diff --git a/_quarto.yml b/_quarto.yml
index 31bac75..3d4a444 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -5,10 +5,18 @@ project:
     - "*.qmd"
     - "site/**/*.qmd"
     - "blog/**/*.qmd"
+  post-render:
+    - scripts/fix-sitemap.sh
 website:
   title: COMPUTO
-  site-url: https://computo-journal.org/
+  site-url: https://computo-journal.org
   description: A platform for computational research and reproducibility
+  image: /assets/img/og-image.png
+  image-alt: "Computo, a journal of the French Statistical Society"
+  open-graph:
+    locale: en_US
+  twitter-card:
+    card-style: summary_large_image
   favicon: assets/favicon.ico
   navbar:
     background: primary
@@ -52,6 +60,7 @@ format:
     theme:
       light: [ custom.scss, light.scss ]
       dark: [ custom.scss, dark.scss ]
+    canonical-url: true
     toc: true
     code-copy: true
     code-block-border-left: true
diff --git a/assets/img/og-image.png b/assets/img/og-image.png
new file mode 100644
index 0000000..6fc3d61
Binary files /dev/null and b/assets/img/og-image.png differ
diff --git a/assets/img/og-image.svg b/assets/img/og-image.svg
new file mode 100644
index 0000000..1017992
--- /dev/null
+++ b/assets/img/og-image.svg
@@ -0,0 +1,112 @@
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+   sodipodi:docname="og-image.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
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+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="0.42331174"
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+     inkscape:cy="303.55879"
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+     inkscape:window-height="936"
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+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
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+     id="defs1">
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diff --git a/index.qmd b/index.qmd
index 9f1db3c..8eb62e2 100644
--- a/index.qmd
+++ b/index.qmd
@@ -1,7 +1,10 @@
 ---
-description: <h1>COMPUTO</h1> A journal of the <a href="https://sfds.asso.fr/">French
-  Statistical Society <img height="10px" src="assets/img/sfds.png" alt="SFdS"/></a>
-  - ISSN 2824-7795
+description: >-
+  Computo is an open-access journal of the French Statistical Society publishing
+  reproducible computational and algorithmic contributions in statistics and
+  machine learning.
+image: assets/img/og-image.png
+image-alt: "Computo, a journal of the French Statistical Society"
 page-layout: full
 toc: false
 listing:
diff --git a/scripts/fix-sitemap.sh b/scripts/fix-sitemap.sh
new file mode 100755
index 0000000..0e2fdd3
--- /dev/null
+++ b/scripts/fix-sitemap.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Quarto emits sitemap <loc> entries ending in /index.html, while pages'
+# rel="canonical" tags point at the trailing-slash form. Google Search Console
+# then flags the sitemap URLs as duplicates with no chosen canonical.
+# Upstream bug: https://github.com/quarto-dev/quarto-cli/discussions/11398
+
+sitemap="${QUARTO_PROJECT_OUTPUT_DIR:-_site}/sitemap.xml"
+
+[ -f "$sitemap" ] || exit 0
+
+sed -i 's|/index\.html</loc>|/</loc>|g' "$sitemap"