Brand Voice Guide: How to Build One (Free Template)

By Frederik Baun, conversion copywriter and founder of Words Sounds Visuals

A brand voice guide is the document that tells anyone writing for your brand, human or AI, exactly how you sound and why. Not three adjectives on a slide. It’s a working reference specific enough that a stranger could read it and write one sentence that passes for yours.

I’ve built one for my own writing and dozens more for clients, and I use the same 9-part framework every time. Here it is, with real examples and the fastest way I’ve found to fill it in.

What a Brand Voice Guide Needs to Do

A real brand voice guide goes past a list of traits. Friendly, bold, and approachable are three words that could sit on the wall of any company in any industry, including the boring one two doors down that blends into the wallpaper.

The test I use is simple. If a rule could describe five other brands without changing a word, cross it out. A real rule survives that test because it points at something only your brand does.

Every writer drifts back to generic phrasing without a rule to check against, and AI drifts fastest of all. Its default register is confident, friendly, and professional for any brand that hasn’t handed it anything sharper to work from.

A real brand voice guide gives you a rule you can apply to a sentence you haven’t written yet. “We answer our own rhetorical questions immediately” is a rule like that. “We sound confident” isn’t, because you can’t check a draft against it.

How to Create a Brand Voice Guide, Part by Part

I run every voice I analyze through the same nine sections, in the same order, and I never skip one. Each part catches something the previous one misses.

1. High-level snapshot. What the writing is mainly trying to do (persuade, teach, entertain, sell) and who it sounds like (mentor, peer, entertainer, expert).
2. Voice and tone. Formal or informal, direct or indirect, and whether the tone holds steady or shifts depending on the topic.
3. Structure and flow. How pieces open, how they close, and the transitions the writer reaches for over and over.
4. Sentence-level style. Length, rhythm, and punctuation habits, including where short lines land for emphasis (one sharp sentence after two long ones does the most work).
5. Diction and word choice. The words leaned on, the words avoided, and where the metaphors come from.
6. Rhetorical devices. Storytelling, contrast, authority signals, and whatever triggers the reaction the writer is going for: curiosity, urgency, or trust.
7. Formatting and presentation. Paragraph length, white space, bullets, and how headings get phrased.
8. Style rules checklist. The part that turns observation into instruction, five to ten specific rules grouped under voice, sentence, and structure.
9. Mini emulation. Five to eight sentences written in the voice, as proof the first eight parts are right. Read it next to a real sample. If you can’t tell them apart, the guide works.

Parts one through seven are observation. Part eight is where the guide becomes usable, because a rule someone can check a draft against is worth more than a paragraph someone has to interpret.

Brand Voice Guide Examples That Show the Difference

Here’s what the gap between a vague trait and a specific rule looks like in practice, pulled straight from my own guide.

Anyone can claim “confident.” Only a guide with a rule like “states, doesn’t opine” can catch you hedging with “I think” in your next draft and tell you to cut it.

Where Most Brand Voice Guides Fall Apart

I worked with a coaching brand earlier this year whose old guide had four adjectives on a shared doc: warm, expert, direct, playful. Every writer on the team read those same four words and pictured a different person.

One freelancer wrote long, story-heavy posts. Another wrote short, list-heavy ones. Both were technically warm, expert, direct, and playful, and neither sounded like the other, or like the founder.

Adjectives describe a feeling. A feeling doesn’t tell a writer what to do with a sentence, so everyone filled the gap with their own instincts.

That gap costs more than an internal headache. A prospect reading two posts from the same brand that sound like two different companies starts to wonder who’s really behind the page, and that hesitation is exactly where they close the tab instead of booking a call.

A 9-part framework closes that gap. Every section forces a claim you can point back at a real sentence, so a word like “playful” turns into something a writer can check on page three of a proposal.

What This Means If AI Writes Any of Your Content

Most brand voice guides were written for a team of human writers who’d read the same doc twice and mostly remember it. Now AI handles a growing share of that first-draft work, and it starts from zero every single time.

If AI handles your first drafts, outlines, or full posts, the guide is what keeps the output on brand instead of sounding like everyone else’s chatbot. Feed a model “be confident and friendly” and it defaults to the same handful of safe words any brand gets when it hasn’t told the model otherwise.

Feed it a rule like “states, doesn’t opine, no hedging with ‘I think’” and it has something concrete to check its own draft against, the same way a new hire would.

The 9-part framework matters more now than it did five years ago, because a vague guide was a minor annoyance when one person wrote your copy. It’s a liability when a model drafts dozens of posts a month and the drift compounds before anyone catches it.

The Brand Voice Guide Template, Built From Your Own Writing

The framework above works filled in by hand, with a highlighter and old emails spread across your desk. It also works if you skip the desk entirely.

Filling in nine sections by hand from scratch takes a few hours if you’re organized and honest with yourself about what your writing really does. Most people stall around section four, once the traits get harder to spot in their own work.

I built the Writing Style Analyzer to run the same 9-part framework against a sample of your own writing and hand back the guide already filled in: the snapshot, the tone, the sentence habits, the rules, and the mini emulation that proves the rules are right.

Paste in 500 words of your best writing, emails, posts, a few pages of your website, and it reads for what the writing says about you, not what you meant when you wrote it. That gap is usually where the real voice hides.

It’s free, and it gets you from a blank template to a guide you can hand to a new writer, or paste into an AI, on the same afternoon.

Once you have the guide, paste the whole thing at the top of a chat with any AI and tell it to write in that voice. The rules do the work that a generic prompt like “sound professional but approachable” skips entirely.

Either way you build it, the result should pass the same test. A stranger, or an AI, reads the guide and writes one sentence that sounds like you. Everything else in the document is just there to get you to that sentence.