- Subject lines that name the offer earned about 1.46x a brand's typical revenue per email, across 3,176 campaigns from 9 brands.
- Questions earned about 18% less per email than normal, at the same open rate.
- The best Black Friday lines were plain: "Black Friday Starts Now!" made $25,276 for a snack brand, 11.8x its typical email.
- The most common mistake I see is being too crafty. People on your list just want to know what they'll get and where to get it.
- Apple Intelligence can replace your preview text with its own summary, so every subject line has to make sense on its own.
This is for Shopify founders on Klaviyo writing their BFCM emails right now: what the data says, real sale lines with what they made, and lines to adapt for each day.
What makes a Black Friday email subject line work?
Here's what the data shows. Each style is measured against the same brand's typical revenue per email, so 1.0x means a normal send for that brand. The multiples cover all campaigns, not just Black Friday week. In my experience, BFCM sends themselves usually land 2 to 5x a brand's regular campaign, so read these styles as the floor, not the ceiling.
- Names the offer: about 1.46x revenue
- Holiday or sale event: about 1.3x revenue
- Free gift or bonus: about 1.6x the clicks, 1.13x revenue
- Deadline: about 1.06x revenue
- Has an emoji: about even, 1.02x revenue
- Curiosity tease: 0.93x revenue
- 1 to 4 words: 0.92x revenue
- Question: 0.82x revenue, about 18% less per email
Here's how I read that for Black Friday.
Name the offer and the event. "Black Friday: 25% off everything" tells people why to open and why to buy. On Black Friday you finally have real news, so say it.
Add the bonus if you have one. Free gift lines pulled about 1.6x the clicks. The revenue lift was smaller, so treat the gift as a sweetener on top of the offer, not a replacement for it.
Deadlines help a little. About 1.06x on average. Use one at the real end of a real sale.
Skip the question. Questions got opened at the same rate and still earned about 18% less per email. My read: people opened, didn't find a reason to buy, and left.
Don't get cute. Curiosity teases and 1 to 4 word lines both landed slightly below normal. This is the mistake I see most in accounts: being too crafty. Customers on retention channels just want to understand what they'll receive and where they can get it. Black Friday isn't the day to make people guess.
Emoji won't save you or sink you. Across all 9 brands they came out about even. In a separate check of 4 brands in one category, emoji helped two and hurt two. It depends on your list.
A separate look at 2,821 campaigns across 7 brands lands in the same place: news beats brand voice, and vague questions were the worst pattern.
Real Black Friday and sale subject lines, and what they made
These are real lines from the same data, pulled from more than one snack brand. The multiple compares each send to that brand's typical email, which is the fair way to compare a big brand with a small one.
- "Extra inventory means our biggest sale yet." A snack brand. $46,385, 6.9x.
- "Your Black Friday came EARLY!" A snack brand. $28,273, 9.7x.
- "Black Friday Starts Now!" A snack brand. $25,276, 11.8x.
- "Your special discount ends at Midnight!" A snack brand. $11,560, 7.2x.
- "This expires in 12 hours" A snack brand. $7,889, 6.5x.
- "UP TO 50% OFF + FREE SHIRT & BAG" A sports training tech brand. $2,110, 14.4x.
- "Only 3 hours left..." A subscription wellness brand. $1,714, 4.8x.
They all name the event, the offer, or the deadline. Nothing to decode. The biggest earner even gives a reason for the sale: extra inventory.
There's one question that worked, too. "Didn't Get What You Wanted For Christmas?" made 11.6x for the sports training tech brand. It isn't vague. It names a specific moment the reader knows.
The full Subject Line Swipe File has 43 lines in 8 plays, and it's free.
Your subject line has to stand on its own now
On newer iPhones with Apple Intelligence, Apple Mail can swap your preview text for its own AI summary under the subject line.
An Oracle email team wrote it up in late 2024. They say the summaries are on by default, usually run about two lines, and that Apple sometimes rewrites the preheader and sometimes ignores it completely.
So don't lean on preview text to finish the thought. Oracle's team suggests getting key info into roughly the first 20 characters. On Black Friday, that's the offer. Still write preview text, 80 to 100 characters, because plenty of people will see it.
