diff --git a/src/ImJoyPluginAPI.js b/src/ImJoyPluginAPI.js
index a8edc29c..d6cba164 100644
--- a/src/ImJoyPluginAPI.js
+++ b/src/ImJoyPluginAPI.js
@@ -358,6 +358,18 @@ class ImJoyPluginAPI {
   getCompareImages(name) {
     return this.viewer.getCompareImages(name)
   }
+
+  getLoadedScale(scale) {
+    return this.viewer.getLoadedScale(scale)
+  }
+
+  getCroppedImageWorldBounds() {
+    return this.viewer.getCroppedImageWorldBounds()
+  }
+
+  async getCroppedIndexBounds(scale) {
+    return await this.viewer.getCroppedIndexBounds(scale)
+  }
 }
 
 export default ImJoyPluginAPI
diff --git a/src/createViewer.js b/src/createViewer.js
index ea3f2a02..d2590501 100644
--- a/src/createViewer.js
+++ b/src/createViewer.js
@@ -1,3 +1,4 @@
+import { mat4 } from 'gl-matrix'
 import { inspect } from '@xstate/inspect'
 import { interpret } from 'xstate'
 
@@ -13,11 +14,13 @@ import hex2rgb from './UserInterface/hex2rgb'
 import ViewerStore from './ViewerStore'
 
 import toMultiscaleSpatialImage from './IO/toMultiscaleSpatialImage'
+import { worldBoundsToIndexBounds } from './IO/MultiscaleSpatialImage'
 import viewerMachineOptions from './viewerMachineOptions'
 import createViewerMachine from './createViewerMachine'
 import ViewerMachineContext from './Context/ViewerMachineContext'
 import {
   addCroppingPlanes,
+  getCropWidgetBounds,
   updateCroppingParameters,
 } from './Rendering/VTKJS/Main/croppingPlanes'
 
@@ -1254,6 +1257,33 @@ const createViewer = async (
     return context.maxConcurrency
   }
 
+  publicAPI.getLoadedScale = name => {
+    const imageName = name ?? context.images.selectedName
+    const actorContext = context.images.actorContext.get(imageName)
+    return actorContext.loadedScale
+  }
+
+  publicAPI.getCroppedImageWorldBounds = () => {
+    return getCropWidgetBounds(context)
+  }
+
+  publicAPI.getCroppedIndexBounds = async (scale, name) => {
+    const imageName = name ?? context.images.selectedName
+    const actorContext = context.images.actorContext.get(imageName)
+    if (typeof scale === 'undefined' || scale < 0) {
+      scale = actorContext.loadedScale
+    }
+    const image = actorContext.image
+    const bounds = getCropWidgetBounds(context)
+    const indexToWorld = await image.scaleIndexToWorld(scale)
+    const fullIndexBounds = image.getIndexBounds(scale)
+    return worldBoundsToIndexBounds({
+      bounds,
+      fullIndexBounds,
+      worldToIndex: mat4.invert([], indexToWorld),
+    })
+  }
+
   addKeyboardShortcuts(context.uiContainer, service)
 
   // must come before moving/main image