brand voice
How to Write Brand Voice Guidelines Your Team Will Actually Use
By Priya Mehta · · 10 min read
To write brand voice guidelines your team will actually use, keep them short and concrete: three or four voice traits defined with “this, not that” pairs, a tone map for your most common situations, a word list, and before-and-after rewrites of real copy. Test the guide on live work, give it an owner, and write a version your AI tools can follow. Adjectives alone change nothing.
Most voice guidelines fail the same way. A workshop produces a slide that says the brand is “bold, human, and smart,” the deck goes into a shared drive, and six months later the website, the sales emails, and the CEO’s LinkedIn posts sound like three different companies. The problem is rarely the traits. It is that nobody translated them into decisions a writer can make on a Tuesday afternoon.
Photo: Markus Winkler on Unsplash.
What is the difference between brand voice and tone?
Brand voice is the stable personality in how your company writes and speaks. Tone is how that voice flexes for the reader, the channel, and the moment. A good guide defines both, because a voice with no tone rules sounds the same in a launch announcement and an outage notice.
Mailchimp’s public Content Style Guide puts the distinction in one line: “You have the same voice all the time, but your tone changes.” Microsoft’s style guide makes the same point, describing a constant voice while the company adapts its tone “from serious to empathetic to lighthearted” to fit the context and the customer’s state of mind.
Nielsen Norman Group gives teams a practical vocabulary for tone. In its article on the four dimensions of tone of voice, it describes four spectrums every piece of copy sits on:
| Dimension | One end | Other end |
|---|---|---|
| Formality | Formal | Casual |
| Humor | Serious | Funny |
| Respect | Respectful | Irreverent |
| Energy | Matter-of-fact | Enthusiastic |
Placing your brand on each spectrum, and deciding how far it may move in different situations, is more useful than any list of adjectives.
Why does brand voice matter for trust, not just style?
Voice matters because readers judge credibility from how you write before they judge what you say. Tone that feels wrong for the category costs trust, and trust is what drives recommendations.
Nielsen Norman Group tested this directly. In a study of tone of voice and brand perception, researchers showed people nearly identical web copy for fictional insurance, banking, hospital, and home security brands, varying only the tone. Trustworthiness was the strongest predictor of whether people would recommend the brand: on average, 52% of the variability in desirability scores was explained by trustworthiness, with friendliness adding only about 8% more. A playful insurance site was rated friendlier than a serious one, but no more likely to be recommended, and the serious version was rated more trustworthy. Meanwhile, a casual, conversational bank beat a formal one on friendliness, trustworthiness, and likelihood to recommend.
The lesson for leadership teams is not “be serious” or “be casual.” It is that tone is a business decision with measurable effects, and it should be made deliberately for your category and audience.
Voice also matters for earned media, which is why we treat it as part of a PR-led brand strategy. Reporters, editors, and AI engines all encounter your company through words: a press release, a quote, an executive byline, an About page. A distinctive, consistent voice makes those words recognizable. An inconsistent one makes the company sound like whoever wrote the last draft.
What should brand voice guidelines include?
Brand voice guidelines should include only what helps a writer make a decision. For most companies that fits on two to four pages.
| Section | What it contains | Why writers need it |
|---|---|---|
| Voice traits | Three or four traits, each with “this, not that” | Sets boundaries, not just aspirations |
| Tone map | How the voice flexes in five to eight common situations | Prevents launch-day tone in a crisis note |
| Word list | Words you use, words you avoid, product and category terms | Removes the most common inconsistencies |
| Mechanics | Capitalization, numbers, dates, contractions, punctuation rules | Settles recurring arguments quickly |
| Before and after | Real copy rewritten into the voice | Shows what the traits mean in practice |
| Spokesperson notes | How executives sound in quotes and bylines | Keeps press and leadership content on voice |
| AI instructions | A condensed version written for AI writing tools | Keeps drafted copy from drifting to generic |
| Ownership | Who maintains the guide and approves changes | Stops the guide from going stale |
The “this, not that” pairs do most of the work. Mailchimp’s guide includes a line that shows the technique: “We’re weird but not inappropriate, smart but not snobbish.” Each pair names the trait and the failure mode beside it, which tells a writer where the line is.
How do you write brand voice guidelines, step by step?
The process below is the one we use when voice work is part of a brand or messaging engagement. It starts with real copy, not adjectives.
- Audit real copy. Collect 30 to 50 recent pieces across channels: homepage, product pages, sales emails, press releases, support replies, executive posts. Mark the pieces that sound most like the company at its best and the ones that sound least like it.
- Define three or four traits with boundaries. Draw them from the best examples and your messaging framework. For each trait, write one sentence on what it means, a “this, not that” pair, and one example sentence.
- Map tone across situations. List the five to eight situations your team writes for most often and place each on the four tone spectrums. A product launch may sit further toward enthusiastic; a security incident note sits firmly at serious and matter-of-fact.
- Rewrite real examples. Take five pieces of existing copy and rewrite them into the voice, showing before and after side by side with a note on what changed.
- Test on live work. Ask three writers from different teams to use the draft for two weeks on real assignments. Note where they hesitated or disagreed, and fix those sections.
- Assign an owner and publish two versions. One owner, usually in brand or communications, approves changes. Publish the full guide for people and a condensed version for AI writing tools.
What does a one-page voice template look like?
A one-page template keeps the essentials where people will see them. Adapt the structure below and replace every bracket with your own words.
