Email Subject Line Generator
Generate high-open-rate email subject lines with proven psychological triggers, A/B test variants, and spam-score checks.
Your Email Subject Line Generator results will appear here
Como Usar Email Subject Line Generator
- Describe your email content or campaign topic in the text area — the more detail, the more relevant the subject lines.
- Specify your target audience so the AI can match tone and language to their expectations.
- Choose your primary goal: open rate focuses on curiosity and intrigue, clicks emphasizes value propositions, replies optimizes for conversational hooks.
- Select how many variations you want — 10 is ideal for A/B testing, 15 for large-scale multivariate tests.
- Review the output, pick your top 2 for an A/B test, and pair with the suggested preview text.
Casos de Uso
A/B test subject lines for weekly newsletter sends to boost open rates
Generate launch-day email subject lines for a new product or feature release
Re-engage dormant subscribers with curiosity-driven win-back subject lines
Create subject line swipe files for recurring campaign types (promos, digests, announcements)
Dicas para Melhores Resultados
- Include specifics about your offer — '30% off' generates better lines than 'a discount'.
- Mention your industry so the AI avoids spam-trigger words common in your vertical.
- Run the tool twice with different goals (open-rate vs. clicks) and mix the best from each batch.
- Always pair subject lines with the suggested preview text — it can lift open rates by 10-20%.
- Test emoji vs. no-emoji variants; emojis boost open rates in B2C but can hurt in B2B finance.
Perguntas Frequentes
How many subject lines should I generate?
Start with 10. Pick the top 2 for an A/B test, and keep the rest in a swipe file for future sends. If you run multivariate tests (Mailchimp, Klaviyo), go with 15.
Will these subject lines avoid spam filters?
Each line is scored for spam risk, and the tool flags trigger words. However, deliverability also depends on your sender reputation, list hygiene, and ESP. Always run a test send.
What's the ideal subject line length?
Under 50 characters for maximum mobile visibility. The tool shows character counts for every line so you can prioritize short options.
Can I use these for cold outreach?
Yes — select 'Get Replies' as your goal and the AI will favor conversational, low-hype subject lines that perform better in cold email.
How do preview texts work?
Preview text (preheader) appears after the subject line in most email clients. The tool generates complementary preview text that extends the hook without repeating the subject, boosting open rates.
Are emojis included?
The AI uses emojis strategically where data shows they improve opens. Each variation is labeled with the technique used, so you can easily filter emoji vs. plain-text lines.
Não armazenamos o seu texto. O processamento acontece em tempo real e a sua entrada é descartada imediatamente após gerar o resultado.
Desbloquear Acesso Ilimitado
Utilizadores gratuitos: 5 utilizações por dia | Utilizadores Pro: Ilimitado
This tool is a step in the following agent workflows:
See how this tool stacks up side-by-side:
✍️ 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.