diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 8dc1669..adc3b55 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -25,6 +25,9 @@ jobs:
       - name: Build
         run: hugo --buildFuture --minify
 
+      - name: Build search index
+        run: npx --yes pagefind@1.5.2 --site public
+
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v4
         if: github.ref == 'refs/heads/main'
diff --git a/.prettierrc.cjs b/.prettierrc.cjs
index 1085a96..1c2ef06 100644
--- a/.prettierrc.cjs
+++ b/.prettierrc.cjs
@@ -7,7 +7,7 @@ module.exports = {
     plugins: [require.resolve("prettier-plugin-go-template")],
     overrides: [
         {
-            files: ["*.html"],
+            files: ["*.html", "layouts/**/*.json"],
             options: {
                 parser: "go-template",
             },
diff --git a/README.md b/README.md
index 4460cee..dd64748 100644
--- a/README.md
+++ b/README.md
@@ -24,5 +24,12 @@ Look inside [`/layout`](/layout) for that. [Hugo Templating](https://gohugo.io/t
 To build the website (with hot reload), [install Hugo](https://gohugo.io/getting-started/installing/) and run
 
 ```sh
-hugo server --buildFuture -D
+hugo server -D
+```
+
+Site search is powered by [Pagefind](https://pagefind.app/), which indexes the built HTML rather than the content files, so `hugo server` alone has no index and the search dialog will say so.
+To try it locally, build and index the site, then serve `public/`:
+
+```sh
+hugo && npx pagefind --site public && python3 -m http.server -d public
 ```
diff --git a/assets/main.scss b/assets/main.scss
index be29950..4faf62d 100644
--- a/assets/main.scss
+++ b/assets/main.scss
@@ -514,8 +514,12 @@ body {
                         }
                     }
                 }
+                // The wide gap under the hero used to live on #packages, which put it
+                // between whatever section came after the demo and the packages.
+                #interactive-demo-section {
+                    margin-bottom: 15%;
+                }
                 #packages {
-                    margin-top: 15%;
                     #packages-list {
                         .card {
                             display: flex;
@@ -2547,7 +2551,6 @@ $eco-hues:
 // Interactive UMAP Visualization Styles
 #interactive-demo-section {
     margin-top: 8%;
-    margin-bottom: 5%;
 }
 
 .interactive-container {
@@ -2781,3 +2784,164 @@ $eco-hues:
 .page-item-author {
     font-weight: 600;
 }
+
+// ---- Global search ------------------------------------------------------
+
+.nav-search-button {
+    display: flex;
+    align-items: center;
+    gap: 0.4rem;
+    background: none;
+    border: 0;
+    color: $greyheader;
+    font-size: inherit;
+
+    &:hover {
+        color: $greyheaderhover;
+    }
+
+    .nav-search-kbd {
+        padding: 0.05rem 0.4rem;
+        border: 1px solid $tilebg2;
+        border-radius: 0.25rem;
+        background-color: $tilebg4;
+        color: $greydesc;
+        font-size: 0.75rem;
+        line-height: 1.2;
+
+        @media (max-width: 62rem) {
+            display: none;
+        }
+    }
+}
+
+.search-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 1080;
+    display: flex;
+    justify-content: center;
+    padding: 4rem 1rem 1rem;
+    background-color: rgba(0, 0, 0, 0.45);
+
+    &[hidden] {
+        display: none;
+    }
+
+    @media (max-width: 50rem) {
+        padding: 1rem 0.5rem;
+    }
+}
+
+.search-dialog {
+    display: flex;
+    flex-direction: column;
+    width: 100%;
+    max-width: 42rem;
+    max-height: 100%;
+    overflow: hidden;
+    border-radius: 0.75rem;
+    background-color: white;
+    box-shadow: 0 1.5rem 3rem rgba(0, 0, 0, 0.3);
+}
+
+.search-field {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    padding: 1rem 1.25rem;
+    border-bottom: 1px solid $tilebg;
