Prompt: Rewrite Text in a Brand Voice

You are a copywriter adapting existing text into a specific brand voice.

Objective: Rewrite the passage below in {{BRAND NAME}}'s voice.

Context: The three voice traits that define this brand: {{VOICE TRAIT 1}}, {{VOICE TRAIT 2}}, {{VOICE TRAIT 3}}. A phrase or word this brand never uses: {{BANNED WORD OR PHRASE — or none}}.

Constraints:
- Do not change any fact, number or claim in the original passage — only tone and phrasing
- Apply all three named voice traits; after the rewrite, name which sentence demonstrates each one
- Do not use the banned word or phrase if one was given above
- Keep the rewrite within 20% of the original passage's word count, either direction

Output format: Return the rewritten passage first, then "Trait check:" with exactly three lines, one per trait, naming the sentence that demonstrates it.

Before finishing, check no fact or number has changed, all three voice traits are demonstrated and named, the banned phrase doesn't appear, and the word count is within 20% of the original.

Passage:
{{PASSAGE TO REWRITE}}

BRAND NAME: Fernglow Skincare
VOICE TRAIT 1: warm
VOICE TRAIT 2: plain-spoken, no jargon
VOICE TRAIT 3: quietly confident, not boastful
BANNED WORD OR PHRASE — or none: "revolutionary"
PASSAGE TO REWRITE:
  Our new serum utilizes a proprietary blend of active ingredients formulated to deliver visible results. Clinical testing was conducted with a panel of 40 participants over a six-week period. The product is suitable for most skin types.

Our new serum uses our own blend of active ingredients, made to give results you can see. We ran clinical testing with 40 people over six weeks. It suits most skin types, and hopefully yours too.

Trait check:
1. Warm: "It suits most skin types, and hopefully yours too" speaks directly to the reader rather than reciting a product spec.
2. Plain-spoken, no jargon: "Our new serum uses our own blend of active ingredients" replaces "utilizes a proprietary blend" with everyday words while keeping the same fact.
3. Quietly confident, not boastful: "We ran clinical testing with 40 people over six weeks" states the testing plainly, without dressing it up as a dramatic result.

Why the basic version fails

“Rewrite this in our brand voice” often changes more than tone — a number gets softened, a claim gets exaggerated, or a fact quietly drops out — because the model is optimising for how the passage sounds rather than checking it still says the same thing.

What this prompt fixes

Banning changes to facts or numbers keeps the rewrite honest to the source. Naming the sentence that demonstrates each trait turns a vague brand voice into something concrete and checkable, rather than a feeling the writer has to take on faith. The word-count band stops the rewrite drifting into padding or over-cutting.

Tips per model

• ChatGPT occasionally softens a specific number into a vaguer claim while rewriting for tone — check every figure survives unchanged.
• Claude tends to keep facts stable well here; if the trait check feels vague, ask it to quote the exact sentence rather than paraphrasing which one it means.
• Give three real, specific voice traits, not generic ones like “friendly” — the more specific the trait, the more checkable the rewrite becomes.