diff --git a/site/apple-touch-icon.png b/site/apple-touch-icon.png
new file mode 100644
index 0000000..ed9b238
Binary files /dev/null and b/site/apple-touch-icon.png differ
diff --git a/site/favicon.ico b/site/favicon.ico
new file mode 100644
index 0000000..e7d580b
Binary files /dev/null and b/site/favicon.ico differ
diff --git a/site/favicon.svg b/site/favicon.svg
new file mode 100644
index 0000000..0254902
--- /dev/null
+++ b/site/favicon.svg
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" role="img" aria-label="editor-ruler">
+  <rect width="32" height="32" rx="6" fill="#2563eb" />
+  <!-- Every coordinate is even so that at 16px — where a favicon actually
+       lives — each edge lands on a whole pixel instead of smearing across
+       two. Three fat notches survive that downscale; five thin ones did not. -->
+  <rect x="4" y="10" width="24" height="12" rx="2" fill="#ffffff" />
+  <g fill="#2563eb">
+    <rect x="10" y="10" width="2" height="6" />
+    <rect x="16" y="10" width="2" height="6" />
+    <rect x="22" y="10" width="2" height="6" />
+  </g>
+</svg>
diff --git a/site/index.html b/site/index.html
index 306f7aa..75c917a 100644
--- a/site/index.html
+++ b/site/index.html
@@ -9,6 +9,12 @@
       content="웹 리치텍스트 에디터를 위한 Word 스타일 가로 줄자. 여백·첫 줄 들여쓰기 드래그 핸들, 세로 줄자, 가이드선·스냅. Froala·Tiptap·CKEditor 5 어댑터, 의존성 0 코어. API 1.0 안정."
     />
     <link rel="canonical" href="https://devslab-kr.github.io/editor-ruler/" />
+    <!-- Relative so these resolve under /editor-ruler/ on Pages and at the
+         root locally. Declaring them also stops the browser's blind request
+         for /favicon.ico, which on Pages would hit the org root, not us. -->
+    <link rel="icon" href="favicon.ico" sizes="32x32" />
+    <link rel="icon" href="favicon.svg" type="image/svg+xml" />
+    <link rel="apple-touch-icon" href="apple-touch-icon.png" />
     <meta property="og:type" content="website" />
     <meta property="og:site_name" content="devslab open source" />
     <meta property="og:url" content="https://devslab-kr.github.io/editor-ruler/" />