Birthday Email Subject Lines: 5 Examples (and a Free Tester)

The birthday email has an unfair advantage: it's genuinely about the reader on a day they feel special. Squandering that with a plain 'Happy Birthday' and a coupon wastes one of the year's highest-intent sends.

5 birthday email subject line examples that work

• happy birthday, {first_name} — here's your gift47 chars
• we baked you a discount23 chars
• it's your day, so it's on us28 chars
• a birthday treat inside23 chars
• open me — it's your birthday28 chars

Rules for birthday email subject lines

• Make the gift feel like a gift, not a sale ('a treat, on us').
• Personalize the name — a nameless birthday email breaks the illusion instantly.
• Give a generous, low-friction reward with a comfortable redemption window.
• Keep it celebratory; a hard CTA on someone's birthday reads as tone-deaf.