Secure authentication solutions built for the next generation of apps

Move past standard login screens. Build identity experiences that drive conversion across web, mobile, and agentic apps.

Frequently asked questions

What is Auth0 Authentication?

Auth0 Authentication is a flexible, developer-centric service that supports a wide range of login methods, including username/password, social IDs, enterprise SSO, email/sms passwordless, biometrics via WebAuthN and Passkeys. By using the Auth0 Universal Login, some developers can implement more secure authentication in minutes, helping ensure that user identity is verified against industry-standard protocols like OpenID Connect and SAML 2.0.

What is 'Step-up' authentication in Auth0?

Step-up authentication is a security pattern where Auth0 challenges a user for an additional factor (like MFA) only when they attempt a sensitive action, such as changing a password or making a large purchase. This helps ensure high-value resources are protected without requiring MFA for every low-risk login, balancing security with user convenience.

How does Auth0 handle cross-platform login?

Auth0 provides a unified authentication experience across web, mobile, and desktop applications. By using standardized JWTs (JSON Web Tokens), Auth0 verifies that a user's identity is recognized seamlessly as they move between different platforms in your ecosystem, maintaining a more secure session and a consistent branded experience throughout. Additionally, Auth0 also supports Native to Web SSO, allowing a seamless user experience transitioning authenticated users from your native app to your web app.

Can I customize the Auth0 authentication pipeline?

Yes, the Auth0 authentication pipeline is highly extensible via Auth0 Actions. Developers can write serverless functions to trigger custom logic—such as verifying a user's age, checking a legacy database, or calling a fraud detection API—during the login process, allowing for a fully tailored security and user experience. Complementary to Actions, Auth0 Forms enables developers to use a visual editor to build customizable forms for use cases such as progressive profiling, step-up authentication, and identity verification.

Does Auth0 support biometric authentication?

Yes, Auth0 supports biometric authentication through WebAuthn and Passkeys. This allows users to log into applications using FaceID, TouchID, or Windows Hello. Biometrics provide a phishing-resistant, passwordless experience that is significantly more secure than traditional credentials and offers a frictionless journey for modern mobile and web users.

What is the difference between Universal Login and Embedded Login?

Universal Login and Embedded Login are two key ways to build conversion-friendly identity journeys. Many customers use a hybrid approach, using different solutions for different identity patterns.

Universal Login is Auth0’s hosted identity. It’s the fastest way to roll out secure-by-design identity flows with no-code and pro-code customization options. With Advanced Customization for Universal Login (ACUL), teams can control every pixel of the authentication experience using their own design system, tooling, and existing UI/UX investments—all on top of Auth0’s hosted authentication.

Embedded Login is Auth0’s most flexible option. It lets you integrate identity flows into your application code using Auth0 APIs and SDKs for complete pro-code control. Blend authentication in-app, exactly where users convert. Use Auth0 configurable capabilities and built-in security tooling to reduce security roadblocks and custom code to scale faster.