diff --git a/packages/ui/src/App.tsx b/packages/ui/src/App.tsx
index ebc4dc295..51d8e2d53 100644
--- a/packages/ui/src/App.tsx
+++ b/packages/ui/src/App.tsx
@@ -1,3 +1,4 @@
+import { SignInMode } from '@logto/schemas';
 import { useEffect } from 'react';
 import { Route, Routes, BrowserRouter, Navigate } from 'react-router-dom';
 
@@ -50,6 +51,9 @@ const App = () => {
     return null;
   }
 
+  const isRegisterOnly = experienceSettings.signInMode === SignInMode.Register;
+  const isSignInOnly = experienceSettings.signInMode === SignInMode.SignIn;
+
   return (
     <Provider value={context}>
       <AppContent>
@@ -64,13 +68,19 @@ const App = () => {
 
             <Route element={<LoadingLayerProvider />}>
               {/* sign-in */}
-              <Route path="/sign-in" element={<SignIn />} />
+              <Route
+                path="/sign-in"
+                element={isRegisterOnly ? <Navigate replace to="/register" /> : <SignIn />}
+              />
               <Route path="/sign-in/social/:connector" element={<SocialSignIn />} />
               <Route path="/sign-in/:method" element={<SecondarySignIn />} />
               <Route path="/sign-in/:method/password" element={<SignInPassword />} />
 
               {/* register */}
-              <Route path="/register" element={<Register />} />
+              <Route
+                path="/register"
+                element={isSignInOnly ? <Navigate replace to="/sign-in" /> : <Register />}
+              />
               <Route
                 path="/register/username/password"
                 element={<PasswordRegisterWithUsername />}
diff --git a/packages/ui/src/hooks/use-sie.ts b/packages/ui/src/hooks/use-sie.ts
index fa3a48a13..cc9c75a27 100644
--- a/packages/ui/src/hooks/use-sie.ts
+++ b/packages/ui/src/hooks/use-sie.ts
@@ -11,5 +11,6 @@ export const useSieMethods = () => {
     signUpSettings: { password, verify },
     signInMethods: experienceSettings?.signIn.methods ?? [],
     socialConnectors: experienceSettings?.socialConnectors ?? [],
+    signInMode: experienceSettings?.signInMode,
   };
 };
diff --git a/packages/ui/src/hooks/use-social-sign-in-listener.ts b/packages/ui/src/hooks/use-social-sign-in-listener.ts
index 17aa2732f..57cb5f90a 100644
--- a/packages/ui/src/hooks/use-social-sign-in-listener.ts
+++ b/packages/ui/src/hooks/use-social-sign-in-listener.ts
@@ -1,3 +1,4 @@
+import { SignInMode } from '@logto/schemas';
 import { useEffect, useCallback, useContext, useMemo } from 'react';
 import { useTranslation } from 'react-i18next';
 import { useParams, useNavigate } from 'react-router-dom';
@@ -11,7 +12,8 @@ import useApi from './use-api';
 import { PageContext } from './use-page-context';
 
 const useSocialSignInListener = () => {
-  const { setToast } = useContext(PageContext);
+  const { setToast, experienceSettings } = useContext(PageContext);
+
   const { t } = useTranslation();
   const parameters = useParams();
   const navigate = useNavigate();
@@ -19,6 +21,13 @@ const useSocialSignInListener = () => {
   const signInWithSocialErrorHandlers: ErrorHandlers = useMemo(
     () => ({
       'user.identity_not_exists': (error) => {
+        // Should not let user register under sign-in only mode
+        if (experienceSettings?.signInMode === SignInMode.SignIn) {
+          setToast(error.message);
+
+          return;
+        }
+
         if (parameters.connector) {
           navigate(`/social/register/${parameters.connector}`, {
             replace: true,
@@ -27,7 +36,7 @@ const useSocialSignInListener = () => {
         }
       },
     }),
-    [navigate, parameters.connector]
+    [experienceSettings?.signInMode, navigate, parameters.connector, setToast]
   );
 
