diff --git a/js/Canvas.js b/js/Canvas.js
index 16c0bdb..66f8692 100644
--- a/js/Canvas.js
+++ b/js/Canvas.js
@@ -443,8 +443,8 @@ export class Canvas {
      * Inicjalizuje podstawowe właściwości canvas
      */
     initCanvas() {
-        this.canvas.width = this.width;
-        this.canvas.height = this.height;
+        // Don't set canvas.width/height here - let the render loop handle it based on clientWidth/clientHeight
+        // this.width and this.height are for the OUTPUT AREA, not the display canvas
         this.canvas.style.border = '1px solid black';
         this.canvas.style.maxWidth = '100%';
         this.canvas.style.backgroundColor = '#606060';
diff --git a/js/CanvasLayers.js b/js/CanvasLayers.js
index 0e08158..a1e180f 100644
--- a/js/CanvasLayers.js
+++ b/js/CanvasLayers.js
@@ -1100,8 +1100,8 @@ export class CanvasLayers {
         this.canvas.width = width;
         this.canvas.height = height;
         this.canvas.maskTool.resize(width, height);
-        this.canvas.canvas.width = width;
-        this.canvas.canvas.height = height;
+        // Don't set canvas.width/height - the render loop will handle display size
+        // this.canvas.width/height are for OUTPUT AREA dimensions, not display canvas
         this.canvas.render();
         if (saveHistory) {
             this.canvas.canvasState.saveStateToDB();
diff --git a/src/Canvas.ts b/src/Canvas.ts
index f08b72d..7e29b97 100644
--- a/src/Canvas.ts
+++ b/src/Canvas.ts
@@ -578,8 +578,8 @@ export class Canvas {
      * Inicjalizuje podstawowe właściwości canvas
      */
     initCanvas() {
-        this.canvas.width = this.width;
-        this.canvas.height = this.height;
+        // Don't set canvas.width/height here - let the render loop handle it based on clientWidth/clientHeight
+        // this.width and this.height are for the OUTPUT AREA, not the display canvas
         this.canvas.style.border = '1px solid black';
         this.canvas.style.maxWidth = '100%';
         this.canvas.style.backgroundColor = '#606060';
diff --git a/src/CanvasLayers.ts b/src/CanvasLayers.ts
index d2d9343..b3f4dda 100644
--- a/src/CanvasLayers.ts
+++ b/src/CanvasLayers.ts
@@ -1263,8 +1263,8 @@ export class CanvasLayers {
         this.canvas.height = height;
         this.canvas.maskTool.resize(width, height);
 
-        this.canvas.canvas.width = width;
-        this.canvas.canvas.height = height;
+        // Don't set canvas.width/height - the render loop will handle display size
+        // this.canvas.width/height are for OUTPUT AREA dimensions, not display canvas
 
         this.canvas.render();