Prompt details

Tested on

Claude Opus 5.5

Length

480 words · 3 fill-ins

Example input

[Samples of your copy]: Product page, All-Purpose Refill Concentrate: "One bottle. Forever. Pour this 30 ml concentrate into our glass spray bottle, top up with tap water, and you've got 500 ml of all-purpose cleaner that works on counters, sinks and stovetops. Smells like grapefruit, not like a hospital." Product page, Glass Spray Bottle: "Made to be refilled, not replaced. Thick glass, a silicone sleeve for when it slips, and a trigger we tested 10,000 times. Buy it once." Product page, Dish Soap Bar: "Introducing our revolutionary dish soap bar! This amazing, game-changing product will transform your kitchen routine forever. 100% chemical-free and totally non-toxic, it's the eco-friendly choice for the conscious consumer." Product page, Laundry Sheets: "No jug. No drips. One sheet per load, two for the gym bag. 60 sheets fit in an envelope, so shipping them costs less carbon than shipping water." Product page, Refill Bundle: "Everything you need to go plastic-free in the kitchen and bathroom. Save 15% when you bundle. Planet-positive cleaning starts here!" Instagram caption: "Our founder's kitchen sink, 6:42 a.m., two toddlers and zero patience. This is where we test everything. If it doesn't work here, it doesn't ship. 🍋"

[Your values and customers]: Fernbrook is a 6-person refill cleaning brand. Values: less plastic, honest about what's in every product, and products that actually clean. Customers are busy parents and renters, 28 to 45, who want less plastic but aren't hardcore eco people and roll their eyes at preachy green brands. We never want to guilt-trip anyone.

[Brands you like and dislike]: We like how Patagonia talks about repairs: plain and a bit stubborn. We like that Oatly is funny on the carton, but it's too much for us. We don't want to sound like typical green brands: leaves everywhere, "pure", "planet-positive", lots of exclamation marks.

Example output

1. The voice in one line

Talk like the parent who already tested it at the kitchen sink: short, specific, a little stubborn, never preachy.

2. Voice traits

Trait	We are	We are not	From our copy
Plain-spoken	Short sentences and fragments that say what the product is and how to use it. Like Patagonia on repairs: state it and stop.	Blunt or curt. We still explain. Not "Introducing our revolutionary…"	"No jug. No drips. One sheet per load, two for the gym bag."
Specific	Numbers, times, places and amounts the reader can picture: 30 ml, 500 ml, 60 sheets, 6:42 a.m.	Technical or full of jargon. No vague hype like "amazing" or "game-changing."	"Pour this 30 ml concentrate into our glass spray bottle, top up with tap water, and you've got 500 ml of all-purpose cleaner."
Stubborn about what works	Firm about quality and buying less. We show the test rather than claim the result.	Preachy, guilt-tripping or smug about the planet. We never lecture the reader.	"If it doesn't work here, it doesn't ship." / "Made to be refilled, not replaced."
Dry, occasional wit	One light, everyday joke per piece at most, often a twist at the end of a sentence. We take a small dose of Oatly's habit of talking to you like a person.	A comedy act. No running bits, wordplay pile-ups or jokes at the reader's expense.	"Smells like grapefruit, not like a hospital." / "two toddlers and zero patience"

Where our samples disagree: the Dish Soap Bar and Refill Bundle pages use hype words, exclamation marks, "eco-friendly" and "planet-positive." The other four samples are plain, specific and quietly confident. The guide follows the four because they match our values (honest, works, no guilt) and our readers, who roll their eyes at green-brand hype. The two pages are rewritten in section 5.

3. Tone by situation

Situation	Tone	Do	Avoid	Example line

Claude Opus 5.5

Find Your Brand Voice – Brand voice guide prompt for ChatGPT and Claude

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Claude Opus 5.5

This prompt builds a brand voice guide from your existing copy. Paste samples, your values and customers, and brands you like; you get voice traits, tone by situation, a word list, rewrites and a block for AI tools.

What you get

Three or four voice traits, each with what it is not and a line from your copy
Tone for 5 or 6 situations, from product pages to apologies, and a word list
Your three weakest lines rewritten, plus the claims in your copy that need proof
An instructions block to paste into any AI tool

How to use it

1
Paste the good and the bad
Include copy you are proud of and copy you dislike; the guide needs both to tell them apart.
2
Check each trait against your copy
Every trait quotes a line of yours. If it quotes one you dislike, say so and run it again.
3
Test the AI block
Save it in your AI tool's custom instructions, ask for a product description, and compare the draft with the guide.

Better results

Show the claims list to whoever checks legal or compliance before you change product pages.
After a month, paste new copy written from the guide and ask which rules writers are skipping.
Ask for a one-page version for freelancers: the traits, the word list and the three rewrites.

Questions

How do I create a brand voice with ChatGPT?

Paste real samples of your copy, your values, your customers and brands you admire, then ask for traits with examples, tone by situation and a word list. Base it on your best existing writing, so the guide describes a voice you already have.

What is a brand voice guide?

A brand voice guide is a short document that tells anyone writing for a business how it sounds: its traits, how tone changes by situation, words to use and avoid, and before and after examples. It keeps copy consistent across writers and AI tools.

How do I make AI write in my brand voice?

Give the AI a short block of instructions built from your own copy: your traits, words to avoid and example lines. Save it in custom instructions or a project. This prompt writes that block, under about 250 words, from your samples.

What is the difference between brand voice and tone?

Voice is your brand's personality and stays the same everywhere. Tone is how that voice adjusts to the moment: lighter on social posts, calmer in an apology. This prompt describes both, with a table of tone for each situation you write in.

Updated 8 Nov 2026