The subject line is the first impression your email makes — and it could be the last if it doesn’t grab attention. Whether you’re sending a newsletter, a promo, or a personal note to your subscribers, your subject line needs to spark curiosity, deliver value, or create urgency.
Here’s how to write subject lines that make people stop, click, and engage.
1. Keep It Short & Sweet
Most people read emails on their phone. That means you’ve got about 40–50 characters to make an impact.
Tip: Aim for 6–10 words max.
Examples:
- “You forgot something…”
- “50% Off Ends Tonight”
- “3 tips to boost your open rate”
2. Create Curiosity
Tease the content without giving it all away. People love to uncover the mystery.
Examples:
- “What no one tells you about email marketing”
- “You’ll never believe this hack”
- “This changed everything for me”
3. Use Numbers & Lists
Numbers stop the scroll. They promise clear and digestible info.
Examples:
- “7 subject lines that always work”
- “3 secrets to higher open rates”
- “5 reasons your emails get ignored”
4. Add Personalization
Use the subscriber’s name or location if possible. Personalized emails get higher open rates.
Examples:
- “Hey [Name], quick question…”
- “Special deal just for you”
- “This one’s for New York marketers”
5. Trigger Emotions or FOMO
Fear of missing out works — so does making people feel excited, curious, or even anxious (in a good way).
Examples:
- “ Only 12 hours left…”
- “This opportunity won’t last”
- “Are you ready for this?”
Avoid These Mistakes:
- Using ALL CAPS
- Overusing emojis
- Being too vague (e.g., “Check this out”)
- Using spammy words like “FREE!!!” or “Buy now!”
Bonus: A/B Test Everything
No matter how good your subject line seems, always test it. Your audience’s behavior will tell you what really works.
Final Thought
A killer subject line isn’t just clever — it’s clear, relevant, and benefit-driven. Spend time crafting it, because that one line could be the difference between a scroll and a sale.