diff --git a/www/public/favicon.svg b/www/public/favicon.svg
new file mode 100644
index 0000000000..6b362cebb0
--- /dev/null
+++ b/www/public/favicon.svg
@@ -0,0 +1,5 @@
+<svg viewBox="0 0 52 53" xmlns="http://www.w3.org/2000/svg">
+  <!-- Make this icon look nicer in dark mode. (Only Firefox supports this; others ignore it.) -->
+  <style>@media (prefers-color-scheme: dark){polygon{fill:#9c7bea}}</style>
+  <polygon fill="#7d59dd" points="0,0 23.8834,3.21052 37.2438,19.0101 45.9665,16.6324 50.5,22 45,22 44.0315,26.3689 26.4673,39.3424 27.4527,45.2132 17.655,53 23.6751,22.7086"/>
+</svg>