+    color: $greydesc;
+}
+
+.search-input {
+    flex: 1;
+    border: 0;
+    outline: none;
+    font-size: 1.15rem;
+    color: $tiletext;
+
+    &::-webkit-search-cancel-button {
+        display: none;
+    }
+}
+
+.search-close {
+    padding: 0.1rem 0.45rem;
+    border: 1px solid $tilebg2;
+    border-radius: 0.25rem;
+    background-color: $tilebg4;
+    color: $greydesc;
+    font-size: 0.8rem;
+}
+
+.search-status {
+    margin: 0;
+    padding: 0.6rem 1.25rem;
+    color: $greydesc;
+    font-size: 0.9rem;
+
+    &:empty {
+        display: none;
+    }
+}
+
+.search-results {
+    margin: 0;
+    padding: 0 0 0.5rem;
+    overflow-y: auto;
+    list-style: none;
+
+    a {
+        display: block;
+        padding: 0.75rem 1.25rem;
+        color: inherit;
+        text-decoration: none;
+
+        &:hover,
+        &:focus-visible,
+        &[aria-selected="true"] {
+            background-color: $tilebg4;
+            outline: none;
+        }
+    }
+
+    .search-result-title {
+        color: $tiletext;
+        font-weight: 600;
+    }
+
+    .search-result-url {
+        color: $mudatagreen;
+        font-size: 0.8rem;
+    }
+
+    .search-result-kind {
+        padding: 0.05rem 0.4rem;
+        border-radius: 0.25rem;
+        background-color: rgba($scviyellow, 0.25);
+        color: $tiletext2;
+        font-size: 0.75rem;
+        white-space: nowrap;
+    }
+
+    .search-result-entity .search-result-title::after {
+        content: " ↗";
+        color: $greydesc;
+        font-weight: 400;
+    }
+
+    .search-result-excerpt {
+        display: block;
+        margin-top: 0.15rem;
+        color: $greydesc;
+        font-size: 0.9rem;
+        line-height: 1.35rem;
+
+        mark {
+            padding: 0;
+            background-color: rgba($scviyellow, 0.35);
+            color: inherit;
+        }
+    }
+}
diff --git a/config.toml b/config.toml
index 434cfdc..b1912d0 100644
--- a/config.toml
+++ b/config.toml
@@ -12,6 +12,15 @@ enableRobotsTXT = true
 images = ["img/scverse-social-card.png"]
 description = "Foundational tools for omics data in the life sciences"
 
+[outputs]
+home = ["html", "rss", "entities"]
+
+[outputFormats.entities]
+mediaType = "application/json"
+baseName = "search-entities"
+isPlainText = true
+notAlternative = true
+
 [markup.goldmark.renderer]
 unsafe= true
 
diff --git a/layouts/index.entities.json b/layouts/index.entities.json
new file mode 100644
index 0000000..6c4d813
--- /dev/null
+++ b/layouts/index.entities.json
@@ -0,0 +1,65 @@
+{{- $entities := slice -}}
+
+{{- with site.GetPage "/packages" -}}
+    {{- range (append (.Params.packages | default slice) (.Params.datastructures | default slice)) -}}
+        {{- $docs := .url -}}
+        {{- range .links -}}
+            {{- if hasPrefix (lower .text) "documentation" -}}
+                {{- $docs = .url -}}
+            {{- end -}}
+        {{- end -}}
+        {{- $entities = $entities | append (dict
+            "kind" "Core package"
+            "name" .name
+            "detail" .description
+            "url" $docs
+            "site" "/packages/#core-packages")
+        -}}
+    {{- end -}}
+{{- end -}}
+
+{{- $registry := resources.GetRemote "https://scverse.org/ecosystem-packages/packages.json" -}}
+{{- with $registry -}}
+    {{- range (transform.Unmarshal .Content) -}}
+        {{- $desc := trim (.description | markdownify | plainify | htmlUnescape | replaceRE `\s+` " ") " " -}}
+        {{- $entities = $entities | append (dict
+            "kind" "Ecosystem package"
+            "name" .name
+            "detail" $desc
+            "url" (or .documentation_home .project_home)
+            "site" "/packages/#ecosystem")
+        -}}
+    {{- end -}}
+{{- end -}}
+
+{{- with site.GetPage "/people" -}}
+    {{- range .Params.teams -}}