Our voice in one sentence: [We sound like a senior practitioner explaining something clearly to a smart peer.]
Trait 1: [Direct]. We say the point first. Direct, not blunt. Example: “[Your rewritten sentence.]”
Trait 2: [Specific]. We use numbers, names, and examples instead of adjectives. Specific, not technical for its own sake. Example: ”[ ]”
Trait 3: [Warm]. We write to one person and acknowledge what is hard. Warm, not casual about serious things. Example: ”[ ]”
Tone dial: Launches: [moderately enthusiastic]. Customer problems: [serious, matter-of-fact]. Executive bylines: [confident, first person]. Social: [more casual, never irreverent about customers].
We say / we avoid: [customers / users], [category term / old term], [no “revolutionary,” “game-changing,” or “best-in-class”].
Mechanics: [Sentence case headlines. Numerals for 10 and above. Contractions allowed except in legal copy.]
How should brand voice guidelines work with AI writing tools?
Brand voice guidelines now need a version written for AI tools, because much first-draft copy starts there. Without explicit instructions, AI drafts drift toward a generic, adjective-heavy register that sounds like every other company.
A useful AI version is short and literal. Include the one-sentence voice summary, the traits with their “not that” boundaries, the banned word list, mechanics rules, and two or three before-and-after examples. Tell the tool what to avoid as clearly as what to do. Then have a person edit every draft against the full guide.
There is a second reason to take this seriously. Several respected outlets now refuse AI-written contributed pieces. Supply Chain Dive’s opinion guidelines say generative AI may not be used to write op-eds, and STAT’s First Opinion guidelines say AI may not be used to write any part of a piece (see our Supply Chain Dive and STAT profiles). For executive bylines, the voice guide should describe how the executive actually talks, gathered from interviews and recordings, so the draft starts from their words rather than a tool’s.
Hypothetical example: three teams, one voice
This scenario is hypothetical, but it reflects a pattern we see often in growth-stage companies.
A Series B health software company has a brand book with four adjectives: “innovative, caring, expert, bold.” Its homepage reads like a press release, its sales emails are breezy and full of exclamation points, and its CEO’s LinkedIn posts are thoughtful and plain. Prospects notice the mismatch, and a trade reporter covering the company quotes a sales email’s overstatement back to the CEO in an interview.
The company rewrites its guidelines. It keeps three traits, drawn from the CEO’s best posts: clear, specific, and steady. It adds “steady, not cold” and “specific, not clinical” as boundaries, and maps tone for six situations, including a patient-facing incident note. It rewrites ten real pieces of copy as examples and loads a condensed version into the writing tools its marketing team uses. Within a quarter, the homepage, the sales sequence, and the CEO’s bylines read as one company. The next interview goes differently.
What do most teams get wrong about brand voice guidelines?
Most teams describe the voice they want instead of showing the voice they need. The fixes are mostly about specificity and ownership.
| Mistake | What happens | Do this instead |
|---|---|---|
| Five or more adjectives | Nobody remembers them | Three or four traits with boundaries |
| Traits with no “not that" | "Bold” becomes reckless, “friendly” becomes flippant | Pair every trait with its failure mode |
| No tone rules | Celebration tone in a crisis note | A tone map for common situations |
| No examples | Writers interpret traits differently | Before and after rewrites of real copy |
| A 60-page brand book | Nobody opens it | Two to four pages for voice, linked from where people write |
| Executives exempt | Bylines and quotes sound like a different company | Spokesperson notes in the guide |
| No AI version | AI drafts sound generic | A condensed, literal version for tools |
| No owner | The guide goes stale within a year | One owner, reviewed twice a year |
When should you revisit your brand voice?
Revisit your voice when your audience, category, or position changes, and review the guide at least twice a year. A company moving from founders to enterprise buyers, entering a regulated category, or preparing a rebrand usually needs its tone map rewritten even if the core traits survive.
Voice is also part of how a company is described elsewhere. Consistent language across your site, press materials, and executive content makes it easier for reporters and AI engines to describe you the same way, which is a core idea behind entity strategy for generative engine optimization. Our brand strategy and messaging practice builds voice guidelines as part of positioning and messaging work, tested against how reporters and buyers actually read. If your company sounds like three different companies, let’s talk.
Frequently asked questions
How long should brand voice guidelines be?
Two to four pages is enough for most companies: traits with boundaries, a tone map, a word list, mechanics, and examples. Longer brand books can hold visual identity and detailed editorial rules, but the voice section people consult daily should be short enough to read in five minutes.
How many voice traits should a brand have?
Three or four. Fewer than three rarely captures a personality; more than four becomes hard to remember and apply. Each trait should come with a “this, not that” pair and an example sentence.
What is the difference between a style guide and brand voice guidelines?
A style guide covers mechanics: grammar, punctuation, capitalization, numbers, and formatting. Brand voice guidelines cover personality and tone: how the company sounds and how that changes by situation. Most companies combine them, with voice first and mechanics as a reference section.
Should executives follow the brand voice?
Executives should be recognizably on brand, but not interchangeable with the company account. Spokesperson notes should describe how each executive sounds, drawn from interviews and their own writing, while sharing the brand’s core traits and word list.
How do you keep AI-generated copy on brand?
Give AI tools a condensed, literal version of the guide with traits, boundaries, banned words, mechanics, and real before and after examples, then have a person edit every draft against the full guide. For contributed articles, check each outlet’s rules, since some reject AI-written submissions entirely.