   const { result, run: asyncSignInWithSocial } = useApi(
diff --git a/packages/ui/src/pages/Register/index.test.tsx b/packages/ui/src/pages/Register/index.test.tsx
index 7dcc2a6c0..34be5a739 100644
--- a/packages/ui/src/pages/Register/index.test.tsx
+++ b/packages/ui/src/pages/Register/index.test.tsx
@@ -1,4 +1,4 @@
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInMode, SignInIdentifier } from '@logto/schemas';
 import { MemoryRouter } from 'react-router-dom';
 
 import renderWithPageContext from '@/__mocks__/RenderWithPageContext';
@@ -99,4 +99,18 @@ describe('<Register />', () => {
       mockSignInExperienceSettings.socialConnectors.length
     );
   });
+
+  test('render with sign-in only mode should return ErrorPage', () => {
+    const { queryByText } = renderWithPageContext(
+      <SettingsProvider
+        settings={{ ...mockSignInExperienceSettings, signInMode: SignInMode.SignIn }}
+      >
+        <MemoryRouter>
+          <Register />
+        </MemoryRouter>
+      </SettingsProvider>
+    );
+
+    expect(queryByText('description.not_found')).not.toBeNull();
+  });
 });
diff --git a/packages/ui/src/pages/Register/index.tsx b/packages/ui/src/pages/Register/index.tsx
index 2c374f50b..b4db9f3b9 100644
--- a/packages/ui/src/pages/Register/index.tsx
+++ b/packages/ui/src/pages/Register/index.tsx
@@ -1,3 +1,4 @@
+import { SignInMode } from '@logto/schemas';
 import { useTranslation } from 'react-i18next';
 
 import Divider from '@/components/Divider';
@@ -8,14 +9,19 @@ import { SocialSignInList } from '@/containers/SocialSignIn';
 import { useSieMethods } from '@/hooks/use-sie';
 import { UserFlow } from '@/types';
 
+import ErrorPage from '../ErrorPage';
 import Main from './Main';
 import * as styles from './index.module.scss';
 
 const Register = () => {
-  const { signUpMethods, socialConnectors } = useSieMethods();
+  const { signUpMethods, socialConnectors, signInMode } = useSieMethods();
   const otherMethods = signUpMethods.slice(1);
   const { t } = useTranslation();
 
+  if (!signInMode || signInMode === SignInMode.SignIn) {
+    return <ErrorPage />;
+  }
+
   return (
     <LandingPageContainer>
       <Main signUpMethod={signUpMethods[0]} socialConnectors={socialConnectors} />
@@ -40,7 +46,7 @@ const Register = () => {
       }
       {
         // SignIn footer
-        signUpMethods.length > 0 && (
+        signInMode === SignInMode.SignInAndRegister && signUpMethods.length > 0 && (
           <>
             <div className={styles.placeHolder} />
             <div className={styles.createAccount}>
diff --git a/packages/ui/src/pages/SecondaryRegister/index.test.tsx b/packages/ui/src/pages/SecondaryRegister/index.test.tsx
index 7cf02d370..5344c6e7d 100644
--- a/packages/ui/src/pages/SecondaryRegister/index.test.tsx
+++ b/packages/ui/src/pages/SecondaryRegister/index.test.tsx
@@ -1,4 +1,4 @@
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInIdentifier, SignInMode } from '@logto/schemas';
 import { Routes, Route, MemoryRouter } from 'react-router-dom';
 
 import renderWithPageContext from '@/__mocks__/RenderWithPageContext';
@@ -86,7 +86,7 @@ describe('<SecondaryRegister />', () => {
   });
 
   test('renders non-supported signUp methods should return error page', () => {
-    const { queryByText, container } = renderWithPageContext(
+    const { queryByText } = renderWithPageContext(
       <MemoryRouter initialEntries={['/register/email']}>
         <Routes>
           <Route
@@ -105,7 +105,7 @@ describe('<SecondaryRegister />', () => {
   });
 
