Shopify Email Subject Lines: 50 Proven Formulas That Get Opened

Subject Lines Are the Gate to Every Email

An email that isn’t opened earns zero revenue. The subject line determines whether your carefully crafted email is read by 40% of your list or 12%. The difference between a 20% open rate and a 40% open rate — all else equal — doubles the revenue from every email send. Subject line testing is the highest-leverage copywriting task in email marketing, because a single word change affects every send forever.

The Psychology Behind High-Open Subject Lines

• Curiosity — creates an information gap the reader must close by opening. “The email we didn’t want to send” or “This is unusual for us”
• Self-interest — makes clear what benefit the reader receives. “Your cart just got cheaper” or “Save 20% — 4 hours only”
• Urgency/scarcity — triggers loss aversion. “Last 12 hours” or “Only 3 left at this price”
• Social proof — triggers FOMO. “3,842 customers bought this in the last 7 days”
• Personalisation — seeing your name increases open rate by 26%. “[First name], this is for you”

20 Abandoned Cart Subject Lines

• “You left something behind”
• “Still thinking about it?”
• “Your cart misses you”
• “[Product name] is waiting for you”
• “Before it sells out…”
• “Did something go wrong at checkout?”
• “Your [product] is running low on stock”
• “Complete your order — we’ll give you 10% off”
• “Don’t let this one go”
• “We saved your bag — but not for long”
• “Is this the one you want, [first name]?”
• “Quick question about your order”
• “Your cart expires tonight”
• “Still interested? Here’s 10% off”
• “[Product name]: here’s what others think”
• “One step away from [benefit of product]”
• “Your [product] has been put on hold”
• “Hurry — popular items sell out fast”
• “We noticed you were checking out [product]”
• “Last chance to grab [product name]”

15 Welcome Email Subject Lines

• “Welcome to [Brand] — here’s your 10% off”
• “You’re in. Here’s what happens next”
• “[First name], welcome to the family”
• “Your exclusive welcome offer is inside”
• “We’re glad you found us. Here’s why”
• “The [Brand] story — and why it matters to you”
• “Everything you need to know about [Brand]”
• “Your welcome gift is waiting”
• “3 things our best customers love about [Brand]”
• “Meet the brand [publication] called ‘game-changing'”
• “Before you shop, read this”
• “Welcome — and here’s what sets us apart”
• “You joined [number] subscribers. Here’s your reward”
• “Start here — our most popular products”
• “[First name], you qualify for free shipping today”

15 Promotional Campaign Subject Lines

• “20% off — 48 hours only”
• “The sale our accountant hates”
• “Biggest discount we’ve ever offered”
• “[First name], your exclusive offer is live”
• “This doesn’t happen often”
• “New arrivals — and they’re selling fast”
• “[Product category] under £25”
• “We don’t do this often: 30% off everything”
• “Your early access starts now”
• “Members only: 25% off before public launch”
• “Flash sale — 3 hours to shop”
• “The [season] edit is here”
• “Prices drop at midnight”
• “[Number] of our best products, on sale today”
• “Shop before [specific date/event]”

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