Email Subject Generator
Write high-open-rate email subject lines from your topic, audience and goal using proven copy formulas.
Email Subject Generator is a Email & Marketing tool that write high-open-rate email subject lines from your topic, audience and goal using proven copy formulas. It's best for produce several A/B-test subject lines for a product-launch announcement email.
Need unlimited uses?
Upgrade to Pro — $19/moYour Email Subject Generator results will appear here
Expect copy that's ready to send — subject line options, body, CTA, and tone variations.
How to Use Email Subject Generator
- Enter product/topic in the main input field. Be as specific as possible for better results.
- Configure your preferences: Tone.
- Click 'Generate' and wait a few seconds for the AI to process your request.
- Review the generated output. Use 'Regenerate' for a different variation or 'Copy' to use the result.
- Refine your input or adjust settings and regenerate until you're satisfied with the result.
Use Cases
Produce several A/B-test subject lines for a product-launch announcement email.
Refresh a newsletter's open rate by generating new angles for a recurring edition.
Write urgency-driven subject lines for a limited-time sale or webinar reminder.
Generate matching subject and preview text for a cold or re-engagement campaign.
Quickly create subject variants when an initial send underperformed.
Tips for Best Results
- Be specific in your input — detailed descriptions produce better results.
- Try generating multiple times with different settings for varied outputs.
- Review and customize the AI output before using it in production.
- Include your unique selling points and target audience for more persuasive copy.
Frequently Asked Questions
What do I enter to get good subject lines?
Describe the email's main topic, who it's going to, and the action you want (open, click, reply). Mentioning any offer, deadline, or hook helps the tool tailor the angles.
What styles of subject line does it generate?
It mixes approaches such as curiosity gaps, urgency and scarcity, benefit-driven statements, questions, and personalised angles, so you get a range rather than variations of one idea.
Will these guarantee a higher open rate?
No tool can guarantee opens; results depend on your list, sender reputation, and timing. The value is generating several testable angles quickly so you can A/B test and learn what your audience responds to.
How long should an email subject line be?
Aim for roughly 30-50 characters so it isn't truncated on mobile inboxes. The tool favours concise lines, but always preview how they render in Gmail and Apple Mail.
Does it consider spam-trigger words?
It leans toward natural, benefit-led phrasing rather than spammy ALL-CAPS or excessive punctuation, which helps deliverability. Still, review lines against your ESP's spam checker before sending.
Can it write the preview text too?
Yes. You can ask for matching preview (preheader) text that complements the subject line instead of repeating it, which together improve the open-rate signal in the inbox.
How many subject lines should I A/B test?
Testing two to three strong, genuinely different angles per send is practical. Generate a batch, pick the most distinct contenders, and let your ESP split-test them on a sample.
Is there a usage limit?
Free use covers 5 generations per day with no signup; each run returns multiple lines. Pro at $19/month gives unlimited generations for high-volume campaign work.
We don't store your text. Processing happens in real-time and your input is discarded immediately after generating the result.
Unlock Unlimited Access
Free users: 5 uses per day | Pro users: Unlimited
This article contains affiliate links. If you purchase through these links, we may earn a small commission at no extra cost to you.
Jasper
AI writing assistant for content creators, marketers, and businesses.
✍️ Prompt Library
Ready-to-use prompts — click "Use This" to auto-fill the tool
Write a cold outreach email to a [role] at a [company type] offering [value proposition]. Keep it under 100 words.
Create 5 subject line variants for a promotional email about [offer]. A/B test friendly.
Write a welcome email for new subscribers to a newsletter about [topic].
Draft a follow-up email 3 days after a sales demo for [product].
Write a re-engagement email for subscribers who haven't opened in 90 days.
