Lesson 6. Tone of voice and brand voice
AI writes fast but doesn't guess brand voice on its own. If you don't set the style, acceptable vocabulary, and stop-words directly in the prompt, you'll get different-sounding text every time.
Topic breakdown
Brand voice isn't just 'friendly' or 'formal'. It includes sentence length, form of address, acceptable expressions, level of directness, and distance with the user.
If you don't put these rules into the prompt, the model easily drifts into either overly promotional or too dry and cold style. For a brand, this destroys recognizability.
This is especially important in a team: when multiple employees use AI, it's the prompt system that should maintain a consistent tone across all texts.
What you'll learn
- embed brand voice into prompts
- set recommended and prohibited expressions
- achieve repeatable style
- adapt tone for channel without losing the brand core
Lesson plan
What brand voice consists of
It's a combination of sentence length, form of address, vocabulary, acceptable directness, text pace, and overall mood.
Recommended and prohibited expressions
If the model knows which words suit the brand and which don't, results become noticeably more consistent.
Adapting for different channels
A social post, a hero block on a landing page, and a support response differ in form but should remain recognizably 'one brand'.
Team usage
Fixed tone of voice rules are especially important when AI is used by multiple employees and a unified standard is needed.
Weak vs strong prompt
Write a post in our brand style.
Brand tone: simple, confident, no excess promotion. Address: formal 'you'. Sentences short. Recommended phrases: 'clear benefit', 'easy start', 'quick response'. Prohibited: 'the best', 'hurry', 'super sale'. Write a social media post about a new service in this style and end with a soft CTA.
The strong prompt doesn't leave tone of voice abstract: it sets the form of address, vocabulary, restrictions, and channel. So the text is closer to the real brand.
Ready prompt template
Copy and adaptBrand voice: simple, confident, benefit-oriented. Sentences are short. Address: formal 'you'. Recommended phrases: [list]. Prohibited phrases: [list]. Do not use overly promotional, artificial, or clickbait tone. Complete the task [task] in this style. At the end, briefly check how well the text follows the tone of voice rules.
Why it works
Brand tone is best placed in a separate layer of the prompt, not hidden between task and format.
Recommended phrases guide the model's language, while restrictions cut off undesirable stylistic signals.
Sentence length and form of address are also part of brand voice, not just the general mood.
When changing channels, the brand core stays the same — only micro-parameters change: length, text density, and degree of softness.
Practice
- Collect 5 recommended phrases for your brand.
- Then write down 5 phrases the brand avoids.
- Create one prompt for a social media post and one for a support response.
- Compare results and check whether the overall brand voice was maintained.
Mini-project
Mini-project: brand voice map
Build a short brand voice card and apply it in different prompts to achieve consistent style across multiple channels.
Tasks
- Describe 3 key properties of the brand voice.
- Collect 5 recommended and 5 prohibited phrases.
- Create a prompt for a social post and a support response.
- Check whether the brand voice matches in both results.
Deliverables
- 1 brand voice map
- 2 prompt templates
- 2 AI results and brief analysis
Checklist
Common mistakes
- describing the tone too generically
- requesting style without examples or rules
- completely changing brand voice for each channel
- not setting stop-words and undesirable patterns
Lesson FAQ
Are examples needed for tone of voice?
Not always, but good examples significantly speed up result stabilization. For team work they're especially useful as a reference.
Does each channel need a different tone?
The base brand voice stays the same. Only length, format, and softness of delivery change for a specific channel.