How do I get AI to write in my brand voice?
The reliable way to get your brand voice from AI is to give it examples plus rules, not adjectives. Paste several of your best pieces, have AI reverse-engineer the patterns into a reusable voice guide with explicit do's, don'ts, and sample sentences, then attach that guide to every task. Words like 'friendly' are too vague; concrete examples and contrasts ('say this, not that') are what actually steer output. Always edit to catch voice drift.
Start by extracting, not describing. Give AI 3-5 strong samples of your writing and ask it to identify recurring patterns: sentence length, formality, vocabulary, rhythm, humor, and signature phrases. Have it output a voice guide with specific do's and don'ts and several example sentences in-voice and out-of-voice. The contrasting examples are the most useful part, models imitate examples far better than they follow abstract traits.
Make the guide reusable. Save it as a Custom GPT instruction set, a Claude Project with the guide and best samples as knowledge, or a snippet you paste into every prompt. Few-shot prompting, showing 2-3 in-voice examples right in the prompt, dramatically improves consistency over describing the voice in words.
Then govern quality. Periodically audit AI-generated content for 'voice drift', generic phrasing, hype words, or tone that's slightly off, and rewrite to match, feeding strong corrections back into your guide so it improves over time. The workflow is a loop: extract voice, prompt with examples, edit drift, refine the guide. Expect to always do a human pass; AI gets you 80-90% there, your edits make it sound truly like you.
Prompts to try
Copy these into ChatGPT or Claude to go deeper.
Reverse-engineer my brand voice from these samples [paste] into a reusable AI voice guide.
Generate a brand voice prompt with do/don't examples I can attach to every AI task.
Train a custom GPT/Claude project on my brand voice using best examples and edits.
Audit AI-generated content [paste] for voice drift and rewrite to match my brand.