diff --git a/course/templates/course/sandbox-markup.html b/course/templates/course/sandbox-markup.html
index c588c6b90..040b2b69c 100644
--- a/course/templates/course/sandbox-markup.html
+++ b/course/templates/course/sandbox-markup.html
@@ -16,5 +16,41 @@ <h1>{% trans "Markup Sandbox" %}</h1>
   <div class="relate-well">
     {% crispy form %}
   </div>
+
+  {# {{{ paste from clipboard #}
+
+  <script type="text/javascript">
+    (function() {
+      if (!navigator.clipboard || !navigator.clipboard.readText) {
+        return;
+      }
+      const previewBtn = document.getElementById('submit-id-preview');
+      if (!previewBtn) {
+        return;
+      }
+      const pasteBtn = document.createElement('input');
+      pasteBtn.type = 'button';
+      pasteBtn.className = 'btn btn-secondary ms-1';
+      pasteBtn.value = "{% trans 'Paste from clipboard' %}";
+      pasteBtn.addEventListener('click', function() {
+        navigator.clipboard.readText().then(function(text) {
+          const editorDom = document.querySelector('#div_id_content .cm-editor');
+          if (!editorDom) { return; }
+          const view = rlCodemirror.EditorView.findFromDOM(editorDom);
+          if (!view) { return; }
+          view.dispatch(view.state.update({
+            changes: { from: 0, to: view.state.doc.length, insert: text },
+          }));
+          previewBtn.click();
+        }).catch(function(err) {
+          console.error('Failed to read clipboard:', err);
+        });
+      });
+      previewBtn.parentNode.insertBefore(pasteBtn, previewBtn.nextSibling);
+    })();
+  </script>
+
+  {# }}} #}
+
 {% endblock %}
 
diff --git a/course/templates/course/sandbox-page.html b/course/templates/course/sandbox-page.html
index 65f8fc715..8a00070dd 100644
--- a/course/templates/course/sandbox-page.html
+++ b/course/templates/course/sandbox-page.html
@@ -85,21 +85,37 @@ <h1>{% trans "Page Sandbox" %}</h1>
     </div>
   </div>
 
-  {# {{{ codemirror save -> preview #}
+  {# {{{ paste from clipboard #}
 
   <script type="text/javascript">
-    function do_preview()
-    {
-      $("#submit-id-preview").click();
-    }
-
-    $("div#div_id_content div.CodeMirror").each(
-        function ()
-        {
-          var cm = this.CodeMirror;
-          cm.save = do_preview;
+    (function() {
+      if (!navigator.clipboard || !navigator.clipboard.readText) {
+        return;
+      }
+      const previewBtn = document.getElementById('submit-id-preview');
+      if (!previewBtn) {
+        return;
+      }
+      const pasteBtn = document.createElement('input');
+      pasteBtn.type = 'button';
+      pasteBtn.className = 'btn btn-secondary ms-1';
+      pasteBtn.value = "{% trans 'Paste from clipboard' %}";
+      pasteBtn.addEventListener('click', function() {
+        navigator.clipboard.readText().then(function(text) {
+          const editorDom = document.querySelector('#div_id_content .cm-editor');
+          if (!editorDom) { return; }
+          const view = rlCodemirror.EditorView.findFromDOM(editorDom);
+          if (!view) { return; }
+          view.dispatch(view.state.update({
+            changes: { from: 0, to: view.state.doc.length, insert: text },
+          }));
+          previewBtn.click();
+        }).catch(function(err) {
+          console.error('Failed to read clipboard:', err);
         });
-
+      });
+      previewBtn.parentNode.insertBefore(pasteBtn, previewBtn.nextSibling);
+    })();
   </script>
 
   {# }}} #}
@@ -112,11 +128,11 @@ <h1>{% trans "Page Sandbox" %}</h1>
 
     function force_cm_focus()
     {
-      $("div#div_id_content div.CodeMirror").each(
-          function ()
-          {
-            this.CodeMirror.focus();
-          });
+      const editorDom = document.querySelector('#div_id_content .cm-editor');
+      if (editorDom) {
+        const view = rlCodemirror.EditorView.findFromDOM(editorDom);
+        if (view) { view.focus(); }
+      }
     }
 
     setTimeout(force_cm_focus, 100);