diff --git a/docs/.vitepress/theme/components/PlaygroundLayout.vue b/docs/.vitepress/theme/components/PlaygroundLayout.vue
index e9e6d68..e33add0 100644
--- a/docs/.vitepress/theme/components/PlaygroundLayout.vue
+++ b/docs/.vitepress/theme/components/PlaygroundLayout.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts">
 import type { Delimiter } from '../../../../packages/toon/src'
 import { useClipboard, useDebounceFn } from '@vueuse/core'
-import { compressToEncodedURIComponent, decompressFromEncodedURIComponent } from 'lz-string'
+import { unzlibSync, zlibSync } from 'fflate'
+import { base64ToUint8Array, stringToUint8Array, uint8ArrayToBase64, uint8ArrayToString } from 'uint8array-extras'
 import { computed, onMounted, ref, shallowRef, watch } from 'vue'
 import { DEFAULT_DELIMITER, encode } from '../../../../packages/toon/src'
 import VPInput from './VPInput.vue'
@@ -119,12 +120,15 @@ function encodeState() {
     indent: indent.value,
   }
 
-  return compressToEncodedURIComponent(JSON.stringify(state))
+  const compressedData = zlibSync(stringToUint8Array(JSON.stringify(state)))
+  return uint8ArrayToBase64(compressedData, { urlSafe: true })
 }
 
 function decodeState(hash: string) {
   try {
-    const decodedData = decompressFromEncodedURIComponent(hash)
+    const bytes = base64ToUint8Array(hash)
+    const decompressedData = unzlibSync(bytes)
+    const decodedData = uint8ArrayToString(decompressedData)
     if (decodedData)
       return JSON.parse(decodedData) as PlaygroundState
   }
diff --git a/docs/package.json b/docs/package.json
index ef7c118..fe21553 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -9,9 +9,10 @@
   },
   "devDependencies": {
     "@vueuse/core": "^14.1.0",
+    "fflate": "^0.8.2",
     "gpt-tokenizer": "^3.4.0",
-    "lz-string": "^1.5.0",
     "markdown-it-mathjax3": "^4.3.2",
+    "uint8array-extras": "^1.5.0",
     "unocss": "^66.5.9",
     "vitepress": "^1.6.4",
     "vitepress-plugin-llms": "^1.9.3"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1a25673..6b2acef 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -92,15 +92,18 @@ importers:
       '@vueuse/core':
         specifier: ^14.1.0
         version: 14.1.0(vue@3.5.24(typescript@5.9.3))
+      fflate:
+        specifier: ^0.8.2
+        version: 0.8.2
       gpt-tokenizer:
         specifier: ^3.4.0
         version: 3.4.0
-      lz-string:
-        specifier: ^1.5.0
-        version: 1.5.0
       markdown-it-mathjax3:
         specifier: ^4.3.2
         version: 4.3.2
+      uint8array-extras:
+        specifier: ^1.5.0
+        version: 1.5.0
       unocss:
         specifier: ^66.5.9
         version: 66.5.9(postcss@8.5.6)(vite@7.2.4(@types/node@24.10.1)(jiti@2.6.1)(tsx@4.20.6)(yaml@2.8.1))
@@ -2177,6 +2180,9 @@ packages:
       picomatch:
         optional: true
 
+  fflate@0.8.2:
+    resolution: {integrity: sha512-cPJU47OaAoCbg0pBvzsgpTPhmhqI5eJjh/JIu8tPj5q+T7iLvW/JAYUqmE7KOB4R1ZyEhzBaIQpQpardBF5z8A==}
+
   file-entry-cache@8.0.0:
     resolution: {integrity: sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==}
     engines: {node: '>=16.0.0'}
@@ -2459,10 +2465,6 @@ packages:
   lru-cache@10.4.3:
     resolution: {integrity: sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==}
 
-  lz-string@1.5.0:
-    resolution: {integrity: sha512-h5bgJWpxJNswbU7qCrV0tIKQCaS3blPDrqKWx+QxzuzL1zGUzij9XCWLrSLsJPu5t+eWA/ycetzYAO5IOMcWAQ==}
-    hasBin: true
-
   magic-string@0.30.21:
     resolution: {integrity: sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==}
 
@@ -3200,6 +3202,10 @@ packages:
   ufo@1.6.1:
     resolution: {integrity: sha512-9a4/uxlTWJ4+a5i0ooc1rU7C7YOw3wT+UGqdeNNHWnOF9qcMBgLRS+4IYUqbczewFx4mLEig6gawh7X6mFlEkA==}
 
+  uint8array-extras@1.5.0:
+    resolution: {integrity: sha512-rvKSBiC5zqCCiDZ9kAOszZcDvdAHwwIKJG33Ykj43OKcWsnmcBRL09YTU4nOeHZ8Y2a7l1MgTd08SBe9A8Qj6A==}
+    engines: {node: '>=18'}
+
   unconfig-core@7.4.1:
     resolution: {integrity: sha512-Bp/bPZjV2Vl/fofoA2OYLSnw1Z0MOhCX7zHnVCYrazpfZvseBbGhwcNQMxsg185Mqh7VZQqK3C8hFG/Dyng+yA==}
 
@@ -5664,6 +5670,8 @@ snapshots:
     optionalDependencies:
       picomatch: 4.0.3
 
+  fflate@0.8.2: {}
+
   file-entry-cache@8.0.0:
     dependencies:
       flat-cache: 4.0.1
@@ -5927,8 +5935,6 @@ snapshots:
 
   lru-cache@10.4.3: {}
 
-  lz-string@1.5.0: {}
-
   magic-string@0.30.21:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
@@ -6856,6 +6862,8 @@ snapshots:
 
   ufo@1.6.1: {}
 
+  uint8array-extras@1.5.0: {}
+
   unconfig-core@7.4.1:
     dependencies:
       '@quansync/fs': 0.1.5