Writing a brand voice document once, using it everywhere

What it is good at

• Good at spotting specific, describable patterns in existing writing rather than vague adjectives.
• Once written, the voice document can be reused across every future AI session instantly.
• Can be tested by asking the model to write something new and checking it against the source examples.
• Works for both a solo creator's personal voice and a brand's collective voice.

Where it falls short

• The output is only as good as the examples you feed it, thin or inconsistent samples give a vague voice document.
• It describes what's on the page, not your intent, always sanity-check against your own gut sense of the brand.
• A voice document needs occasional review as the brand or your writing genuinely evolves.

How to use it for creative work

1. 01

   Choose four or five strong examples

   Pick pieces of writing you're genuinely happy represent the brand, not everything you've ever published, just the best examples of the target voice.

2. 02

   Ask for a precise description, not adjectives

   Request specifics: typical sentence length, vocabulary level, punctuation habits, what it never says, the emotional register. Ban vague words like 'friendly' or 'professional' on their own, ask for what friendly actually looks like in practice.

3. 03

   Get the never-list

   Ask specifically for phrases, words or structures the brand should never use, clichés, competitor language, overused industry jargon, since a 'never' list prevents drift as much as a 'do' list encourages it.

4. 04

   Test it on something new

   Give the model a fresh brief and the new voice document only (not the original examples) and ask it to write a short piece. Compare it against the original examples to see if the document actually captures the voice.

5. 05

   Save it as your standard opener

   Keep the finished document under 200 words and paste it at the start of every future writing session, so each new draft starts already sounding like you rather than needing correction.

Ready-to-use prompts

Here are four pieces of our published writing: [paste]. Describe the voice precisely: typical sentence length, vocabulary level, punctuation habits, what it never does, and the emotional register. No vague adjectives without a concrete example attached.

Based on these same examples, list ten words, phrases or sentence structures this brand should never use, think clichés, overused industry jargon, or anything that sounds like a generic competitor.

Using only this voice document (not any other examples): [paste document], write a 100-word piece about [new topic]. I will compare it against our original examples separately.

Here is our voice document: [paste]. Score this draft against it out of 10 and list the three specific lines that break the voice most, with a suggested fix for each: [paste draft]

Our voice has shifted slightly, here are three recent pieces: [paste]. Compare them to our existing voice document: [paste] and suggest what specifically should be updated, keeping everything still accurate as is.

Questions people ask

How long should the finished voice document be?

Under 200 words is a good target, long enough to be specific, short enough that you'll actually paste it into every session without skipping it.

Does this work for a solo freelancer, not just a brand team?

Yes, the same method works for an individual's personal writing voice and is arguably more useful there, since there's no style guide to fall back on otherwise.

How often should the voice document be revisited?

Every six to twelve months, or whenever you notice recent writing consistently diverging from the document, is a reasonable check-in point.