diff --git a/.changeset/empty-badgers-happen.md b/.changeset/empty-badgers-happen.md
new file mode 100644
index 000000000..75eaad716
--- /dev/null
+++ b/.changeset/empty-badgers-happen.md
@@ -0,0 +1,5 @@
+---
+"gitbook-v2": patch
+---
+
+Only resize images with supported extensions.
diff --git a/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.test.ts b/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.test.ts
new file mode 100644
index 000000000..679f2c5ce
--- /dev/null
+++ b/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.test.ts
@@ -0,0 +1,81 @@
+import { describe, expect, it } from 'bun:test';
+import { SizableImageAction, checkIsSizableImageURL } from './checkIsSizableImageURL';
+
+describe('checkIsSizableImageURL', () => {
+    it('should return Skip for non-parsable URLs', () => {
+        expect(checkIsSizableImageURL('not a url')).toBe(SizableImageAction.Skip);
+    });
+
+    it('should return Skip for non-http(s) URLs', () => {
+        expect(checkIsSizableImageURL('data:image/png;base64,abc')).toBe(SizableImageAction.Skip);
+        expect(checkIsSizableImageURL('file:///path/to/image.jpg')).toBe(SizableImageAction.Skip);
+    });
+
+    it('should return Skip for localhost URLs', () => {
+        expect(checkIsSizableImageURL('http://localhost:3000/image.jpg')).toBe(
+            SizableImageAction.Skip
+        );
+        expect(checkIsSizableImageURL('https://localhost/image.png')).toBe(SizableImageAction.Skip);
+    });
+
+    it('should return Skip for GitBook image URLs', () => {
+        expect(checkIsSizableImageURL('https://example.com/~gitbook/image/test.jpg')).toBe(
+            SizableImageAction.Skip
+        );
+    });
+
+    it('should return Resize for supported image extensions', () => {
+        expect(checkIsSizableImageURL('https://example.com/image.jpg')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.jpeg')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.png')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.gif')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.webp')).toBe(
+            SizableImageAction.Resize
+        );
+    });
+
+    it('should return Resize for URLs without extensions', () => {
+        expect(checkIsSizableImageURL('https://example.com/image')).toBe(SizableImageAction.Resize);
+    });
+
+    it('should return Passthrough for unsupported image extensions', () => {
+        expect(checkIsSizableImageURL('https://example.com/image.svg')).toBe(
+            SizableImageAction.Passthrough
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.bmp')).toBe(
+            SizableImageAction.Passthrough
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.tiff')).toBe(
+            SizableImageAction.Passthrough
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.ico')).toBe(
+            SizableImageAction.Passthrough
+        );
+    });
+
+    it('should handle URLs with query parameters correctly', () => {
+        expect(checkIsSizableImageURL('https://example.com/image.jpg?width=100')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.svg?height=200')).toBe(
+            SizableImageAction.Passthrough
+        );
+    });
+
+    it('should be case-insensitive for extensions', () => {
+        expect(checkIsSizableImageURL('https://example.com/image.JPG')).toBe(
+            SizableImageAction.Resize
+        );
+        expect(checkIsSizableImageURL('https://example.com/image.PNG')).toBe(
+            SizableImageAction.Resize
+        );
+    });
+});
diff --git a/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.ts b/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.ts
index 61e3ebbc2..486ea7a69 100644
--- a/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.ts
+++ b/packages/gitbook-v2/src/lib/images/checkIsSizableImageURL.ts
@@ -1,9 +1,16 @@
+import { getExtension } from '@/lib/paths';
+
 export enum SizableImageAction {
     Resize = 'resize',
     Skip = 'skip',
     Passthrough = 'passthrough',
 }
 
+/**
+ * https://developers.cloudflare.com/images/transform-images/#supported-input-formats
+ */
+const SUPPORTED_IMAGE_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.gif', '.webp'];
+
 /**
  * Check if an image URL is resizable.
  * Skip it for non-http(s) URLs (data, etc).
@@ -25,9 +32,12 @@ export function checkIsSizableImageURL(input: string): SizableImageAction {
     if (parsed.pathname.includes('/~gitbook/image')) {
         return SizableImageAction.Skip;
     }
-    if (parsed.pathname.endsWith('.svg') || parsed.pathname.endsWith('.avif')) {
-        return SizableImageAction.Passthrough;
+
+    const extension = getExtension(parsed.pathname).toLowerCase();
+    if (!extension || SUPPORTED_IMAGE_EXTENSIONS.includes(extension)) {
+        // If no extension, we consider it resizable.
+        return SizableImageAction.Resize;
     }
 
-    return SizableImageAction.Resize;
+    return SizableImageAction.Passthrough;
 }
diff --git a/packages/gitbook/src/components/DocumentView/Embed.tsx b/packages/gitbook/src/components/DocumentView/Embed.tsx
index 796cdaeee..17849c195 100644
--- a/packages/gitbook/src/components/DocumentView/Embed.tsx
+++ b/packages/gitbook/src/components/DocumentView/Embed.tsx
@@ -6,6 +6,7 @@ import { Card } from '@/components/primitives';
 import { tcls } from '@/lib/tailwind';
 
 import { getDataOrNull } from '@v2/lib/data';
+import { Image } from '../utils';
 import type { BlockProps } from './Block';
 import { Caption } from './Caption';
 import { IntegrationBlock } from './Integration';
@@ -52,7 +53,14 @@ export async function Embed(props: BlockProps<gitbookAPI.DocumentBlockEmbed>) {
                 <Card
                     leadingIcon={
                         embed.icon ? (
-                            <img src={embed.icon} className={tcls('w-5', 'h-5')} alt="Logo" />
+                            <Image
+                                src={embed.icon}
+                                className={tcls('w-5', 'h-5')}
+                                alt="Logo"
+                                sources={{ light: { src: embed.icon } }}
+                                sizes={[{ width: 20 }]}
+                                resize={context.contentContext.imageResizer}
+                            />
                         ) : null
                     }
                     href={block.data.url}
diff --git a/packages/gitbook/src/lib/paths.test.ts b/packages/gitbook/src/lib/paths.test.ts
new file mode 100644
index 000000000..1d418f498
--- /dev/null
+++ b/packages/gitbook/src/lib/paths.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, it } from 'bun:test';
+import { getExtension } from './paths';
+
+describe('getExtension', () => {
+    it('should return the extension of a path', () => {
+        expect(getExtension('test.txt')).toBe('.txt');
+    });
+
+    it('should return an empty string if there is no extension', () => {
+        expect(getExtension('test/path/to/file')).toBe('');
+    });
+
+    it('should return the extension of a path with multiple dots', () => {
+        expect(getExtension('test.with.multiple.dots.txt')).toBe('.txt');
+    });
+});
diff --git a/packages/gitbook/src/lib/paths.ts b/packages/gitbook/src/lib/paths.ts
index eff69a569..ebdf35cd3 100644
--- a/packages/gitbook/src/lib/paths.ts
+++ b/packages/gitbook/src/lib/paths.ts
@@ -57,3 +57,15 @@ export function withTrailingSlash(pathname: string): string {
 
     return pathname;
 }
+
+/**
+ * Get the extension of a path.
+ */
+export function getExtension(path: string): string {
+    const re = /\.[0-9a-z]+$/i;
+    const match = path.match(re);
+    if (match) {
+        return match[0];
+    }
+    return '';
+}