+        {{- $team := .name -}}
+        {{- range .members -}}
+            {{- $detail := $team -}}
+            {{- with .role -}}{{- $detail = printf "%s · %s" $team . -}}{{- end -}}
+            {{- with .affiliation -}}
+                {{- $detail = printf "%s · %s" $detail . -}}
+            {{- end -}}
+            {{- $entities = $entities | append (dict
+                "kind" $team
+                "name" .name
+                "detail" $detail
+                "url" .url
+                "site" "/people/")
+            -}}
+        {{- end -}}
+    {{- end -}}
+{{- end -}}
+
+{{- /* The registry repeats the core packages and people sit on several teams. */ -}}
+{{- $seen := slice -}}
+{{- $unique := slice -}}
+{{- range $entities -}}
+    {{- $key := lower .name -}}
+    {{- if not (in $seen $key) -}}
+        {{- $seen = $seen | append $key -}}
+        {{- $unique = $unique | append . -}}
+    {{- end -}}
+{{- end -}}
+{{- $unique | jsonify -}}
diff --git a/layouts/partials/footer.html b/layouts/partials/footer.html
index feff8d0..d454093 100644
--- a/layouts/partials/footer.html
+++ b/layouts/partials/footer.html
@@ -1,4 +1,4 @@
-<footer>
+<footer data-pagefind-ignore>
   <div id="footer-content" class="container">
     <div class="row">
       <div class="col-12 col-md-6 col-lg-3">
diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 0356135..0a016b7 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -1,4 +1,4 @@
-<div class="container" style="max-width: 1200px;">
+<div class="container" style="max-width: 1200px;" data-pagefind-ignore>
   <nav class="navbar navbar-expand-lg navbar-light">
     <div class="container-fluid" style="padding: 0;">
       <a class="navbar-brand row align-items-center m-0" href="/">
@@ -136,6 +136,13 @@
               >Conference</a
             >
           </li>
+          <li class="nav-item">
+            <button type="button" class="nav-link nav-search-button" id="search-open" aria-label="Search this site">
+              <i class="bi bi-search" aria-hidden="true"></i>
+              <span class="nav-search-label">Search</span>
+              <kbd class="nav-search-kbd" aria-hidden="true">/</kbd>
+            </button>
+          </li>
           <li class="nav-item">
             <a id="join-button" class="nav-link nav-button-hl" href="/join">Join</a>
           </li>
@@ -144,3 +151,25 @@
     </div>
   </nav>
 </div>
+
+<div class="search-overlay" id="search-overlay" hidden>
+  <div class="search-dialog" role="dialog" aria-modal="true" aria-labelledby="search-label" id="search-dialog">
+    <label class="visually-hidden" for="search-input" id="search-label">Search scverse.org</label>
+    <div class="search-field">
+      <i class="bi bi-search" aria-hidden="true"></i>
+      <input
+        type="search"
+        id="search-input"
+        class="search-input"
+        placeholder="Search packages, tutorials, events, blog posts…"
+        autocomplete="off"
+        spellcheck="false"
+        aria-describedby="search-status"
+        aria-controls="search-results"
+      />
+      <button type="button" class="search-close" id="search-close" aria-label="Close search">Esc</button>
+    </div>
+    <p class="search-status" id="search-status" role="status" aria-live="polite"></p>
+    <ul class="search-results" id="search-results"></ul>
+  </div>
+</div>
diff --git a/netlify.toml b/netlify.toml
index d16d066..a013f44 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -1,4 +1,9 @@
 # Deploy previews used to build with Netlify's default Hugo (0.97.2, from 2022), so they did not reflect what gets published: .github/workflows/gh-pages.yml builds with `latest`, which currently resolves to 0.164.0.
 # Pin previews to that, and bump both together from here on.
+[build]
+# Netlify's Hugo preset stops at `hugo`; the search index is built after it.