Your BFCM 2026 subject line plan, day by day
These are lines I'd write by applying the patterns above. They're not results. Treat them as starting points and swap in your own product, offer and deadline. The send days follow my BFCM email strategy: Black Friday is Friday, Nov 27, and Cyber Monday is Nov 30.
Early access (Tue Nov 24 or Wed Nov 25)
Your customers and recent clickers get in first, so the line says so.
- Line to adapt: "Your Black Friday starts early: 25% off"
- Line to adapt: "Customers first: Black Friday is open"
Black Friday (Fri Nov 27)
The biggest send of the year. Event plus offer, stated flat, plus the bonus if you have one.
- Line to adapt: "Black Friday: 25% off everything"
- Line to adapt: "Black Friday is live + a free gift"
- Line to adapt: "Our biggest sale of the year starts now"
The weekend (Sat Nov 28 and Sun Nov 29)
One a day to your engaged people. Same offer, a new angle on it.
- Line to adapt: "Still on: 25% off everything"
- Line to adapt: "Free gift with every order this weekend"
Cyber Monday (Mon Nov 30)
Event, offer, and the fact that it's the last day. If nothing changed since Friday, don't pretend it's a new sale.
- Line to adapt: "Cyber Monday: last day for 25% off"
- Line to adapt: "Cyber Monday: 25% off + free shipping"
Last chance (Monday evening)
A real deadline with a real time. Only use one you'll keep, and stop when you said you would.
- Line to adapt: "25% off ends at midnight"
- Line to adapt: "Only 3 hours left for 25% off"
Restock (if something sells out)
When something sells out, the restock email is your biggest send of the month. A snack brand's "We're back baby!" made $48,771, 14.4x its typical email. Give it its own send.
- Line to adapt: "It's back: [best seller]"
- Line to adapt: "Back in stock: the one that sold out"
What should you do first this week?
It's the last week of October. Two things come before subject lines:
- Lock your November calendar and your BFCM offers. The subject line is the last 50 characters of a plan, not the plan. If the offers aren't set, set them.
- Mine your own data. Export your Klaviyo campaign history, upload the file to Claude or ChatGPT, and have it find the patterns in your winning subject lines, for your brand specifically. The styles above are averages across 9 brands. Your list has its own tape, and it outranks mine.
If the account has bigger problems than subject lines, run the Klaviyo audit checklist first.
How to test subject lines before the sale
These are averages. Your list can break them, so check before Nov 24:
- Use your regular sends. Test between now and early access, not during the sale.
- Change one thing. Offer named vs not, emoji vs none. Not both at once.
- Split the same segment. Same audience, same send time.
- Judge by clicks and revenue, not opens. Questions got the same open rate and still made less. Apple Mail auto-opens make opens a poor judge anyway.
And click every link before you hit send. Clicks with no sales usually means something broke.
Where these numbers come from
The style multiples come from 3,176 Klaviyo campaigns across 9 brands, $10.3M in campaign revenue, 189M emails delivered, sent 2020 to 2026. Each multiple compares a line to that brand's typical revenue per email. It covers all campaigns, not only BFCM sends, and each style shows up in 4 to 7 brands, so read it as directional. The news vs brand voice finding comes from 2,821 campaigns across 7 brands, and the emoji split from 4 brands in one category. More in my CPG email marketing benchmarks.
FAQ
What's the best Black Friday email subject line?
One that names the offer plainly. In my data those lines earned about 1.46x a brand's typical email, and "Black Friday Starts Now!" made 11.8x for a snack brand. Event plus offer is the safest place to start.
Should I use a question in a Black Friday subject line?
I'd avoid it. Questions earned about 18% less per email at the same open rate. The exception is a question tied to a real moment, not a vague "Ready for something big?"
Do emoji help Black Friday subject lines?
About even on average, and in a 4-brand check they helped two and hurt two. Test on your own list.
How long should a Black Friday subject line be?
My starting rule is under 50 characters with the offer up front. Very short 1 to 4 word lines landed slightly below normal, so don't cut the offer to save space. More in email subject line best practices.
Do subject lines matter if Apple rewrites my preview text?
More than before. If Apple Mail shows its own summary instead of your preview text, the subject line is the only part you fully control.
Founder of Bardown Digital, a Chicago-based Klaviyo email and retention agency for Shopify brands. He's worked with brands doing $500K to $100M a year, with $100M+ in email-attributed revenue across them.