   test('render non-verified passwordless methods should return error page', () => {
-    const { queryByText, container } = renderWithPageContext(
+    const { queryByText } = renderWithPageContext(
       <MemoryRouter initialEntries={['/register/email']}>
         <Routes>
           <Route
@@ -131,4 +131,28 @@ describe('<SecondaryRegister />', () => {
     expect(queryByText('action.create_account')).toBeNull();
     expect(queryByText('description.not_found')).not.toBeNull();
   });
+
+  test('render with sign-in only mode', () => {
+    const { queryByText } = renderWithPageContext(
+      <MemoryRouter initialEntries={['/register/email']}>
+        <Routes>
+          <Route
+            path="/register/:method"
+            element={
+              <SettingsProvider
+                settings={{
+                  ...mockSignInExperienceSettings,
+                  signInMode: SignInMode.SignIn,
+                }}
+              >
+                <SecondaryRegister />
+              </SettingsProvider>
+            }
+          />
+        </Routes>
+      </MemoryRouter>
+    );
+    expect(queryByText('action.create_account')).toBeNull();
+    expect(queryByText('description.not_found')).not.toBeNull();
+  });
 });
diff --git a/packages/ui/src/pages/SecondaryRegister/index.tsx b/packages/ui/src/pages/SecondaryRegister/index.tsx
index da8791a9e..3d59f749e 100644
--- a/packages/ui/src/pages/SecondaryRegister/index.tsx
+++ b/packages/ui/src/pages/SecondaryRegister/index.tsx
@@ -1,4 +1,4 @@
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInMode, SignInIdentifier } from '@logto/schemas';
 import { useParams } from 'react-router-dom';
 import { is } from 'superstruct';
 
@@ -16,7 +16,11 @@ type Parameters = {
 
 const SecondaryRegister = () => {
   const { method = '' } = useParams<Parameters>();
-  const { signUpMethods, signUpSettings } = useSieMethods();
+  const { signUpMethods, signUpSettings, signInMode } = useSieMethods();
+
+  if (!signInMode || signInMode === SignInMode.SignIn) {
+    return <ErrorPage />;
+  }
 
   // Validate the signUp method
   if (!is(method, SignInMethodGuard) || !signUpMethods.includes(method)) {
diff --git a/packages/ui/src/pages/SecondarySignIn/index.test.tsx b/packages/ui/src/pages/SecondarySignIn/index.test.tsx
index 8b6752dfe..51be21535 100644
--- a/packages/ui/src/pages/SecondarySignIn/index.test.tsx
+++ b/packages/ui/src/pages/SecondarySignIn/index.test.tsx
@@ -1,4 +1,4 @@
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInIdentifier, SignInMode } from '@logto/schemas';
 import { Routes, Route, MemoryRouter } from 'react-router-dom';
 
 import renderWithPageContext from '@/__mocks__/RenderWithPageContext';
@@ -114,4 +114,28 @@ describe('<SecondarySignIn />', () => {
     expect(queryByText('action.sign_in')).toBeNull();
     expect(queryByText('description.not_found')).not.toBeNull();
   });
+
+  test('render with register only mode', async () => {
+    const { queryByText } = renderWithPageContext(
+      <MemoryRouter initialEntries={['/sign-in/email']}>
+        <Routes>
+          <Route
+            path="/sign-in/:method"
+            element={
+              <SettingsProvider
+                settings={{
+                  ...mockSignInExperienceSettings,
+                  signInMode: SignInMode.Register,
+                }}
+              >
+                <SecondarySignIn />
+              </SettingsProvider>
+            }
+          />
+        </Routes>
+      </MemoryRouter>
+    );
+    expect(queryByText('action.sign_in')).toBeNull();
+    expect(queryByText('description.not_found')).not.toBeNull();
+  });
 });
diff --git a/packages/ui/src/pages/SecondarySignIn/index.tsx b/packages/ui/src/pages/SecondarySignIn/index.tsx
index 210156119..3c4d3d919 100644
--- a/packages/ui/src/pages/SecondarySignIn/index.tsx
+++ b/packages/ui/src/pages/SecondarySignIn/index.tsx
@@ -1,4 +1,4 @@
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInMode, SignInIdentifier } from '@logto/schemas';
 import { useParams } from 'react-router-dom';
 
