diff --git a/README.md b/README.md
index 6d104b4..2100c4f 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ A simple notes app that runs entirely in your web browser. There is nothing to i
 - Your notes are listed on the left. The editor for the selected note is on the right.
 - Everything you type is saved automatically.
 - You can search your notes, create new ones, and delete ones you no longer need.
+- Click **Download all notes** (at the bottom of the list) to save a copy of every note in a single text file. This is a handy way to back up your notes.
 
 ## How to start it
 
diff --git a/index.html b/index.html
index a18bd35..a71424b 100644
--- a/index.html
+++ b/index.html
@@ -100,6 +100,13 @@
     overflow: hidden;
     text-overflow: ellipsis;
   }
+  #sidebar-bottom {
+    padding: 10px 12px;
+    border-top: 1px solid var(--border);
+  }
+  #download-btn { width: 100%; }
+  button:disabled { opacity: 0.5; cursor: default; }
+  button:disabled:hover { border-color: var(--border); }
   .empty-list {
     padding: 20px 14px;
     color: var(--muted);
@@ -169,6 +176,9 @@
     <button id="new-btn" class="primary" title="New note (Ctrl+Alt+N)">+ New</button>
   </div>
   <ul id="note-list" aria-label="Notes"></ul>
+  <div id="sidebar-bottom">
+    <button id="download-btn" title="Save a copy of all your notes as a text file">⬇ Download all notes</button>
+  </div>
 </aside>
 
 <main id="editor">
@@ -204,6 +214,7 @@
   var statusEl = $("status");
   var deleteBtn = $("delete-btn");
   var placeholderEl = $("placeholder");
+  var downloadBtn = $("download-btn");
 
   // ---------- Storage ----------
 
@@ -341,6 +352,7 @@
   }
 
   function render() {
+    downloadBtn.disabled = notes.length === 0;
     renderList();
     renderEditor();
   }
@@ -377,6 +389,42 @@
     save();
   }
 
+  function fullDate(ts) {
+    return ts ? new Date(ts).toLocaleString() : "unknown";
+  }
+
+  function downloadAll() {
+    if (saveTimer) save();
+    if (notes.length === 0) return;
+
+    var divider = "\n\n" + new Array(41).join("=") + "\n\n";
+    var text = sortedNotes().map(function (note) {
+      var title = displayTitle(note);
+      return title + "\n" +
+        new Array(title.length + 1).join("-") + "\n" +
+        "Created: " + fullDate(note.created) + "\n" +
+        "Last edited: " + fullDate(note.updated) + "\n\n" +
+        (note.body || "").replace(/\r\n?/g, "\n");
+    }).join(divider) + "\n";
+
+    // Windows-style line endings so the file opens nicely everywhere;
+    // the leading BOM tells older programs the text is UTF-8.
+    text = "\ufeff" + text.replace(/\n/g, "\r\n");
+
+    var d = new Date();
+    var pad = function (n) { return (n < 10 ? "0" : "") + n; };
+    var fileName = "notes-" + d.getFullYear() + "-" + pad(d.getMonth() + 1) + "-" + pad(d.getDate()) + ".txt";
+
+    var url = URL.createObjectURL(new Blob([text], { type: "text/plain;charset=utf-8" }));
+    var a = document.createElement("a");
+    a.href = url;
+    a.download = fileName;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    setTimeout(function () { URL.revokeObjectURL(url); }, 1000);
+  }
+
   function onEdit() {
     var note = findNote(selectedId);
     if (!note) return;
@@ -392,6 +440,7 @@
   $("new-btn").addEventListener("click", newNote);
   $("placeholder-new").addEventListener("click", newNote);
   deleteBtn.addEventListener("click", deleteNote);
+  downloadBtn.addEventListener("click", downloadAll);
   titleEl.addEventListener("input", onEdit);
   bodyEl.addEventListener("input", onEdit);
   searchEl.addEventListener("input", renderList);