diff --git a/docs/src/components/sandbox/sandbox-frame.tsx b/docs/src/components/sandbox/sandbox-frame.tsx
index 9c1428b..c2eb7f9 100644
--- a/docs/src/components/sandbox/sandbox-frame.tsx
+++ b/docs/src/components/sandbox/sandbox-frame.tsx
@@ -5,10 +5,12 @@ const minimumFrameHeight = 288
 
 export function SandboxFrame({
   children,
+  fill = false,
   reloadKey,
   title,
 }: {
   children: React.ReactNode
+  fill?: boolean
   reloadKey: number
   title: string
 }) {
@@ -71,7 +73,7 @@ export function SandboxFrame({
   }, [reloadKey])
 
   React.useEffect(() => {
-    if (!mountNode) return
+    if (!mountNode || fill) return
 
     const frameDocument = mountNode.ownerDocument
     const updateHeight = () => {
@@ -87,14 +89,14 @@ export function SandboxFrame({
     updateHeight()
 
     return () => resizeObserver.disconnect()
-  }, [mountNode])
+  }, [fill, mountNode])
 
   return (
     <>
       <iframe
         ref={frameRef}
-        className="block w-full border-0 bg-white dark:bg-slate-950"
-        style={{ height }}
+        className={`block w-full border-0 bg-white dark:bg-slate-950 ${fill ? "min-h-0 flex-1" : ""}`}
+        style={{ height: fill ? "100%" : height }}
         sandbox="allow-same-origin"
         title={title}
       />
diff --git a/docs/src/components/sandbox/sandbox.tsx b/docs/src/components/sandbox/sandbox.tsx
index d080e4c..57dbfb3 100644
--- a/docs/src/components/sandbox/sandbox.tsx
+++ b/docs/src/components/sandbox/sandbox.tsx
@@ -84,23 +84,45 @@ function SandboxViewer({
   definition: SandboxDefinition
   title?: string
 }) {
+  const rootRef = React.useRef<HTMLElement>(null)
   const t = useTranslate()
   const filenames = React.useMemo(
     () => Object.keys(definition.files),
     [definition.files]
   )
   const [view, setView] = React.useState<SandboxView>("preview")
-  const [selectedFile, setSelectedFile] = React.useState(definition.defaultFile ?? filenames[0] ?? "")
-  const [previewModule, setPreviewModule] = React.useState<SandboxPreviewModule | null>(null)
+  const [selectedFile, setSelectedFile] = React.useState(
+    definition.defaultFile ?? filenames[0] ?? ""
+  )
+  const [previewModule, setPreviewModule] =
+    React.useState<SandboxPreviewModule | null>(null)
   const [previewError, setPreviewError] = React.useState<Error | null>(null)
   const [source, setSource] = React.useState<string | null>(null)
   const [sourceError, setSourceError] = React.useState<Error | null>(null)
-  const [highlightedSource, setHighlightedSource] = React.useState<HighlightedSource | null>(null)
+  const [highlightedSource, setHighlightedSource] =
+    React.useState<HighlightedSource | null>(null)
   const [codeFontSizeIndex, setCodeFontSizeIndex] = React.useState(1)
   const [reloadKey, setReloadKey] = React.useState(0)
   const [copied, setCopied] = React.useState(false)
+  const [fullscreen, setFullscreen] = React.useState(false)
   const resolvedTitle = title ?? definition.title ?? definition.id
 
+  React.useEffect(() => {
+    const root = rootRef.current
+    if (!root) return
+
+    const ownerDocument = root.ownerDocument
+    const syncFullscreen = () => {
+      setFullscreen(ownerDocument.fullscreenElement === root)
+    }
+
+    syncFullscreen()
+    ownerDocument.addEventListener("fullscreenchange", syncFullscreen)
+    return () => {
+      ownerDocument.removeEventListener("fullscreenchange", syncFullscreen)
+    }
+  }, [])
+
   React.useEffect(() => {
     let active = true
     setPreviewModule(null)
@@ -178,9 +200,26 @@ function SandboxViewer({
     window.setTimeout(() => setCopied(false), 1500)
   }
 
+  const toggleFullscreen = async () => {
+    const root = rootRef.current
+    if (!root) return
+
+    const ownerDocument = root.ownerDocument
+    if (ownerDocument.fullscreenElement === root) {
+      await ownerDocument.exitFullscreen()
+      return
+    }
+
+    if (ownerDocument.fullscreenElement) {
+      await ownerDocument.exitFullscreen()
+    }
+    await root.requestFullscreen()
+  }
+
   return (
     <section
-      className={`not-prose my-6 overflow-hidden rounded-xl border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-950 ${className ?? ""}`}
+      ref={rootRef}
+      className={`not-prose overflow-hidden border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-950 ${fullscreen ? "m-0 flex h-dvh w-dvw flex-col rounded-none border-0" : "my-6 rounded-xl"} ${className ?? ""}`}
       aria-label={resolvedTitle}
     >
       <div className="flex min-h-11 flex-wrap items-center gap-2 border-b border-slate-200 bg-slate-50 px-2 py-1.5 dark:border-slate-800 dark:bg-slate-900/70">
@@ -230,11 +269,28 @@ function SandboxViewer({
               <Icon name="lucide:rotate-ccw" className="size-4" />
             </SandboxAction>
           )}
+          <SandboxAction
+            label={t({
+              zh: fullscreen ? "退出全屏" : "全屏显示",
+              us: fullscreen ? "Exit fullscreen" : "Enter fullscreen",
+            })}
+            pressed={fullscreen}
+            onClick={() => void toggleFullscreen()}
+          >
+            <Icon
+              name={fullscreen ? "lucide:minimize-2" : "lucide:maximize-2"}
+              className="size-4"
+            />
+          </SandboxAction>
         </div>
       </div>
 
       {view === "preview" ? (
-        <SandboxFrame reloadKey={reloadKey} title={resolvedTitle}>
+        <SandboxFrame
+          fill={fullscreen}
+          reloadKey={reloadKey}
+          title={resolvedTitle}
+        >
           <SandboxErrorBoundary key={reloadKey} fallback={renderSandboxError}>
             {previewError ? (
               <SandboxMessage tone="error">
@@ -251,7 +307,7 @@ function SandboxViewer({
         </SandboxFrame>
       ) : (
         <div
-          className={`grid min-h-72 ${filenames.length > 1 ? "md:grid-cols-[12rem_minmax(0,1fr)]" : ""}`}
+          className={`grid min-h-72 ${fullscreen ? "min-h-0 flex-1 overflow-hidden" : ""} ${filenames.length > 1 ? "md:grid-cols-[12rem_minmax(0,1fr)]" : ""}`}
         >
           {filenames.length > 1 ? (
             <nav
@@ -385,17 +441,20 @@ function SandboxAction({
   disabled,
   label,
   onClick,
+  pressed,
 }: {
   children: React.ReactNode
   disabled?: boolean
   label: string
   onClick: VoidFunction
+  pressed?: boolean
 }) {
   return (
     <button
       type="button"
       className="inline-flex size-8 items-center justify-center rounded-md text-slate-500 transition-colors hover:bg-slate-200 hover:text-slate-950 disabled:opacity-40 dark:text-slate-400 dark:hover:bg-slate-800 dark:hover:text-slate-100"
       aria-label={label}
+      aria-pressed={pressed}
       disabled={disabled}
       onClick={onClick}
     >