Marketing & Copy prompt
Best ChatGPT Prompt to Define Your Brand Voice and Tone
ChatGPTClaudeGemini
The short answer
Extracts a usable brand voice guide from your existing writing — traits, do/don't examples, word lists — so every writer and AI sounds like you. Copy the prompt below, replace the 7 [BRACKETED] variables with your own, and paste it into ChatGPT, Claude or Gemini.
You are a brand strategist and editor who creates practical brand voice guides that writers (and AI tools) can follow consistently.
CONTEXT
- Brand name and what it does: [BRAND_AND_PRODUCT]
- Target audience: [TARGET_AUDIENCE]
- Brand values or personality words we use internally: [VALUES_OR_PERSONALITY]
- Brands whose voice we admire, and why: [ADMIRED_BRANDS]
- Brands or styles we never want to sound like: [ANTI_EXAMPLES]
- Samples of our best existing writing (website copy, emails, posts — paste 3 to 5): [WRITING_SAMPLES]
TASK
1. Analyse the writing samples. Describe the voice as it actually is (sentence length, formality, humour, use of "we/you", jargon, punctuation habits), and note where samples are inconsistent.
2. Define 3 to 4 voice traits, each in the format "We are X, but not Y" (e.g. "Confident, but not arrogant"), with a one-paragraph explanation.
3. For each trait, give a do and don't example sentence.
4. Create a tone map: how the voice adapts across contexts (website, social, support replies, error messages, sales emails, bad news).
5. Build a word list: words and phrases we use, words we avoid, and preferred spellings or terms.
6. Write a short "voice prompt" (under 120 words) that can be pasted into an AI tool to make it write in this voice.
RULES
- Base the analysis on the samples, not on generic brand-speak. Quote short phrases from the samples as evidence.
- If samples are missing or too few, ask for them before proceeding.
- Keep the guide practical: every rule must change how someone writes a sentence.
THEN
Rewrite this sentence in the new voice for 3 different contexts (website, support reply, social post): [TEST_SENTENCE]
OUTPUT FORMAT
Headings: Current Voice Analysis / Voice Traits (with do/don't) / Tone Map (table) / Word List / AI Voice Prompt / Test Rewrites.What to fill in
Everything in [GOLD CAPS] is yours to replace. Leave one blank and the machine will guess — and the machine guesses like a meatbag on a Monday.
[BRAND_AND_PRODUCT][TARGET_AUDIENCE][VALUES_OR_PERSONALITY][ADMIRED_BRANDS][ANTI_EXAMPLES][WRITING_SAMPLES][TEST_SENTENCE]
How to use it
- Feed it your best writing, not your average writing. You are defining who you want to sound like, not documenting your worst Tuesday.
- The AI voice prompt at the end is the most-used part. Paste it at the top of every future writing prompt and your brand stops sounding like everyone else's robot.
- Choose a boring test sentence, like a shipping delay. Any brand can sound charming announcing a sale; voice is tested by bad news.
Example
BRAND_AND_PRODUCT: Fernbrook, refillable cleaning products
VALUES_OR_PERSONALITY: honest, playful, practical
ANTI_EXAMPLES: preachy eco brands, corporate legalese
TEST_SENTENCE: "Your order will arrive 3 days later than expected."Works with
Tested for ChatGPT, Claude, Gemini. Any modern chat model that follows long instructions will cope; the weaker ones will need you to restate the output format if they drift.
Weapons from the Arsenal that pair well with this prompt:
- ChatGPT — OpenAI's general-purpose assistant: writing, research, images, voice and agents in one chat box.
- Claude — Anthropic's assistant: the strongest long-form writer and careful reasoner in the consumer AI pack.
- Jasper — AI marketing content platform with brand voice controls and agents for marketing teams.