+command = "hugo --buildFuture --minify && npx --yes pagefind@1.5.2 --site public"
+publish = "public"
+
 [build.environment]
 HUGO_VERSION = "0.164.0"
diff --git a/static/main.js b/static/main.js
index e2aee8d..d0ff8d2 100644
--- a/static/main.js
+++ b/static/main.js
@@ -381,6 +381,227 @@ const initInteractiveViz = () => {
   });
 }
 
+
+function initSearch() {
+  const openButton = document.getElementById('search-open')
+  const overlay = document.getElementById('search-overlay')
+  const dialog = document.getElementById('search-dialog')
+  const input = document.getElementById('search-input')
+  const status = document.getElementById('search-status')
+  const results = document.getElementById('search-results')
+  const closeButton = document.getElementById('search-close')
+  if (!openButton || !overlay) return
+
+  let pagefindPromise = null
+  let lastQuery = ''
+  let selected = -1
+  let debounce
+
+  let entitiesPromise = null
+
+  function loadEntities() {
+    if (!entitiesPromise) {
+      entitiesPromise = fetch('/search-entities.json')
+        .then(response => response.json())
+        .catch(() => [])
+    }
+    return entitiesPromise
+  }
+
+  function matchEntities(entities, query) {
+    const terms = normalise(query)
+    if (!terms.length) return []
+    return entities
+      .map(entity => {
+        const name = entity.name.toLowerCase()
+        const words = normalise(entity.name)
+        let rank = -1
+        if (name === query.toLowerCase()) rank = 0
+        else if (name.startsWith(query.toLowerCase())) rank = 1
+        else if (terms.every(term => words.some(word => word.startsWith(term)))) rank = 2
+        return { entity, rank }
+      })
+      .filter(scored => scored.rank >= 0)
+      .sort((a, b) => a.rank - b.rank || a.entity.name.length - b.entity.name.length)
+      .slice(0, 3)
+      .map(scored => scored.entity)
+  }
+
+  // Memoises the promise, not the module: two concurrent init() calls never resolve.
+  function loadPagefind() {
+    if (!pagefindPromise) {
+      pagefindPromise = (async () => {
+        const engine = await import('/pagefind/pagefind.js')
+        await engine.options({ excerptLength: 25 })
+        await engine.init()
+        return engine
+      })().catch(() => {
+        // The index is written after `hugo` by `npx pagefind`.
+        status.textContent = 'Search index unavailable. Run `npx pagefind --site public` after building.'
+        return null
+      })
+    }
+    return pagefindPromise
+  }
+
+  function open() {
+    overlay.hidden = false
+    document.body.style.overflow = 'hidden'
+    input.focus()
+    input.select()
+    loadPagefind()
+  }
+
+  function close() {
+    overlay.hidden = true
+    document.body.style.overflow = ''
+    openButton.focus()
+  }
+
+  function setSelected(next) {
+    const items = results.querySelectorAll('a')
+    if (!items.length) return
+    if (selected >= 0 && items[selected]) items[selected].removeAttribute('aria-selected')
+    selected = (next + items.length) % items.length
+    items[selected].setAttribute('aria-selected', 'true')
+    items[selected].scrollIntoView({ block: 'nearest' })
+  }
+
+  // Pagefind matches when an indexed word is a prefix of the search term, so
+  // "xylophone" comes back matching "x" on seventeen pages.
+  function relevant(hit) {
+    const terms = normalise(lastQuery)
+    if (!terms.length) return true
+    const matched = [...hit.excerpt.matchAll(/<mark>(.*?)<\/mark>/g)].flatMap(m => normalise(m[1]))
+    return terms.some(term => matched.some(word => word.startsWith(term)))
+  }
+
+  // Both sides must be split the same way, or "rapids-singlecell" fails to match itself.
