diff --git a/ts/index.html b/ts/index.html
index 8ed80f1..c91f6e3 100644
--- a/ts/index.html
+++ b/ts/index.html
@@ -32,6 +32,14 @@
       Export .bin
     </button>
     <div class="tb-sep"></div>
+    <button class="tb-btn" onclick="clearAll()">
+      <svg viewBox="0 0 24 24">
+        <polyline points="3 6 5 6 21 6" />
+        <path d="M19 6l-1 14H6L5 6" />
+        <path d="M10 11v6M14 11v6" />
+      </svg>
+      Clear all
+    </button>
     <button class="tb-btn" onclick="addSection()">
       <svg viewBox="0 0 24 24">
         <line x1="12" y1="5" x2="12" y2="19" />
diff --git a/ts/src/browser.ts b/ts/src/browser.ts
index ec3a771..be2374c 100644
--- a/ts/src/browser.ts
+++ b/ts/src/browser.ts
@@ -818,8 +818,28 @@ m.mount(document.getElementById("sections-wrap")!, SectionsList);
 m.mount(document.getElementById("demo-btns")!,     DemoButtons);
 m.mount(document.getElementById("sec-meta")!,      MetaPanel);
 
+async function clearAll() {
+  if (isDirty && file.sections.length) {
+    const ok = await showConfirm("Clear all sections?", [
+      { label: "Cancel", action: false },
+      { label: "Clear", primary: true, action: true },
+    ]);
+    if (!ok) return;
+  }
+  file = new MonoDisplayFile([]);
+  activeSecIndex = null;
+  activeElIndex = null;
+  currentFilename = "untitled";
+  const filenameEl = document.getElementById("filename");
+  if (filenameEl) filenameEl.textContent = "untitled";
+  localStorage.removeItem(STORAGE_KEY);
+  markClean();
+  triggerPreview();
+  m.redraw();
+}
+
 // Expose globals referenced by topbar inline handlers
-Object.assign(window, { loadBin, exportBin, addSection, cycleTheme });
+Object.assign(window, { loadBin, exportBin, addSection, clearAll, cycleTheme });
 
 window.addEventListener("beforeunload", (e) => {
   if (isDirty) e.preventDefault();