diff --git a/packages/website/package.json b/packages/website/package.json
index fffca759..cd76fbb7 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -15,8 +15,10 @@
     "@docusaurus/core": "2.0.0-beta.21",
     "@docusaurus/preset-classic": "2.0.0-beta.21",
     "@quri/squiggle-components": "^0.2.20",
+    "base64-js": "^1.5.1",
     "clsx": "^1.1.1",
     "hast-util-is-element": "2.1.2",
+    "pako": "^2.0.4",
     "prism-react-renderer": "^1.3.3",
     "react": "^18.1.0",
     "react-dom": "^18.2.0",
diff --git a/packages/website/src/pages/playground.js b/packages/website/src/pages/playground.js
index efbbac13..661aeedd 100644
--- a/packages/website/src/pages/playground.js
+++ b/packages/website/src/pages/playground.js
@@ -1,23 +1,29 @@
+import { deflate, inflate } from "pako";
+import { toByteArray, fromByteArray } from "base64-js";
 import React from "react";
 import Layout from "@theme/Layout";
 import { SquigglePlayground } from "../components/SquigglePlayground";
 
 function getHashData() {
-  if (typeof window === "undefined") {
+  if (typeof window === "undefined" || !window.location.hash) {
     return {};
   }
   try {
-    return JSON.parse(window.decodeURIComponent(window.location.hash.slice(1)));
+    const compressed = toByteArray(
+      decodeURIComponent(window.location.hash.slice(1))
+    );
+    const text = inflate(compressed, { to: "string" });
+    return JSON.parse(text);
   } catch (err) {
     console.error(err);
     return {};
   }
 }
 
-function setHashData(Data) {
-  window.location.hash = window.encodeURIComponent(
-    JSON.stringify({ ...getHashData(), ...Data })
-  );
+function setHashData(data) {
+  const text = JSON.stringify({ ...getHashData(), ...data });
+  const compressed = deflate(text, { level: 9 });
+  window.location.hash = encodeURIComponent(fromByteArray(compressed));
 }
 
 export default function PlaygroundPage() {
diff --git a/yarn.lock b/yarn.lock
index b1c89aa7..b4ed1289 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4344,7 +4344,7 @@
   dependencies:
     "@types/react" "*"
 
-"@types/react@*", "@types/react@^18.0.1", "@types/react@^18.0.9":
+"@types/react@*", "@types/react@^18.0.9":
   version "18.0.14"
   resolved "https://registry.yarnpkg.com/@types/react/-/react-18.0.14.tgz#e016616ffff51dba01b04945610fe3671fdbe06d"
   integrity sha512-x4gGuASSiWmo0xjDLpm5mPb52syZHJx02VKbqUKdLmKtAwIh63XClGsiTI1K6DO5q7ox4xAsQrU+Gl3+gGXF9Q==
@@ -5853,7 +5853,7 @@ base16@^1.0.0:
   resolved "https://registry.yarnpkg.com/base16/-/base16-1.0.0.tgz#e297f60d7ec1014a7a971a39ebc8a98c0b681e70"
   integrity sha512-pNdYkNPiJUnEhnfXV56+sQy8+AaPcG3POZAUnwr4EeqCUZFz4u2PePbo3e5Gj4ziYPCWGUZT9RHisvJKnwFuBQ==
 
-base64-js@^1.0.2:
+base64-js@^1.0.2, base64-js@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.5.1.tgz#1b1b440160a5bf7ad40b650f095963481903930a"
   integrity sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==
@@ -13082,6 +13082,11 @@ package-json@^6.3.0:
     registry-url "^5.0.0"
     semver "^6.2.0"
 
+pako@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/pako/-/pako-2.0.4.tgz#6cebc4bbb0b6c73b0d5b8d7e8476e2b2fbea576d"
+  integrity sha512-v8tweI900AUkZN6heMU/4Uy4cXRc2AYNRggVmTR+dEncawDJgCdLMximOVA2p4qO57WMynangsfGRb5WD6L1Bg==
+
 pako@~1.0.5:
   version "1.0.11"
   resolved "https://registry.yarnpkg.com/pako/-/pako-1.0.11.tgz#6c9599d340d54dfd3946380252a35705a6b992bf"
@@ -14791,7 +14796,7 @@ react-vega@^7.5.1:
     prop-types "^15.8.1"
     vega-embed "^6.5.1"
 
-react@^18.0.0, react@^18.1.0:
+react@^18.1.0:
   version "18.2.0"
   resolved "https://registry.yarnpkg.com/react/-/react-18.2.0.tgz#555bd98592883255fa00de14f1151a917b5d77d5"
   integrity sha512-/3IjMdb2L9QbBdWiW5e3P2/npwMBaU9mHCSCUzNln0ZCYbcfTsGbTJrU/kGemdH2IWmB2ioZ+zkxtmq6g09fGQ==