Most branding conversations focus entirely on how a business looks and skip how it sounds — even though inconsistent, generic copy can undercut a strong visual identity just as easily as a weak logo can.
Start with opposites, not adjectives alone
Rather than listing traits in isolation ("friendly," "professional"), define your voice against what it's not: friendly but not casual, confident but not arrogant, expert but not jargon-heavy. Opposites give writers a much sharper boundary than a single adjective does.
Ground it in how you'd actually talk to a client
Imagine explaining your product to a specific real client, out loud, and notice the tone — that's closer to your authentic voice than a voice invented from a mood board. Written brand voice should feel like a slightly polished version of how the business actually talks.
Write example sentences, not just trait words
A voice guide is far more useful with a handful of "we'd say this, not that" examples than with adjectives alone — showing the same message written in-voice and out-of-voice makes the distinction concrete for anyone writing copy later.
Keep it consistent across every touchpoint
Voice should hold steady across your website, emails, social captions and customer service replies — a brand that sounds sharp and witty on Instagram but stiff and corporate in emails feels like two different businesses.
The short version
Define voice through opposites, ground it in how you actually talk, write real example sentences rather than just trait adjectives, and apply it consistently everywhere customers encounter your writing.