diff --git a/web-ui/arduino-emulator.html b/web-ui/arduino-emulator.html
index f1f1585..be335b2 100644
--- a/web-ui/arduino-emulator.html
+++ b/web-ui/arduino-emulator.html
@@ -7949,11 +7949,10 @@ function mobToggleBoard(){
   function openZoom(canvas) {
     _src = canvas;
     // 화면의 90% 이내에서 최대 정수 배율
-    const maxScale = Math.min(
-      Math.floor(window.innerWidth  * 0.9 / canvas.width),
-      Math.floor(window.innerHeight * 0.9 / canvas.height)
+    const scale = Math.min(1.5,
+      window.innerWidth  * 0.9 / canvas.width,
+      window.innerHeight * 0.9 / canvas.height
     );
-    const scale = Math.max(1, maxScale);
     zoomCanvas.width  = canvas.width  * scale;
     zoomCanvas.height = canvas.height * scale;
     overlay.classList.add('open');