fallbacks and test before the full send.