A bio is the short description at the top of a social media profile that tells visitors who an account belongs to, what it offers and what to do next. It sits under the profile name and photo, and it is often the first thing someone reads after tapping through to your account from a post, an ad or a search.
How a bio works
Each platform gives you a small, fixed space. At the time of writing (October 2026), Instagram allows 150 characters, TikTok 80 and X 160. LinkedIn splits it into a headline under your name and a longer About section, and Facebook Pages have a short intro plus fuller details. Around the text, most platforms add structured fields: a category, contact buttons, an address, opening hours and one or more links.
A good bio does three jobs in a few seconds:
- Says who you are. What you do and, for local firms, where. “Wedding florist, Richmond and south-west London” says far more than “Flowers with love”.
- Shows you are genuine. A recognisable logo or face, a consistent handle, and details that match your website and Google Business Profile.
- Points to one action. Book, call, shop or enquire, usually through the link in bio.
The text is also searchable. Instagram and TikTok search draw on profile names, usernames and bio text, so the words you choose affect whether you appear when someone searches “dog groomer Leeds” inside the app. That makes the bio part of social SEO.
Why it matters
People decide quickly. Someone who sees a good Reel or an ad and taps through to your profile is checking two things: is this for me, and can I trust it? A vague bio, an out-of-date link or a broken booking page loses them at the moment they were most interested.
For paid social this matters more than many advertisers realise. Some people who see an Instagram ad visit the profile rather than clicking the ad’s link, so the bio works as a second landing page you are paying to send traffic to. For a UK local business, it is also one more place where your name, area and phone number should match everything else online.
Common mistakes
- Slogans instead of facts. “Passionate about excellence” tells nobody what you sell or where.
- No location for a business that only serves one area.
- No clear next step, or several competing ones.
- Dead or generic links, such as the home page when the bio promises a booking form.
- Stuffing in keywords. A string of search terms reads as spam and helps little.
- Inconsistent details across platforms: different names, an old phone number, an address you have moved from.
- Never updating it when offers, opening hours or services change.
How to act on it
Write the bio as one or two plain sentences: what you do, for whom and where. Where the platform allows, put your main search phrase in the profile name field as well, such as your business name followed by “Plumber in Croydon”. Instagram limits how often the name can be changed, so settle on the wording before you edit it.
Finish with a single call to action and a link that goes exactly where that action happens: the booking page, the shop category or the enquiry form. Tag the link with UTM parameters, using a tool such as my UTM link builder, so the visits show up clearly in GA4. Fill in every structured field the platform offers, including category, contact buttons and address if customers come to you.
Then check it on a phone, as a stranger would: read it in a few seconds, tap the link and try the contact buttons. If ads will send people to the profile, review the bio before each campaign; I treat it as part of the funnel when setting up Instagram ad campaigns.