 import SecondaryPageWrapper from '@/components/SecondaryPageWrapper';
@@ -14,9 +14,13 @@ type Props = {
 
 const SecondarySignIn = () => {
   const { method = '' } = useParams<Props>();
-  const { signInMethods } = useSieMethods();
+  const { signInMethods, signInMode } = useSieMethods();
   const signInMethod = signInMethods.find(({ identifier }) => identifier === method);
 
+  if (!signInMode || signInMode === SignInMode.Register) {
+    return <ErrorPage />;
+  }
+
   if (!signInMethod) {
     return <ErrorPage />;
   }
diff --git a/packages/ui/src/pages/SignIn/index.test.tsx b/packages/ui/src/pages/SignIn/index.test.tsx
index 8d45d4d12..e2d518d76 100644
--- a/packages/ui/src/pages/SignIn/index.test.tsx
+++ b/packages/ui/src/pages/SignIn/index.test.tsx
@@ -1,3 +1,4 @@
+import { SignInMode } from '@logto/schemas';
 import { MemoryRouter } from 'react-router-dom';
 
 import renderWithPageContext from '@/__mocks__/RenderWithPageContext';
@@ -130,4 +131,18 @@ describe('<SignIn />', () => {
       mockSignInExperienceSettings.socialConnectors.length
     );
   });
+
+  test('render with register only mode should return ErrorPage', () => {
+    const { queryByText } = renderWithPageContext(
+      <SettingsProvider
+        settings={{ ...mockSignInExperienceSettings, signInMode: SignInMode.Register }}
+      >
+        <MemoryRouter>
+          <SignIn />
+        </MemoryRouter>
+      </SettingsProvider>
+    );
+
+    expect(queryByText('description.not_found')).not.toBeNull();
+  });
 });
diff --git a/packages/ui/src/pages/SignIn/index.tsx b/packages/ui/src/pages/SignIn/index.tsx
index 59766a671..30a887ad9 100644
--- a/packages/ui/src/pages/SignIn/index.tsx
+++ b/packages/ui/src/pages/SignIn/index.tsx
@@ -1,3 +1,4 @@
+import { SignInMode } from '@logto/schemas';
 import { useTranslation } from 'react-i18next';
 
 import Divider from '@/components/Divider';
@@ -8,14 +9,19 @@ import { SocialSignInList } from '@/containers/SocialSignIn';
 import { useSieMethods } from '@/hooks/use-sie';
 import { UserFlow } from '@/types';
 
+import ErrorPage from '../ErrorPage';
 import Main from './Main';
 import * as styles from './index.module.scss';
 
 const SignIn = () => {
-  const { signInMethods, signUpMethods, socialConnectors } = useSieMethods();
+  const { signInMethods, signUpMethods, socialConnectors, signInMode } = useSieMethods();
   const otherMethods = signInMethods.slice(1).map(({ identifier }) => identifier);
   const { t } = useTranslation();
 
+  if (!signInMode || signInMode === SignInMode.Register) {
+    return <ErrorPage />;
+  }
+
   return (
     <LandingPageContainer>
       <Main signInMethod={signInMethods[0]} socialConnectors={socialConnectors} />
@@ -41,7 +47,7 @@ const SignIn = () => {
       }
       {
         // Create Account footer
-        signUpMethods.length > 0 && (
+        signInMode === SignInMode.SignInAndRegister && signUpMethods.length > 0 && (
           <>
             <div className={styles.placeHolder} />
             <div className={styles.createAccount}>