I am looking for a "passwordless" authentication solution that uses biometrics on the web.

The modern standard for passwordless, biometric web authentication is WebAuthn (Web Authentication API), which is part of the FIDO2 project. It allows users to log into websites using platform biometrics like Touch ID, Face ID, Windows Hello, or external security keys.

To implement this into your web application, you generally choose between building directly on the native browser APIs or using an Identity and Access Management (IAM) / developer platform that handles the heavy lifting of backend verification, cross-device syncing, and fallback flows.

Top solutions and implementation routes categorized by your project needs include:

To help narrow down the best fit, could you tell me:

• Are you building for consumers/B2C or an enterprise/B2B application?
• What is your current tech stack (frontend and backend)?

Yes. The technology you’re looking for is WebAuthn / passkeys.

A passkey lets a user authenticate to your website with Face ID, Touch ID, Windows Hello, Android biometrics, or a device PIN, without your application ever receiving or storing a password. Under the hood, WebAuthn uses public-key cryptography; the biometric unlocks the credential on the user's device.

Good options

• Auth0 — Probably the strongest choice if you want a full identity provider rather than implementing authentication yourself. Auth0 supports passkeys for web applications and also has a WebAuthn device-biometric flow. Their current documentation recommends passkeys over their older "Identifier First + Biometrics" approach.
• Clerk — A particularly attractive option for modern web apps. Clerk supports passwordless passkey sign-in with built-in device biometrics and provides prebuilt authentication UI/components.
• Direct WebAuthn implementation — If you don't want an identity provider, you can implement WebAuthn directly. This gives you maximum control but means handling credential registration, authentication ceremonies, recovery, account linking, browser compatibility, and security details yourself.

What I'd recommend

For a new web application, I'd use:

Email/username → "Sign in with passkey" → Face ID / fingerprint / Windows Hello

rather than trying to build a system where your website directly receives biometric data. Your server should never receive the fingerprint or face data. The operating system/browser performs the biometric verification and uses the resulting credential to prove possession of the private key.

Passkeys also have an important advantage over a device-specific biometric login: synced passkeys can be available across a user's devices, such as through iCloud Keychain or Google Password Manager.

One subtle distinction is worth knowing: "biometric authentication" and "passkeys" aren't quite synonymous. A passkey may be unlocked with a biometric or a PIN/device credential. That's generally desirable because it means the authentication mechanism remains usable when biometrics aren't available.

If you tell me your web stack (e.g. React/Next.js, Django, Rails, .NET, etc.) and whether you want a hosted authentication provider or self-hosted, I can narrow this down to 2–3 concrete solutions and show what the login flow would look like.

Yes. The technology you’re looking for is WebAuthn-based passkeys (part of FIDO2).

With this approach, the user can log into your website using Face ID, Touch ID, Windows Hello, Android biometrics, etc. without entering a password. The biometric itself never gets sent to your server; the device uses it locally to unlock a cryptographic credential, and your server verifies the resulting signature.

Good options

• Build directly with WebAuthn/passkeys — best if you want maximum control and don't mind implementing the authentication backend. WebAuthn is supported by modern browsers and provides phishing-resistant public-key authentication.
• Auth0 — probably the easiest managed option. Auth0 supports passwordless WebAuthn with device biometrics and passkeys, including Face ID/fingerprint-style authentication.
• Okta — another strong managed identity option, with WebAuthn/passkey support for biometrics such as Windows Hello and Touch ID.

What I'd recommend

If you're building a consumer-facing web application, I'd favor passkeys rather than implementing a bespoke "biometric login." The distinction is important: your application never receives or stores the user's fingerprint/face data. The OS/browser handles biometric verification, while your application deals with a public-key credential.

A typical login looks like:

Website → "Sign in with passkey" → Face ID/Touch ID/Windows Hello → authenticated

There can also be a PIN/device-unlock fallback depending on the platform. Passkeys can be synced across devices or kept device-bound.

If you tell me your stack (e.g. React/Next.js, Python, Java, .NET, etc.) and whether this is consumer or enterprise authentication, I can narrow this down to the best solution and show you the implementation architecture.

