diff --git a/packages/platform-server/src/platform-server.ts b/packages/platform-server/src/platform-server.ts
index ffb56751c0..b67f16a5a2 100644
--- a/packages/platform-server/src/platform-server.ts
+++ b/packages/platform-server/src/platform-server.ts
@@ -8,7 +8,7 @@
 
 export {PlatformState} from './platform_state';
 export {ServerModule, platformDynamicServer, platformServer} from './server';
-export {INITIAL_CONFIG, PlatformConfig} from './tokens';
+export {BEFORE_APP_SERIALIZED, INITIAL_CONFIG, PlatformConfig} from './tokens';
 export {renderModule, renderModuleFactory} from './utils';
 
 export * from './private_export';
diff --git a/packages/platform-server/src/tokens.ts b/packages/platform-server/src/tokens.ts
index c212a96668..f1369d6e22 100644
--- a/packages/platform-server/src/tokens.ts
+++ b/packages/platform-server/src/tokens.ts
@@ -24,3 +24,12 @@ export interface PlatformConfig {
  * @experimental
  */
 export const INITIAL_CONFIG = new InjectionToken<PlatformConfig>('Server.INITIAL_CONFIG');
+
+/**
+ * A function that will be executed when calling `renderModuleFactory` or `renderModule` just
+ * before current platform state is rendered to string.
+ *
+ * @experimental
+ */
+export const BEFORE_APP_SERIALIZED =
+    new InjectionToken<Array<() => void>>('Server.RENDER_MODULE_HOOK');
diff --git a/packages/platform-server/src/utils.ts b/packages/platform-server/src/utils.ts
index b26593aa23..1ec9117889 100644
--- a/packages/platform-server/src/utils.ts
+++ b/packages/platform-server/src/utils.ts
@@ -14,7 +14,7 @@ import {toPromise} from 'rxjs/operator/toPromise';
 
 import {PlatformState} from './platform_state';
 import {platformDynamicServer, platformServer} from './server';
-import {INITIAL_CONFIG} from './tokens';
+import {BEFORE_APP_SERIALIZED, INITIAL_CONFIG} from './tokens';
 
 interface PlatformOptions {
   document?: string;
@@ -45,7 +45,22 @@ the server-rendered app can be properly bootstrapped into a client app.`);
     return toPromise
         .call(first.call(filter.call(applicationRef.isStable, (isStable: boolean) => isStable)))
         .then(() => {
-          const output = platform.injector.get(PlatformState).renderToString();
+          const platformState = platform.injector.get(PlatformState);
+
+          // Run any BEFORE_APP_SERIALIZED callbacks just before rendering to string.
+          const callbacks = moduleRef.injector.get(BEFORE_APP_SERIALIZED, null);
+          if (callbacks) {
+            for (const callback of callbacks) {
+              try {
+                callback();
+              } catch (e) {
+                // Ignore exceptions.
+                console.warn('Ignoring BEFORE_APP_SERIALIZED Exception: ', e);
+              }
+            }
+          }
+
+          const output = platformState.renderToString();
           platform.destroy();
           return output;
         });
diff --git a/packages/platform-server/test/integration_spec.ts b/packages/platform-server/test/integration_spec.ts
index 2e73010975..b6a2a75d2e 100644
--- a/packages/platform-server/test/integration_spec.ts
+++ b/packages/platform-server/test/integration_spec.ts
@@ -16,7 +16,7 @@ import {Http, HttpModule, Response, ResponseOptions, XHRBackend} from '@angular/
 import {MockBackend, MockConnection} from '@angular/http/testing';
 import {BrowserModule, DOCUMENT, Title} from '@angular/platform-browser';
 import {getDOM} from '@angular/platform-browser/src/dom/dom_adapter';
-import {INITIAL_CONFIG, PlatformState, ServerModule, platformDynamicServer, renderModule, renderModuleFactory} from '@angular/platform-server';
+import {BEFORE_APP_SERIALIZED, INITIAL_CONFIG, PlatformState, ServerModule, platformDynamicServer, renderModule, renderModuleFactory} from '@angular/platform-server';
 import {Subscription} from 'rxjs/Subscription';
 import {filter} from 'rxjs/operator/filter';
 import {first} from 'rxjs/operator/first';
@@ -38,6 +38,50 @@ class MyServerApp {
 class ExampleModule {
 }
 
+function getTitleRenderHook(doc: any) {
+  return () => {
+    // Set the title as part of the render hook.
+    doc.title = 'RenderHook';
+  };
+}
+
+function exceptionRenderHook() {
+  throw new Error('error');
+}
+
+function getMetaRenderHook(doc: any) {
+  return () => {
+    // Add a meta tag before rendering the document.
+    const metaElement = doc.createElement('meta');
+    metaElement.setAttribute('name', 'description');
+    doc.head.appendChild(metaElement);
+  };
+}
+
+@NgModule({
+  bootstrap: [MyServerApp],
+  declarations: [MyServerApp],
+  imports: [BrowserModule.withServerTransition({appId: 'render-hook'}), ServerModule],
+  providers: [
+    {provide: BEFORE_APP_SERIALIZED, useFactory: getTitleRenderHook, multi: true, deps: [DOCUMENT]},
+  ]
+})
+class RenderHookModule {
+}
+
+@NgModule({
+  bootstrap: [MyServerApp],
+  declarations: [MyServerApp],
+  imports: [BrowserModule.withServerTransition({appId: 'render-hook'}), ServerModule],
+  providers: [
+    {provide: BEFORE_APP_SERIALIZED, useFactory: getTitleRenderHook, multi: true, deps: [DOCUMENT]},
+    {provide: BEFORE_APP_SERIALIZED, useValue: exceptionRenderHook, multi: true},
+    {provide: BEFORE_APP_SERIALIZED, useFactory: getMetaRenderHook, multi: true, deps: [DOCUMENT]},
+  ]
+})
+class MultiRenderHookModule {
+}
+
 @Component({selector: 'app', template: `Works too!`})
 class MyServerApp2 {
 }
@@ -469,6 +513,28 @@ export function main() {
              called = true;
            });
          }));
+
+      it('should call render hook', async(() => {
+           renderModule(RenderHookModule, {document: doc}).then(output => {
+             // title should be added by the render hook.
+             expect(output).toBe(
+                 '<html><head><title>RenderHook</title></head><body>' +
+                 '<app ng-version="0.0.0-PLACEHOLDER">Works!</app></body></html>');
+             called = true;
+           });
+         }));
+
+      it('should call mutliple render hooks', async(() => {
+           const consoleSpy = spyOn(console, 'warn');
+           renderModule(MultiRenderHookModule, {document: doc}).then(output => {
+             // title should be added by the render hook.
+             expect(output).toBe(
+                 '<html><head><title>RenderHook</title><meta name="description"></head>' +
+                 '<body><app ng-version="0.0.0-PLACEHOLDER">Works!</app></body></html>');
+             expect(consoleSpy).toHaveBeenCalled();
+             called = true;
+           });
+         }));
     });
 
     describe('http', () => {
diff --git a/tools/public_api_guard/platform-server/index.d.ts b/tools/public_api_guard/platform-server/index.d.ts
index 4a0495b6da..242d062904 100644
--- a/tools/public_api_guard/platform-server/index.d.ts
+++ b/tools/public_api_guard/platform-server/index.d.ts
@@ -1,3 +1,6 @@
+/** @experimental */
+export declare const BEFORE_APP_SERIALIZED: InjectionToken<(() => void)[]>;
+
 /** @experimental */
 export declare const INITIAL_CONFIG: InjectionToken<PlatformConfig>;