diff --git a/packages/ckeditor5-image/src/imageupload/imageuploadediting.ts b/packages/ckeditor5-image/src/imageupload/imageuploadediting.ts
index a2350e312c5..18f92ae24aa 100644
--- a/packages/ckeditor5-image/src/imageupload/imageuploadediting.ts
+++ b/packages/ckeditor5-image/src/imageupload/imageuploadediting.ts
@@ -225,12 +225,14 @@ export default class ImageUploadEditing extends Plugin {
 		} );
 
 		// Set the default handler for feeding the image element with `src` and `srcset` attributes.
+		// Load the image, read and set `width` and `height` attributes (original sizes).
 		this.on<ImageUploadCompleteEvent>( 'uploadComplete', ( evt, { imageElement, data } ) => {
 			const urls = data.urls ? data.urls as Record<string, unknown> : data;
 
 			this.editor.model.change( writer => {
 				writer.setAttribute( 'src', urls.default, imageElement );
 				this._parseAndSetSrcsetAttributeOnImage( urls, imageElement, writer );
+				imageUtils.loadImageAndSetSizeAttributes( imageElement );
 			} );
 		}, { priority: 'low' } );
 	}
diff --git a/packages/ckeditor5-image/src/imageutils.ts b/packages/ckeditor5-image/src/imageutils.ts
index d8432b33501..73f584e28df 100644
--- a/packages/ckeditor5-image/src/imageutils.ts
+++ b/packages/ckeditor5-image/src/imageutils.ts
@@ -24,11 +24,17 @@ import type {
 import { Plugin, type Editor } from 'ckeditor5/src/core';
 import { findOptimalInsertionRange, isWidget, toWidget } from 'ckeditor5/src/widget';
 import { determineImageTypeForInsertionAtSelection } from './image/utils';
+import { DomEmitterMixin, type DomEmitter, global } from 'ckeditor5/src/utils';
 
 /**
  * A set of helpers related to images.
  */
 export default class ImageUtils extends Plugin {
+	/**
+	 * DOM Emitter.
+	 */
+	private _domEmitter: DomEmitter = new ( DomEmitterMixin() )();
+
 	/**
 	 * @inheritDoc
 	 */
@@ -121,6 +127,8 @@ export default class ImageUtils extends Plugin {
 
 			// Inserting an image might've failed due to schema regulations.
 			if ( imageElement.parent ) {
+				this.loadImageAndSetSizeAttributes( imageElement );
+
 				return imageElement;
 			}
 
@@ -128,6 +136,43 @@ export default class ImageUtils extends Plugin {
 		} );
 	}
 
+	/**
+	 * Loads image file based on `src`, reads original image sizes and sets them as `width` and `height`.
+	 *
+	 * The `src` attribute may not be available if the user is using an upload adapter. In such a case,
+	 * this method is called again after the upload process is complete and the `src` attribute is available.
+	 */
+	public loadImageAndSetSizeAttributes( imageElement: Element ): void {
+		const src = imageElement.getAttribute( 'src' ) as string;
+
+		if ( !src ) {
+			return;
+		}
+
+		if ( imageElement.getAttribute( 'width' ) || imageElement.getAttribute( 'height' ) ) {
+			return;
+		}
+
+		const img = new global.window.Image();
+
+		this._domEmitter.listenTo( img, 'load', ( evt, data ) => {
+			this._setWidthAndHeight( imageElement, img.naturalWidth, img.naturalHeight );
+			this._domEmitter.stopListening( img, 'load' );
+		} );
+
+		img.src = src;
+	}
+
+	/**
+	 * Sets image `width` and `height` attributes.
+	 */
+	private _setWidthAndHeight( imageElement: Element, width: number, height: number ): void {
+		this.editor.model.enqueueChange( { isUndoable: false }, writer => {
+			writer.setAttribute( 'width', width, imageElement );
+			writer.setAttribute( 'height', height, imageElement );
+		} );
+	}
+
 	/**
 	 * Returns an image widget editing view element if one is selected or is among the selection's ancestors.
 	 */
@@ -239,6 +284,15 @@ export default class ImageUtils extends Plugin {
 			}
 		}
 	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public override destroy(): void {
+		this._domEmitter.stopListening();
+
+		return super.destroy();
+	}
 }
 
 /**
diff --git a/packages/ckeditor5-image/tests/imageupload/imageuploadediting.js b/packages/ckeditor5-image/tests/imageupload/imageuploadediting.js
index e05ceb20a0a..fab20c27cc0 100644
--- a/packages/ckeditor5-image/tests/imageupload/imageuploadediting.js
+++ b/packages/ckeditor5-image/tests/imageupload/imageuploadediting.js
@@ -487,6 +487,32 @@ describe( 'ImageUploadEditing', () => {
 		expect( loader.status ).to.equal( 'idle' );
 	} );
 
+	it( 'should set image width and height after server response', async () => {
+		const file = createNativeFileMock();
+		setModelData( model, '<paragraph>{}foo bar</paragraph>' );
+		editor.execute( 'uploadImage', { file } );
+
+		await new Promise( res => {
+			model.document.once( 'change', res );
+			loader.file.then( () => nativeReaderMock.mockSuccess( base64Sample ) );
+		} );
+
+		await new Promise( res => {
+			model.document.once( 'change', res, { priority: 'lowest' } );
+			loader.file.then( () => adapterMocks[ 0 ].mockSuccess( { default: '/assets/sample.png' } ) );
+		} );
+
+		await timeout( 100 );
+
+		expect( getModelData( model ) ).to.equal(
+			'<paragraph>[<imageInline height="96" src="/assets/sample.png" width="96"></imageInline>]foo bar</paragraph>'
+		);
+
+		function timeout( ms ) {
+			return new Promise( res => setTimeout( res, ms ) );
+		}
+	} );
+
 	it( 'should support adapter response with the normalized `urls` property', async () => {
 		const file = createNativeFileMock();
 		setModelData( model, '<paragraph>{}foo bar</paragraph>' );
diff --git a/packages/ckeditor5-image/tests/imageutils.js b/packages/ckeditor5-image/tests/imageutils.js
index ffb86c9d679..f808daeb7af 100644
--- a/packages/ckeditor5-image/tests/imageutils.js
+++ b/packages/ckeditor5-image/tests/imageutils.js
@@ -3,7 +3,7 @@
  * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
  */
 
-/* global console */
+/* global console, setTimeout */
 
 import VirtualTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/virtualtesteditor';
 import ViewDowncastWriter from '@ckeditor/ckeditor5-engine/src/view/downcastwriter';
@@ -706,6 +706,20 @@ describe( 'ImageUtils plugin', () => {
 
 			expect( imageElement ).to.be.null;
 		} );
+
+		it( 'should set image width and height', done => {
+			setModelData( model, '<paragraph>f[o]o</paragraph>' );
+
+			imageUtils.insertImage( { src: '/assets/sample.png' } );
+
+			setTimeout( () => {
+				expect( getModelData( model ) ).to.equal(
+					'<paragraph>f[<imageInline height="96" src="/assets/sample.png" width="96"></imageInline>]o</paragraph>'
+				);
+
+				done();
+			}, 100 );
+		} );
 	} );
 
 	describe( 'findViewImgElement()', () => {