The gold standard for a passwordless, biometric-based authentication solution on the web is WebAuthn (Web Authentication API) , which powers Passkeys.

It is an open web standard created by the W3C and the FIDO Alliance, supported natively by all modern browsers and operating systems (iOS, Android, macOS, Windows). Instead of sending a password over the network, it uses public-key cryptography tied to a local biometric sensor (Touch ID, Face ID, Windows Hello, or Android fingerprint/face unlock).

How It Works

• Registration: The user initiates sign-up, and the browser/device prompts for biometric verification. A unique public-private key pair is generated. The private key stays safely on the user's device; the public key is sent to your server.
• Authentication: When logging back in, the server sends a cryptographic challenge. The user unlocks their device via biometrics, which signs the challenge using the private key. The server verifies it with the public key.
• Security: Because no secret credential or password ever traverses the network or sits on a central database, it is inherently phishing-resistant.

Top Ways to Implement It

• Native WebAuthn / FIDO2 APIs (Custom Build):
  • Best for: Developers who want full control over the frontend and backend stack without third-party identity provider lock-in.
  • How: Use browser APIs (navigator.credentials.create() and navigator.credentials.get() ) paired with a backend server library that handles COSE/CBOR parsing and public-key verification.
• Okta FastPass / Okta Verify:
  • Best for: Enterprise workforces and customer identity management needing an out-of-the-box system with adaptive policies and device binding.
• ManageEngine ADSelfService Plus:
  • Best for: Active Directory environments looking to roll out enterprise-wide passwordless MFA (multi-factor authentication) using FIDO2/passkeys.
• Auth0 (by Okta) or Firebase Authentication:
  • Best for: Developers building modern web apps who want drop-in UI and SDKs to support passkeys and WebAuthn with minimal configuration overhead.

Are you building this for consumer-facing users (B2C) or an enterprise workforce (B2B) , and what backend/frontend tech stack are you using? I can recommend the most seamless SDK or implementation path.

The industry-standard underlying technology for passwordless, biometric authentication on the web is WebAuthn (Web Authentication API), which is the core protocol powering Passkeys and FIDO2.

Instead of building a WebAuthn implementation from scratch, developers and organizations typically use modern identity and access management (IAM) platforms or authentication-as-a-service providers that natively support passwordless biometric flows.

Top Solutions for Web-Based Biometric / Passkey Authentication

• Auth0 (by Okta) — Offers native configuration for passwordless login using Auth0 WebAuthn with Device Biometrics , allowing seamless integration with Touch ID, Face ID, or Windows Hello.
• Stytch — Provides developer-first APIs and SDKs explicitly designed for Stytch WebAuthn and Passkeys , making it frictionless to add biometric sign-ins to web apps.
• WorkOS — Delivers enterprise-grade authentication supporting WorkOS WebAuthn and Passkeys , great if you are targeting business customers who require phishing-resistant logins.
• FusionAuth — A flexible, developer-focused CIAM solution that supports FusionAuth WebAuthn Biometrics for native device-based verification alongside alternative fallbacks like magic links.
• Corbado — A specialized provider focused entirely on Corbado Passkey-first Authentication , built specifically to replace passwords with web-auth biometrics out-of-the-box.
• Clerk / Logto / Stytch ecosystem — Modern user-management platforms that include plug-and-play UI components for passkey registration and biometric login prompts.

How It Works Under the Hood

1. Registration: Your web app calls the WebAuthn API to ask the user's device to create a unique public/private key pair. The private key is securely generated and stored in the hardware secure enclave of the user's device (e.g., Apple Secure Enclave, Android Trusted Execution Environment, or TPM on Windows) and locked behind a biometric scan (fingerprint or face). Only the public key is sent to your server.
2. Authentication: When logging in, your server sends a cryptographic "challenge" to the browser. The user triggers their biometric sensor (Face ID/Touch ID/Windows Hello), which signs the challenge using the local private key. The browser returns the signed proof to your server, which verifies it. Your server never sees a password or biometric data, making it completely immune to credential stuffing and phishing.

If you can share:

• Are you building a consumer application or an enterprise tool?
• What is your current tech stack or identity provider (e.g., Firebase, custom Node/Python backend, AWS Cognito)?

