# Banner

> A full-width message at the top of a page or app, for conditions affecting everything below it.

- Category: UI Components
- Canonical: https://www.themasterly.com/glossary/banner-ui

A banner is a full-width message at the top of a page or application, used for conditions that affect everything below it. An expired card. A degraded integration. A plan limit reached. Scheduled maintenance tonight.

Its width is the signal. A message spanning the whole interface is claiming to be about the whole interface, and that claim should be true — which is the distinction from an [alert](https://www.themasterly.com/glossary/alert-ui), placed where its condition applies.

## What belongs in one

**Account-level conditions.** Billing problems, expired credentials, limits reached. These affect every screen, so they belong above every screen.

**Service-level conditions.** Degraded performance, an integration that is down, read-only mode during maintenance. See [status indicator](https://www.themasterly.com/glossary/status-indicator).

**Time-bounded announcements.** Maintenance tonight, a deprecation in thirty days, a migration this weekend. Dismissible, and they should stay dismissed.

**Environment markers.** A staging or impersonation banner, which is one of the genuinely important uses: somebody acting as another user needs a permanent, unmissable reminder that they are doing so.

What does not belong: anything about one screen, anything about one record, anything that is really marketing, and anything that has been there for six months.

## The cost nobody counts

A permanent banner charges twice.

**Vertical space on every screen, forever.** In a dense B2B tool that is a real loss, and it compounds on laptops.

**Blindness to the region.** This is the larger cost and the invisible one. A product with a promotional banner up for three months has trained its users not to look at the top of the page. When the billing failure appears there, it is in a place people have learned to skip.

That is the argument against using the banner slot for anything non-urgent. It is not that a promotion is offensive; it is that it spends the attention the urgent message will need later.

## Rules that keep it usable

**One at a time.** Two stacked banners push the application down and neither is read. Where several conditions are live, show the most severe with a link to the rest.

**Dismissible only if dismissing resolves it.** An expired card that can be closed is a product that will silently refuse payments for the rest of the session.

**Dismissed should stay dismissed.** An announcement that returns on every page load is worse than one that was never dismissible, because it teaches that the close control does nothing.

**Action inline.** A banner about billing should carry the button that fixes it, not an instruction to go to Settings.

**Severity visible without colour.** Banners are frequently the first thing in a screenshot, and screenshots lose nothing more often than they lose colour meaning.

**Do not push content on load.** A banner that appears after the page has rendered shifts everything down under the reader's cursor. Reserve the space or render it with the page.

## In B2B

**Impersonation and environment banners are worth the space.** Support staff acting as a customer, or anybody on a staging environment, need a permanent visual difference. This is the case where an unmissable, undismissable banner is exactly right.

**Account-wide limits need to reach the person who can act.** A banner about a seat limit shown only to admins leaves everyone else confused about why invitations fail. Show the condition to everyone; show the action to whoever has it.

**Multi-tenant products need to say which tenant.** A banner about a workspace should name it, because people work across several.

## In practice

A product runs a banner announcing a new feature. It performs well, so it stays up.

Four months later a billing integration fails and the product shows a banner about it. Support volume about failed payments rises anyway, and when customers are asked, most say they never saw a message.

They had seen it. The top strip had been a marketing surface for a third of a year, and people had stopped reading it — which is exactly what it had taught them to do.

The repair is a policy rather than a component change: the banner slot carries conditions, not announcements, and announcements move to a place that does not spend the attention conditions will need.

## Where teams get it wrong

- **A permanent promotional banner.** Spending the attention the urgent message will need.
- **Two at once.** The product pushed down, neither read.
- **Dismissible for a live condition.** Closed, and then inexplicable.
- **A dismissal that does not persist.** Teaching that the close control is decorative.
- **Instructions instead of a control.** The fix, one navigation away.
- **Appearing after load.** Content shifting under the reader.

## Related terms

- [Alert UI](https://www.themasterly.com/glossary/alert-ui)
- [Status Indicator](https://www.themasterly.com/glossary/status-indicator)
- [Toast Notification](https://www.themasterly.com/glossary/toast-notification)
- [UI Design](https://www.themasterly.com/glossary/ui-design)

## FAQ

**What is a banner in UI design?**

A full-width message spanning the top of the page or the application, used for conditions that affect everything below it: an expired card, a degraded service, a plan limit reached, scheduled maintenance. Its width is what makes it global rather than local.

**When should you use a banner instead of an alert?**

When the condition applies to the whole account or the whole application rather than to one screen or one field. An alert about a record belongs on the record. A banner about billing belongs above everything, because every screen is affected by it.

**Should banners be dismissible?**

Only if the condition genuinely ends when dismissed. Announcements and promotions should be dismissible and should stay dismissed. Conditions — an expired card, a failed integration — should not be, because a dismissed banner means the product misbehaves for the rest of the session with nothing explaining why.

**How many banners can be shown at once?**

One. Two stacked banners push the product down the page and neither gets read. Where several conditions are live, show the most severe and make the others reachable, or consolidate them into one message with a link to the details.

**Do banners hurt usability?**

A permanent banner for a non-urgent message does, in two ways: it takes vertical space on every screen forever, and it trains people to ignore the region where the urgent messages will later appear. That second cost is the larger one and it is invisible until it matters.

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