diff --git a/README.md b/README.md
index 7c1cef5..c77e14f 100644
--- a/README.md
+++ b/README.md
@@ -49,23 +49,22 @@ npm run lint
 
 # TODO / Roadmap
 
-* Something weird with best fit only fitting when window resize fires (also see weird non-cleared canvas areas)
-* When resizing document, layers are not always equal to the document size/width (e.g. pasted from selections)
-* Layer bitmaps and masks must not be stored as Vue observables
 * Layer and mask coordinates are not saved when saving / switching document?
+* When resizing document, positioned layers do not scale their position correctly
+* Layer bitmaps and masks must not be stored as Vue observables
 * Make canvas only as large as its wrapper. Use viewport in zCanvas to render visible content (requires custom scroll handlers for panning)
-* Layer view in options-panel: allow naming, repositioning, toggle visibility, opacity
-* Canvas util : store transparency of images
+* Layer view in options-panel: allow naming, repositioning, toggling visibility and opacity
+* Canvas util : store transparency of images into saved document
 * Restored base64 images should be treated as binary once more (see layer-factory)
-* scale logic should move from zoomable-canvas into zCanvas (as handleInteraction needs to transform offsets by zoom ratio, see LayerSprite!)
 * Zoom set original size isn't that accurate (check also on mobile views), needs calculateMaxScaling ?
+* Unload Blobs when images are no longer used in document (see sprite-factory disposeSprite, keep instance count of usages)
+* Load/save documents directly from/to Dropbox
+* Implement layer rotation
+* Implement layer scaling
 * Implement rectangular selection
 * Implement merged layer selection
-* Unload Blobs when images are no longer used in document (see sprite-factory disposeSprite, keep instance count of usages)
-* Load/save documents from/to Dropbox
-* Text editing using Google fonts!
-* Add tools for layer rotation and scaling
-* Implement layer scale
-* Implement clone brush
 * Implement document crop
+* Implement clone brush
 * Implement change history
+* Implement text editing using Google fonts!
+* Scale logic should move from zoomable-canvas into zCanvas (as handleInteraction needs to transform offsets by zoom ratio, see LayerSprite!)
diff --git a/src/components/ui/zcanvas/layer-sprite.js b/src/components/ui/zcanvas/layer-sprite.js
index d8b03c6..8c3fa0b 100644
--- a/src/components/ui/zcanvas/layer-sprite.js
+++ b/src/components/ui/zcanvas/layer-sprite.js
@@ -156,7 +156,8 @@ class LayerSprite extends sprite {
     }
 
     async resize( width, height ) {
-        const ratio = width / this.width;
+        const ratioX = width  / this._bounds.width;
+        const ratioY = height / this._bounds.height;
 
         if ( this.layer.bitmap ) {
             this.layer.bitmap = await resizeImage(
@@ -169,7 +170,7 @@ class LayerSprite extends sprite {
             );
             this.cacheMask();
         }
-        this.setBounds( this.getX() * ratio, this.getY() * ratio, width, height );
+        this.setBounds( this.getX() * ratioX, this.getY() * ratioY, width, height );
         this.invalidate();
     }
 
diff --git a/src/store/modules/document-module.js b/src/store/modules/document-module.js
index 3356ee3..55b814f 100644
--- a/src/store/modules/document-module.js
+++ b/src/store/modules/document-module.js
@@ -48,13 +48,15 @@ export default {
         },
         setActiveDocumentSize( state, { width, height }) {
             const document = state.documents[ state.activeIndex ];
+            const ratioX   = width  / document.width;
+            const ratioY   = height / document.height;
             document.width  = width;
             document.height = height;
             document.layers?.forEach( layer => {
-                layer.width  = width;
-                layer.height = height;
+                layer.width  *= ratioX;
+                layer.height *= ratioY;
+                getSpriteForLayer( layer )?.resize( layer.width, layer.height );
             });
-            runSpriteFn( sprite => sprite.resize( width, height ), document );
         },
         addNewDocument( state, nameOrDocument ) {
             const document = typeof nameOrDocument === "object" ? nameOrDocument : DocumentFactory.create({ name: nameOrDocument });
diff --git a/tests/unit/store/modules/document-module.spec.js b/tests/unit/store/modules/document-module.spec.js
index b1f3222..c31ad78 100644
--- a/tests/unit/store/modules/document-module.spec.js
+++ b/tests/unit/store/modules/document-module.spec.js
@@ -106,15 +106,16 @@ describe( "Vuex document module", () => {
             it( "should request the invalidate() method on each Sprite for the given Document", () => {
                 const state = {
                     documents: [
-                        { name: "foo", width: 30, height: 30 },
-                        { name: "bar", width: 50, height: 50 }
+                        { name: "foo", width: 30, height: 30, layers: [ { name: "layer1", width: 30, height: 30 } ] },
+                        { name: "bar", width: 50, height: 50, layers: [ { name: "layer2", width: 20, height: 10 }, { name: "layer3", width: 15, height: 15 } ] }
                     ],
                     activeIndex : 1,
                 };
                 const size = { width: 75, height: 40 };
                 mockUpdateFn = jest.fn();
                 mutations.setActiveDocumentSize( state, size );
-                expect( mockUpdateFn ).toHaveBeenCalledWith( "runSpriteFn", expect.any( Function ), state.documents[ state.activeIndex ]);
+                expect( mockUpdateFn ).toHaveBeenNthCalledWith( 1, "getSpriteForLayer", state.documents[ 1 ].layers[ 0 ]);
+                expect( mockUpdateFn ).toHaveBeenNthCalledWith( 2, "getSpriteForLayer", state.documents[ 1 ].layers[ 1 ]);
             });
         });