diff --git a/src/commands/diff.html b/src/commands/diff.html
index 3e39f6b..20ad8c0 100644
--- a/src/commands/diff.html
+++ b/src/commands/diff.html
@@ -75,9 +75,12 @@
     }
   }
 
-  renderAll("side-by-side");
+  const saved = localStorage.getItem("sandlot-unified") === "1";
+  toggle.checked = saved;
+  renderAll(saved ? "line-by-line" : "side-by-side");
 
   toggle.addEventListener("change", function () {
+    localStorage.setItem("sandlot-unified", this.checked ? "1" : "0");
     renderAll(this.checked ? "line-by-line" : "side-by-side");
   });
 </script>