Email Subject Line Generator
Generate five clear, compelling email subject lines tailored to your topic, audience, angle, and campaign context.
Customise & copy
Add the context you have. The prompt updates as you work.
State the main subject of the email.
Identify who will receive the email.
Describe the specific perspective or takeaway to emphasize.
Provide factual context about the email campaign and timing.
Live prompt
4 fieldsGenerate exactly 5 email subject lines for the topic quarterly product analytics updates, intended for B2B marketing managers, using the key angle three practical changes to improve reporting and fitting this campaign context: A product update email scheduled for this week's customer newsletter.. Make each subject line concise, clear, and compelling for quick opens without fake urgency, false deadlines, scarcity claims, ALL CAPS, or excessive punctuation. Reflect the topic and angle accurately. Return only the 5 subject lines, one per line, with no numbering, bullets, commentary, or follow-up questions.
Proof before you use it
A real example
Tested on gpt-5.6-luna on 2026-09-10
{
"topic": "new hospital data privacy requirements",
"audience": "hospital compliance officers",
"key_angle": "the operational steps teams should review this quarter",
"campaign_context": "An internal compliance briefing prepared for department leaders before a policy review meeting."
}A small ritual that works
How to use it
- 01Enter the main email topic.
- 02Specify the intended audience.
- 03Describe the key angle or takeaway.
- 04Add factual campaign context, including relevant timing.
Why it works
The prompt gives the task a clear scope: five subject lines for one defined topic, audience, angle, and campaign context. It also separates content requirements from style constraints, directing the writer to stay concise, accurate, and suitable for quick scanning while avoiding misleading urgency, scarcity language, all caps, and excessive punctuation. The required one-line format reduces ambiguity about how the subject lines should be presented.
Where it fails
The prompt provides no method for resolving conflicts between the topic, key angle, and campaign context when those inputs point in different directions. It also leaves terms such as "concise," "clear," and "compelling" open to interpretation, so the resulting subject lines may differ in length, tone, or emphasis depending on the supplied inputs.
Customisation tips
Use the topic field for the email's central subject, the audience field for the recipient group, and the key_angle field for the specific takeaway or perspective to emphasize. Make campaign_context factual and concrete, especially when timing, product stage, or newsletter placement should influence the wording. If you want a particular brand voice, add that preference to the prompt while preserving the existing restrictions on misleading urgency, false deadlines, scarcity claims, all caps, and excessive punctuation. You can also define a preferred character limit or words to avoid if consistency across campaigns matters.
Watch-outs
- Broad audience descriptions can make the intended vocabulary and level of detail unclear.
- A key angle with several competing takeaways may weaken the single focus of each subject line.
- Campaign context describes the surrounding situation, but the prompt does not specify how strongly that context should appear in the wording.
- The instruction to return only five lines leaves no room for explanations, labels, or notes about how the inputs were interpreted.
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