diff --git a/src/ViewerCore.tsx b/src/ViewerCore.tsx
index dbd63d2..17139c8 100644
--- a/src/ViewerCore.tsx
+++ b/src/ViewerCore.tsx
@@ -47,6 +47,7 @@ export default class ViewerCore extends React.Component<ViewerProps, ViewerCoreS
     zoomSpeed: .05,
     disableKeyboardSupport: false,
     noResetZoomAfterChange: false,
+    noLimitInitializationSize: false,
   };
 
   private prefixCls: string;
@@ -150,7 +151,16 @@ export default class ViewerCore extends React.Component<ViewerProps, ViewerCoreS
       realImgWidth = activeImage.defaultSize.width;
       realImgHeight = activeImage.defaultSize.height;
     }
-    const [width, height] = this.getImgWidthHeight(realImgWidth, realImgHeight);
+    let width = null;
+    let height = null;
+    if (this.props.noLimitInitializationSize) {
+      width = realImgWidth;
+      height = realImgHeight;
+    } else {
+      const imgSize = this.getImgWidthHeight(realImgWidth, realImgHeight);
+      width = imgSize[0];
+      height = imgSize[1];
+    }
     let left = (this.containerWidth - width) / 2;
     let top = (this.containerHeight - height - this.footerHeight) / 2;
     let scaleX = 1;
diff --git a/src/ViewerProps.ts b/src/ViewerProps.ts
index afd7a45..d8abd4f 100644
--- a/src/ViewerProps.ts
+++ b/src/ViewerProps.ts
@@ -86,6 +86,9 @@ interface ViewerProps {
 
   // no reset zoom after image change
   noResetZoomAfterChange?: boolean;
+
+  // no limit image initialization size
+  noLimitInitializationSize?: boolean;
 }
 
 export default ViewerProps;