+  function normalise(text) {
+    return text
+      .toLowerCase()
+      .split(/[^a-z0-9]+/)
+      .filter(word => word.length > 1)
+  }
+
+  async function render(query) {
+    if (query === lastQuery) return
+    lastQuery = query
+    selected = -1
+
+    if (query.length < 2) {
+      results.innerHTML = ''
+      status.textContent = ''
+      return
+    }
+
+    const pinned = matchEntities(await loadEntities(), query)
+    if (query !== lastQuery) return
+
+    const engine = await loadPagefind()
+    if (!engine) return
+
+    status.textContent = 'Searching…'
+    const search = await engine.search(query)
+    if (query !== lastQuery) return
+
+    const candidates = await Promise.all(search.results.slice(0, 30).map(result => result.data()))
+    if (query !== lastQuery) return
+
+    const top = candidates.filter(relevant).slice(0, 12)
+
+    results.innerHTML = ''
+    if (!top.length && !pinned.length) {
+      status.textContent = `No results for “${query}”`
+      return
+    }
+    const total = top.length + pinned.length
+    status.textContent = `${total} result${total === 1 ? '' : 's'}`
+
+    pinned.forEach(entity => {
+      const item = document.createElement('li')
+      const link = document.createElement('a')
+      link.href = entity.url
+      link.target = '_blank'
+      link.rel = 'noopener'
+      link.className = 'search-result-entity'
+      link.innerHTML =
+        '<span class="search-result-title"></span> <span class="search-result-kind"></span>' +
+        '<span class="search-result-excerpt"></span>'
+      link.querySelector('.search-result-title').textContent = entity.name
+      link.querySelector('.search-result-kind').textContent = entity.kind
+      link.querySelector('.search-result-excerpt').textContent = entity.detail
+      item.appendChild(link)
+      results.appendChild(item)
+    })
+
+    top.forEach(hit => {
+      const item = document.createElement('li')
+      const link = document.createElement('a')
+      link.href = hit.url
+      link.innerHTML =
+        '<span class="search-result-title"></span> <span class="search-result-url"></span>' +
+        '<span class="search-result-excerpt"></span>'
+      link.querySelector('.search-result-title').textContent = hit.meta.title || hit.url
+      link.querySelector('.search-result-url').textContent = hit.url
+      link.querySelector('.search-result-excerpt').innerHTML = hit.excerpt
+      item.appendChild(link)
+      results.appendChild(item)
+    })
+  }
+
+  openButton.addEventListener('click', open)
+  closeButton.addEventListener('click', close)
+
+  overlay.addEventListener('mousedown', event => {
+    if (!dialog.contains(event.target)) close()
+  })
+
+  input.addEventListener('input', () => {
+    clearTimeout(debounce)
+    debounce = setTimeout(() => render(input.value.trim()), 150)
+  })
+
+  dialog.addEventListener('keydown', event => {
+    if (event.key === 'ArrowDown') {
+      event.preventDefault()
+      setSelected(selected + 1)
+    } else if (event.key === 'ArrowUp') {
+      event.preventDefault()
+      setSelected(selected - 1)
+    } else if (event.key === 'Enter') {
+      const items = results.querySelectorAll('a')
+      if (selected >= 0 && items[selected]) {
+        event.preventDefault()
+        items[selected].click()
+      }
+    } else if (event.key === 'Tab') {
+      // Keep focus inside the dialog while it is open.
+      const focusable = dialog.querySelectorAll('input, button, a')
+      const first = focusable[0]
+      const last = focusable[focusable.length - 1]
+      if (event.shiftKey && document.activeElement === first) {
+        event.preventDefault()
+        last.focus()
+      } else if (!event.shiftKey && document.activeElement === last) {
+        event.preventDefault()
+        first.focus()
+      }
+    }
+  })
+
+  document.addEventListener('keydown', event => {
+    if (event.key === 'Escape' && !overlay.hidden) {
+      close()
+    } else if (overlay.hidden && (event.key === '/' || ((event.metaKey || event.ctrlKey) && event.key === 'k'))) {
+      const tag = document.activeElement && document.activeElement.tagName
+      if (tag === 'INPUT' || tag === 'TEXTAREA') return
+      event.preventDefault()
+      open()
+    }
+  })
+}
+
 // Initialize everything when DOM is loaded
 document.addEventListener('DOMContentLoaded', function() {
   initEcosystemRegistry()
@@ -392,6 +613,8 @@ document.addEventListener('DOMContentLoaded', function() {
 
   initTableOfContents()
 
+  initSearch()
+
   // Initialize interactive visualization if on home page
   initInteractiveViz()
 })