diff --git a/static/index.html b/static/index.html
index 9895d11a4..b4cf0b6de 100644
--- a/static/index.html
+++ b/static/index.html
@@ -3,7 +3,6 @@
     <head>
         <title>KaTeX Test</title>
         <script src="katex.js" type="text/javascript"></script>
-        <script src="main.js" type="text/javascript"></script>
         <link href="fonts/fonts.css" rel="stylesheet" type="text/css">
         <link href="katex.css" rel="stylesheet" type="text/css">
         <link href="main.css" rel="stylesheet" type="text/css">
@@ -11,5 +10,7 @@
     <body>
         <input type="text" value="\blue\dfrac{\frac{\phi^2}{3}-G_a^{x^3}}{2\times3+4}+\orange\dfrac{(x^2+y^2)^\frac{1}{2}}{\tan\psi^\tau+2/3}" id="input" />
         <div id="math"></div>
+        <input id="permalink" type="button" value="permalink">
+        <script src="main.js" type="text/javascript"></script>
     </body>
 </html>
diff --git a/static/main.css b/static/main.css
index ab9f3d0bc..a7f178a9d 100644
--- a/static/main.css
+++ b/static/main.css
@@ -4,7 +4,7 @@ body {
     font-size: 72px;
 }
 
-input {
+#input {
     margin: 0px;
     font-size: 100%;
     width: 100%;
diff --git a/static/main.js b/static/main.js
index 63f817928..bf497edfd 100644
--- a/static/main.js
+++ b/static/main.js
@@ -1,6 +1,7 @@
-window.onload = function() {
+function init() {
     var input = document.getElementById("input");
     var math = document.getElementById("math");
+    var permalink = document.getElementById("permalink");
 
     if ("oninput" in input) {
         input.addEventListener("input", reprocess, false);
@@ -8,9 +9,20 @@ window.onload = function() {
         input.attachEvent("onkeyup", reprocess);
     }
 
+    permalink.addEventListener("click", function() {
+        window.location.search = "?text=" + encodeURIComponent(input.value);
+    });
+
+    var match = (/(?:^\?|&)text=([^&]+)/).exec(window.location.search);
+    if (match) {
+        input.value = decodeURIComponent(match[1]);
+    }
+
     reprocess();
 
     function reprocess() {
         katex.process(input.value, math);
     }
-};
+}
+
+init();
