diff --git a/docs/tool-reference.md b/docs/tool-reference.md
index ad9410a2d..070cd548e 100644
--- a/docs/tool-reference.md
+++ b/docs/tool-reference.md
@@ -200,11 +200,11 @@
 
 ### `emulate_network`
 
-**Description:** Emulates network conditions such as throttling on the selected page.
+**Description:** Emulates network conditions such as throttling or offline mode on the selected page.
 
 **Parameters:**
 
-- **throttlingOption** (enum: "No emulation", "Slow 3G", "Fast 3G", "Slow 4G", "Fast 4G") **(required)**: The network throttling option to emulate. Available throttling options are: No emulation, Slow 3G, Fast 3G, Slow 4G, Fast 4G. Set to "No emulation" to disable.
+- **throttlingOption** (enum: "No emulation", "Offline", "Slow 3G", "Fast 3G", "Slow 4G", "Fast 4G") **(required)**: The network throttling option to emulate. Available throttling options are: No emulation, Offline, Slow 3G, Fast 3G, Slow 4G, Fast 4G. Set to "No emulation" to disable. Set to "Offline" to simulate offline network conditions.
 
 ---
 
diff --git a/package-lock.json b/package-lock.json
index 2435a3f22..77e6717d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,8 +12,9 @@
         "@modelcontextprotocol/sdk": "1.19.1",
         "core-js": "3.45.1",
         "debug": "4.4.3",
-        "puppeteer-core": "24.23.0",
-        "yargs": "18.0.0"
+        "puppeteer-core": "^24.23.0",
+        "yargs": "18.0.0",
+        "zod": "^3.25.76"
       },
       "bin": {
         "chrome-devtools-mcp": "build/src/index.js"
@@ -4735,7 +4736,6 @@
       "version": "24.23.0",
       "resolved": "https://registry.npmjs.org/puppeteer-core/-/puppeteer-core-24.23.0.tgz",
       "integrity": "sha512-yl25C59gb14sOdIiSnJ08XiPP+O2RjuyZmEG+RjYmCXO7au0jcLf7fRiyii96dXGUBW7Zwei/mVKfxMx/POeFw==",
-      "license": "Apache-2.0",
       "dependencies": {
         "@puppeteer/browsers": "2.10.10",
         "chromium-bidi": "9.1.0",
@@ -6194,19 +6194,17 @@
       }
     },
     "node_modules/zod": {
-      "version": "3.24.3",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.3.tgz",
-      "integrity": "sha512-HhY1oqzWCQWuUqvBFnsyrtZRhyPeR7SUGv+C4+MsisMuVfSPx8HpwWqH8tRahSlt6M3PiFAcoeFhZAqIXTxoSg==",
-      "license": "MIT",
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
     },
     "node_modules/zod-to-json-schema": {
-      "version": "3.24.5",
-      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.5.tgz",
-      "integrity": "sha512-/AuWwMP+YqiPbsJx5D6TfgRTc4kTLjsh5SOcd4bLsfUg2RcEXrFMJl1DGgdHy2aCfsIA/cr/1JM0xcB2GZji8g==",
-      "license": "ISC",
+      "version": "3.24.6",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.24.6.tgz",
+      "integrity": "sha512-h/z3PKvcTcTetyjl1fkj79MHNEjm+HpD6NXheWjzOekY7kV+lwDYnHw+ivHkijnCSMz1yJaWBD9vu/Fcmk+vEg==",
       "peerDependencies": {
         "zod": "^3.24.1"
       }
diff --git a/package.json b/package.json
index fe960cf4e..807b8f446 100644
--- a/package.json
+++ b/package.json
@@ -40,8 +40,9 @@
     "@modelcontextprotocol/sdk": "1.19.1",
     "core-js": "3.45.1",
     "debug": "4.4.3",
-    "puppeteer-core": "24.23.0",
-    "yargs": "18.0.0"
+    "puppeteer-core": "^24.23.0",
+    "yargs": "18.0.0",
+    "zod": "^3.25.76"
   },
   "devDependencies": {
     "@eslint/js": "^9.35.0",
diff --git a/src/tools/emulation.ts b/src/tools/emulation.ts
index 9228c59b3..92b949e91 100644
--- a/src/tools/emulation.ts
+++ b/src/tools/emulation.ts
@@ -12,12 +12,13 @@ import {defineTool} from './ToolDefinition.js';
 
 const throttlingOptions: [string, ...string[]] = [
   'No emulation',
+  'Offline',
   ...Object.keys(PredefinedNetworkConditions),
 ];
 
 export const emulateNetwork = defineTool({
   name: 'emulate_network',
-  description: `Emulates network conditions such as throttling on the selected page.`,
+  description: `Emulates network conditions such as throttling or offline mode on the selected page.`,
   annotations: {
     category: ToolCategories.EMULATION,
     readOnlyHint: false,
@@ -26,7 +27,7 @@ export const emulateNetwork = defineTool({
     throttlingOption: z
       .enum(throttlingOptions)
       .describe(
-        `The network throttling option to emulate. Available throttling options are: ${throttlingOptions.join(', ')}. Set to "No emulation" to disable.`,
+        `The network throttling option to emulate. Available throttling options are: ${throttlingOptions.join(', ')}. Set to "No emulation" to disable. Set to "Offline" to simulate offline network conditions.`,
       ),
   },
   handler: async (request, _response, context) => {
@@ -39,6 +40,17 @@ export const emulateNetwork = defineTool({
       return;
     }
 
+    if (conditions === 'Offline') {
+      await page.emulateNetworkConditions({
+        offline: true,
+        download: 0,
+        upload: 0,
+        latency: 0,
+      });
+      context.setNetworkConditions('Offline');
+      return;
+    }
+
     if (conditions in PredefinedNetworkConditions) {
       const networkCondition =
         PredefinedNetworkConditions[
diff --git a/tests/tools/emulation.test.ts b/tests/tools/emulation.test.ts
index 151a621b8..0b64e4847 100644
--- a/tests/tools/emulation.test.ts
+++ b/tests/tools/emulation.test.ts
@@ -11,6 +11,21 @@ import {withBrowser} from '../utils.js';
 
 describe('emulation', () => {
   describe('network', () => {
+    it('emulates offline network conditions', async () => {
+      await withBrowser(async (response, context) => {
+        await emulateNetwork.handler(
+          {
+            params: {
+              throttlingOption: 'Offline',
+            },
+          },
+          response,
+          context,
+        );
+
+        assert.strictEqual(context.getNetworkConditions(), 'Offline');
+      });
+    });
     it('emulates network throttling when the throttling option is valid ', async () => {
       await withBrowser(async (response, context) => {
         await emulateNetwork.handler(