A small, focused website separate from a brand's main site, built around a single campaign, product, event, or audience — usually with a narrow purpose and sometimes its own domain.

When should you build a microsite?

When the purpose genuinely needs a separate space — distinct branding, an immersive experience that won't fit the main templates, or a reason the content shouldn't sit under the main domain. Otherwise a landing page or main-site campaign hub is usually better.

What are the downsides of a microsite?

It splits SEO authority away from the main domain, fragments analytics, adds maintenance, and risks becoming an orphaned, stale site after the campaign ends — which is why it should be used only when the separation earns those costs.

Growth Marketing Glossary

Microsite

mi·cro·sitenoun

A small, single-purpose site spun off from the main one — for a campaign, launch, or audience that needs its own focused space. Powerful when the purpose is real, wasteful when it isn't.

Schematic — a small focused site separate from the main one

Term: Microsite
Is: A small, focused site separate from the main one
Built for: A campaign, product, launch, or audience
Trade-off: Focus & freedom vs. split SEO and upkeep

Parts of speech & senses

microsite · noun

A small website, separate from a brand's main site, built around a single campaign, product, event, or audience — usually with a narrow purpose and sometimes its own domain. "They launched a microsite for the product reveal."

What a microsite is

A microsite is a small, self-contained website built for one focused purpose — a campaign, a product launch, an event, or a specific audience — kept separate from the brand's main site. It might live on its own domain or a subdomain, and typically has just a few pages designed around its single goal rather than the broad navigation of a full corporate site.

The appeal is focus and creative freedom. Freed from the main site's templates, navigation, and competing priorities, a microsite can deliver a tightly designed experience aimed at one outcome — an immersive launch, a campaign with its own look, an interactive tool, or a landing experience for a particular segment.

When a microsite makes sense — and when it doesn't

Microsites work when the purpose genuinely warrants a separate space: a major campaign that needs its own creative world, a product or event distinct enough that it would clutter the main site, an interactive experience that doesn't fit existing templates, or an audience that needs a dedicated journey. They falter when used by default — because every microsite carries real costs: it splits SEO authority away from the main domain (a separate site builds its own authority from scratch), fragments analytics and tracking, and adds maintenance and a site that can be orphaned and left to rot after the campaign ends.

Microsite vs. landing page vs. main-site section

The alternatives matter. A single landing page handles most focused-conversion needs without a whole separate site. A section or campaign hub on the main site keeps SEO authority and analytics consolidated while still giving a campaign room. A microsite is justified only when the purpose truly needs separation — distinct branding, an experience that can't live in the main templates, or a reason the content shouldn't sit under the main domain.

The discipline is to choose the lightest structure that serves the goal: a landing page or main-site hub by default, a microsite only when the separation earns its costs — and a plan for what happens to the microsite when the campaign ends, so it doesn't become an orphaned, unmaintained liability.

Worked example. A brand spins up a microsite for every campaign by habit, each on its own domain. Over a year it accumulates a graveyard of orphaned microsites — no longer promoted, slowly going stale, each having built (and then stranded) its own little pool of SEO authority separate from the main domain, with analytics scattered across them. Rethinking the pattern, the brand defaults to campaign hubs and landing pages on its main site — consolidating SEO authority and tracking — and reserves a true microsite only for the rare campaign that genuinely needs its own creative world, with an end-of-life plan attached. Authority concentrates, upkeep drops, and the focused separate site is used only where it earns its cost. The lesson: a microsite is powerful for a genuinely separate purpose, but used by default it splits SEO, fragments data, and breeds orphaned pages. (Illustrative; RGM analysis.)

Failure modes to watch. Building a microsite by default when a landing page or main-site hub would do; splitting SEO authority away from the main domain unnecessarily; fragmenting analytics across separate sites; orphaning microsites after a campaign ends (stale, unmaintained liabilities); and underestimating the cost of building and maintaining a separate site.

Synonyms & antonyms

Synonyms

campaign sitestandalone site

Antonyms

main sitelanding pagecampaign hub

Origin & history

"Microsite" combines 'micro' (small) with 'site', emerging in the late 1990s as brands built small standalone sites for campaigns and products distinct from their growing corporate sites. The trade-off with SEO consolidation has shaped best practice ever since.

Etymology: source.

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

What is a microsite?: A small, focused website separate from a brand's main site, built around a single campaign, product, event, or audience — usually with a narrow purpose and sometimes its own domain.
When should you build a microsite?: When the purpose genuinely needs a separate space — distinct branding, an immersive experience that won't fit the main templates, or a reason the content shouldn't sit under the main domain. Otherwise a landing page or main-site campaign hub is usually better.
What are the downsides of a microsite?: It splits SEO authority away from the main domain, fragments analytics, adds maintenance, and risks becoming an orphaned, stale site after the campaign ends — which is why it should be used only when the separation earns those costs.

Resources & people to follow

referenceRGM analysis — definitions, senses, and usage verified per term

Curated, non-competitor resources verified per term.

Related training

moduleGrowth marketing foundations

Disciplines

Areas of marketing where microsite is a core concern:

Growth strategyPerformance marketing

Sources

trendsGoogle Trends — "microsite"