Bird analysed more than 4.2 billion Black Friday emails from nearly 7,000 brands, in a post published on December 4, 2025, and found that subject lines with explicit Black Friday branding made up 38 percent of volume from 20 percent of sends. That is the best data available on what Black Friday email subject lines do, and Black Friday 2026 is on Friday, 27 November, the day after Thanksgiving.
This guide turns the Bird and Omnisend findings into rules you can test: length, urgency, emojis, discounts and personalisation, with examples and a testing plan. Both sources say audiences differ, so treat patterns as hypotheses. Omnisend and Bird both sell email tools, so read their conclusions with that in mind.
What the Data Says About Black Friday Subject Lines
Bird’s findings describe volume and volume efficiency, which the post does not define, so read them as relative patterns and not open rates. Omnisend’s article adds advice and self-reported open rate examples without clear methodology.
| Pattern | Finding | Source |
|---|---|---|
| Explicit Black Friday branding | 38 percent of volume from 20 percent of sends | Bird |
| Emojis | 38 percent of volume, 30 percent higher volume efficiency than non-emoji campaigns | Bird |
| Urgency | 10 percent of emails, 18 percent of volume | Bird |
| Best length | 21 to 40 characters; average high performer 44 characters and 8 words | Bird |
| You and your | In 21 percent of emails but only 14 percent of volume | Bird |
| Sender recognition | 94.5 percent of 2,000 plus shoppers said it mattered | Omnisend citing Mailjet |
These are descriptive findings about past campaigns, not guarantees. Your list and your brand may behave differently.
Length: Short Wins, and the Key Words Come First
Bird found the 21 to 40 character range performed best, and warns against going over 60 characters. Omnisend recommends five to seven words and notes an estimate that about 33 characters are visible on most mobile devices.
The practical rule is simple: put the offer or the deadline in the first words, and treat anything after 40 characters as a bonus that many readers will not see.
Urgency Without Fake Pressure
Urgency performed above its share in Bird’s data, but Omnisend says final hours has lost effectiveness and recommends time-specific language such as ends at midnight.
| Weak urgency | Stronger, specific urgency |
|---|---|
| Final hours | Ends at midnight tonight |
| Hurry, limited time | Early access ends Thursday 6 PM |
| Do not miss out | Prices go up Monday |
| Last chance | Cyber Monday offer ends 30 November |
Only use a deadline you will honour. False urgency harms trust, and it damages the sender recognition that Omnisend says shoppers value.
Emojis, Capitals and Punctuation
Bird found emoji campaigns accounted for 38 percent of volume and had 30 percent higher volume efficiency, and 81 percent of emoji users used only one. It recommends avoiding full all caps, multiple exclamation marks, more than two emojis and vague discount language.
Omnisend gives emoji examples but no quantified emoji results, and suggests testing holiday-themed against shopping-themed emojis. Start with one emoji at the start or end and compare it with a plain version.
Discounts, Early Access and Personalisation
Omnisend’s analysis found 30 percent, 50 percent and 25 percent discount formats appeared often and outperformed other formats, and Bird says 50 percent off was the top discount level. Omnisend also says first-name personalisation adds little on Black Friday, while browse or purchase history works better.
| Subject line type | Example to adapt | Note |
|---|---|---|
| Early access | Early access: Black Friday deals open to you first | Reward subscribers |
| Specific discount | Black Friday: 30 percent off your wishlist | Use a real number |
| Behaviour-based | Your cart is on sale for Black Friday | Based on browsing |
| Deadline | Black Friday ends at midnight tonight | Use a real deadline |
| Gift angle | Gifts under 50 dollars, ready for Black Friday | Add your own price points |
These examples are our own templates, not tested lines. Test them on your list and keep the winners.
How to Test Your Subject Lines Before 27 November
Omnisend advises running subject line A/B tests in October and November. Bird also recommends A/B testing. Start now, with your warm-up emails, so the learning is ready for the big days.
| Week | Test |
|---|---|
| Now | Short versus long (about 30 versus 50 characters) |
| Next | Emoji versus no emoji |
| Week before | Specific deadline versus general urgency |
| Black Friday week | Early access versus public launch wording |
Our guide to email marketing benchmarks shows how to judge your results, and our piece on how to build an email list helps you grow the audience you are testing on.
