Most voice guides say "friendly, professional, human" and then sit unopened. A useful one is mostly examples, and it is written to settle specific arguments rather than to describe an aspiration.
Adjectives are not instructions
"Confident but approachable" cannot be acted on. Two writers will read it differently and both will believe they complied.
Replace every adjective with a rule and an example:
| Instead of | Write |
|---|---|
| Friendly | Use "you" and "we". Never "the customer" or "the company". |
| Clear | One idea per sentence. If a sentence has two commas, split it. |
| Confident | State the thing. Delete "we believe", "we think", "arguably". |
| Professional | No exclamation marks except in genuine congratulations. |
Before and after does the teaching
Six to ten real rewrites teach voice faster than any amount of description. Take actual sentences from your own site and show the corrected version beside them, with one line explaining what changed and why.
Pull the examples from the content people actually write most — captions, enquiry replies, product descriptions — not from a hypothetical manifesto nobody will ever produce.
Settle the recurring arguments
Every team has a handful of disputes that resurface monthly. Write the answers down once:
- Sentence case or title case in headings?
- Oxford comma or not?
- Numerals or words for one to nine?
- How do we write prices, dates and phone numbers?
- Which words do we never use? (Usually: "solutions", "leverage", "cutting-edge")
- How do we refer to the company — singular or plural?
This section will be consulted more than the rest of the document combined.
Voice bends by context
The same brand should not sound identical in a legal notice and a reply to a compliment. Give three or four contexts with a short worked example each: a social caption, a support reply, an error message, an apology.
The apology example is the one worth spending time on. It is the moment voice matters most and the moment teams most often default to corporate stiffness.
Keep it to a page or two
A forty-page voice document is a document nobody opens. Two pages of rules and examples, kept where people write rather than in a brand portal, will actually change output.
Voice sits alongside the visual system — see the brand guidelines checklist for the other half.
Frequently asked questions
Who should write the voice guide?
Whoever writes the most customer-facing copy, reviewed by whoever owns the brand. Written by committee, it turns into adjectives again.
How is voice different from tone?
Voice is constant — it is who you are. Tone shifts with the situation. The same brand can be warm in a congratulation and sober in an outage notice without changing voice.
Does this apply to AI-generated copy?
Especially. A voice guide with concrete rules and before-and-after examples is the most useful thing you can hand a model, and it is the difference between generic output and something that sounds like you.
