diff --git a/README.md b/README.md
index 55b982c..7d4f253 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,7 @@ nginx/default.conf                  basic auth, gzip, JSON listing of /data/, /h
 nginx/security-headers.conf         CSP and other headers, included per location
 html/index.html                     markup
 html/style.css                      styles (light/dark tokens)
+html/favicon.svg                    favicon (Material Symbols "chart_data")
 html/i18n.js                        English / German strings
 html/app.js                         dataset loading, CSV parsing, statistics, chart
 html/vendor/                        Plotly 2.35.2 + German locale
diff --git a/html/favicon.svg b/html/favicon.svg
new file mode 100644
index 0000000..4ff6403
--- /dev/null
+++ b/html/favicon.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" width="24" height="24">
+  <!-- Material Symbols Outlined "chart_data" (Apache-2.0), FILL 0 / wght 400 / GRAD 0 / opsz 24 -->
+  <style>path { fill: #1b1b1f; } @media (prefers-color-scheme: dark) { path { fill: #ffffff; } }</style>
+  <path d="m296-320 122-122 80 80 142-141v63h80v-200H520v80h63l-85 85-80-80-178 179 56 56Zm-96 200q-33 0-56.5-23.5T120-200v-560q0-33 23.5-56.5T200-840h560q33 0 56.5 23.5T840-760v560q0 33-23.5 56.5T760-120H200Zm0-80h560v-560H200v560Zm0-560v560-560Z"/>
+</svg>
diff --git a/html/index.html b/html/index.html
index 90f1397..cbde048 100644
--- a/html/index.html
+++ b/html/index.html
@@ -4,6 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Heatpump Cycles</title>
+<link rel="icon" href="favicon.svg" type="image/svg+xml">
 <link rel="stylesheet" href="style.css">
 <script src="vendor/plotly.min.js" defer></script>
 <script src="vendor/plotly-locale-de.js" defer></script>