diff --git a/packages/infinite-viewer/src/InfiniteViewerManager.tsx b/packages/infinite-viewer/src/InfiniteViewerManager.tsx
index a19d42f..11172e8 100644
--- a/packages/infinite-viewer/src/InfiniteViewerManager.tsx
+++ b/packages/infinite-viewer/src/InfiniteViewerManager.tsx
@@ -863,7 +863,7 @@ class InfiniteViewer extends EventEmitter<InfiniteViewerEvents> {
         const pinchDirection = options.pinchDirection;
         const maxPinchWheel = options.maxPinchWheel || Infinity;
 
-        const isKeydown = e[`${this.wheelPinchKey}Key`] || e.ctrlKey;
+        const isKeydown = this.wheelPinchKey === null ? true : e[`${this.wheelPinchKey}Key`] || e.ctrlKey;
 
         if (options.useWheelPinch && isKeydown) {
             let deltaY = e.deltaY;
diff --git a/packages/infinite-viewer/src/types.ts b/packages/infinite-viewer/src/types.ts
index 21d852d..8e547d8 100644
--- a/packages/infinite-viewer/src/types.ts
+++ b/packages/infinite-viewer/src/types.ts
@@ -84,10 +84,10 @@ export interface InfiniteViewerOptions {
      */
     useWheelPinch: boolean;
     /**
-     * Key to use wheel pinch
+     * Key to use wheel pinch. Null if you want wheel pinch without any key.
      * @default "ctrl"
      */
-    wheelPinchKey: "ctrl" | "meta" | "alt" | "shift",
+    wheelPinchKey: "ctrl" | "meta" | "alt" | "shift" | null,
     /**
      * Whether to use wheel scroll. You can scroll smoothly by using the wheel.
      * @default IS_SAFARI