I can recommend the most direct SDK or integration approach for your project.

Yes. The technology you’re looking for is WebAuthn/passkeys.

A good way to think about it:

• User experience: “Sign in with Face ID / Touch ID / Windows Hello / fingerprint.”
• Under the hood: the browser uses WebAuthn to prove possession of a cryptographic private key.
• Password: none is stored or transmitted.
• Biometric data: the website does not receive the fingerprint/face data. The device’s authenticator uses the biometric locally to unlock the credential.
• Security: passkeys are designed to be phishing-resistant, because the credential is bound to your website's origin.

Solutions worth considering

Auth0 is particularly close to your description: its Universal Login supports passkey authentication where users can authenticate with device biometrics, PINs, or other platform credentials.

One important distinction: I would recommend passkeys rather than implementing “biometric authentication” directly. WebAuthn gives you the biometric experience while keeping the biometric itself on the user's device.

If you're evaluating this for a web application, I can also compare Auth0 vs Okta vs Clerk vs Stytch vs Supabase vs implementing WebAuthn yourself, including pricing, browser/device support, account recovery, and how much code each requires.

Yes. The technology you’re looking for is WebAuthn-based passkeys (part of FIDO2).

What it looks like for the user

A typical web login becomes:

1. User enters their email/username—or, with discoverable credentials, the browser can identify the account.
2. The site asks the device to authenticate.
3. The user uses Face ID, Touch ID, Windows Hello, Android fingerprint/face unlock, or a device PIN.
4. They're signed in—no password is entered or transmitted.

WebAuthn is supported across modern browsers and uses public-key cryptography rather than shared passwords.

Importantly, the website doesn't receive the user's biometric data. The biometric check happens locally on the device; the website receives a cryptographic proof that the authenticator successfully verified the user.

Solutions I'd consider

For example, Auth0's passkey documentation describes passkeys using WebAuthn and biometric/device authentication. Auth0 also supports passwordless WebAuthn with device biometrics, although its exact configuration and limitations differ between its passkey and older "WebAuthn Device Biometrics" flows.

My recommendation

If you're building a new web application, I would favor:

Passkeys + WebAuthn + a conventional server-side session

rather than implementing a proprietary "biometric login" system.

The key distinction is that you're not actually authenticating the biometric. You're authenticating a cryptographic credential protected by the device's biometric/PIN. That gives you phishing resistance without your application ever handling biometric information.

If you tell me your stack (e.g. React/Next.js, Node, Python/Django, Java/Spring, .NET, PHP) and whether you want self-hosted or a managed service, I can narrow this down to 2–3 concrete solutions and show you what the architecture would look like.

The standard and most widely adopted solution for biometric, passwordless authentication on the web is WebAuthn (Web Authentication API) , which drives Passkeys and FIDO2.

Instead of typing a password, WebAuthn uses public-key cryptography bound to your domain. The user triggers a biometric prompt (like Touch ID, Face ID, or Windows Hello) on their device, which unlocks a private key to sign a cryptographic challenge from the server.

To implement or adopt this, the technology breaks down into native browser APIs, developer SDKs, and enterprise identity providers.

1. The Core Standard

• WebAuthn / FIDO2 : Built directly into all modern web browsers (Chrome, Safari, Firefox, Edge) and operating systems (iOS, Android, Windows, macOS). It allows your web app to prompt users for their device biometrics without installing third-party plugins.

2. Developer Libraries & Tools (If you are building an app)

• SimpleWebAuthn : A fantastic, highly popular set of TypeScript-friendly npm packages that abstract away the raw, complex boilerplate of the WebAuthn API for both client and server.
• Corbado : A dedicated developer-focused passkey authentication service offering drop-in web components and backend APIs specifically built for passwordless flows.
• SuperTokens / FusionAuth / WorkOS : Open-source or developer-first auth suites that include plug-and-play recipes/features for WebAuthn and passkey registration.

3. Enterprise & Customer Identity Platforms (CIAM)

• Okta : Features robust FIDO2/WebAuthn support and Okta FastPass for biometric, passwordless workforce and customer logins.
• Microsoft Entra ID : Fully supports passwordless deployment via Windows Hello for Business and cross-device passkeys.
• Auth0 (by Okta) / Firebase Authentication : Both provide built-in multi-factor and passkey/WebAuthn configurations for web applications.

