diff --git a/web/favicon.svg b/web/favicon.svg
new file mode 100644
index 0000000..869047a
--- /dev/null
+++ b/web/favicon.svg
@@ -0,0 +1,10 @@
+<svg viewBox="0 0 64 64" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- 深蓝色圆背景 -->
+  <circle cx="32" cy="32" r="32" fill="#357ae8" fill-opacity="0.95"/>
+  <!-- 稍微下移且居中的白色锁体 -->
+  <rect x="12" y="20" width="40" height="32" rx="10" fill="#fff"/>
+  <!-- 稍微下移的锁头圆弧 -->
+  <path d="M20 28v-8a12 12 0 0 1 24 0v8" fill="none" stroke="#fff" stroke-width="6"/>
+  <!-- 锁孔与背景同色 -->
+  <circle cx="32" cy="40" r="5" fill="#357ae8"/>
+</svg>
diff --git a/web/index.html b/web/index.html
index 30d0be8..668484b 100644
--- a/web/index.html
+++ b/web/index.html
@@ -5,6 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>NodeCrypt</title>
   <link rel="stylesheet" href="style.css">
+  <link rel="icon" type="image/svg+xml" href="favicon.svg">
   <script>window.NODECRYPT_PUBLIC_KEY = 'NODECRYPT_PUBLIC_KEY'</script>
 </head>
 <body>