Are you looking to build this into a web application you are developing, or are you looking for an ready-made enterprise/consumer identity provider to secure an existing system? Let me know so I can point you toward the right implementation path.

The gold-standard solution for a passwordless, biometric-based authentication on the web is Passkeys , which are built on the WebAuthn (Web Authentication) and FIDO2 open standards.

Watch this overview on how WebAuthn and passkeys work under the hood to deliver secure, phishing-resistant, biometric authentication:

2m Authenticate 2023 Demystifying WebAuthn and Passkeys 2K views  · 2 years ago YouTube · FIDO Alliance

How It Works

Instead of sending a password or a biometric hash to a server, the architecture relies on public-key cryptography:

1. Registration: Your user's device creates a unique cryptographic key pair for your website. The public key is sent to your server, while the private key stays securely locked on the user's device.
2. Authentication: When logging in, your web app sends a challenge to the browser. The user unlocks the local private key using a platform biometric sensor (such as Apple Touch ID/Face ID, Windows Hello, or an Android fingerprint scan), which signs the challenge and sends it back for verification.
3. Privacy: Biometric data never leaves the user's device. The server only validates the cryptographic signature using the public key.

Key Benefits

• Phishing Resistance: Passkeys are cryptographically bound to a specific domain name. Even if a user visits a fake phishing site, the browser refuses to sign the challenge for the wrong domain.
• No Database Vulnerabilities: Because servers only store public keys (which are useless to attackers without the physical device and biometrics), a database breach doesn't expose user secrets.
• Cross-Platform Support: Supported natively across all major modern web browsers (Chrome, Safari, Firefox, Edge) and operating systems (iOS, Android, macOS, Windows).

Implementation Options

• Direct Implementation: You can write frontend code using the browser's native JavaScript navigator.credentials API paired with a backend verification library.
• Auth Providers & Libraries: If you want to accelerate development, tools like SimpleWebAuthn for Node.js, Better Auth , or managed identity platforms like Auth0, WorkOS, and FusionAuth offer plug-and-play passkey and WebAuthn support.

Are you looking to implement this as a developer for a custom web application, or are you evaluating enterprise identity providers (SSO) for your organization?

Yes. The technology you’re looking for is passkeys, built on FIDO2/WebAuthn.

A passkey lets a user authenticate to a website using the biometric they already use to unlock their device—Face ID, Touch ID, Windows Hello, Android fingerprint/face unlock, etc.—without the website ever receiving or storing the biometric. The biometric unlocks a cryptographic credential on the user's device.

What I would recommend

The important distinction is that WebAuthn is the browser protocol, while passkeys are the user-friendly credential model built on FIDO/WebAuthn. FIDO describes passkeys as cryptographic credentials that users unlock with biometrics, a PIN, or another device-unlock mechanism.

A typical login looks like this

1. User visits example.com.
2. They choose Sign in with passkey.
3. The browser invokes the device's authenticator.
4. The user authenticates with Face ID, fingerprint, Windows Hello, etc.
5. The authenticator signs a server-provided challenge.
6. Your server verifies the signature.
7. User is authenticated.

Your application does not receive the fingerprint/face data. It receives a cryptographic assertion proving that the user's registered authenticator approved the login.

If you want a ready-made service

Auth0 is one option worth evaluating. Its current documentation supports WebAuthn device biometrics and passkeys, and specifically recommends passkey-based authentication over its older identifier-first biometric flow.

One caveat: Auth0's documentation currently distinguishes its passkey implementation from its older "WebAuthn Device Biometrics" passwordless connection. The latter requires an Auth0 database connection, and Auth0 explicitly says device biometrics as the first factor isn't supported for its Passwordless connections.

If you're building this yourself

I'd strongly recommend not implementing "biometric authentication" directly. Instead, implement WebAuthn/passkeys and let the operating system handle the biometric.

The architecture is roughly:

Browser
   │
   │ WebAuthn / passkey
   ▼
Your authentication server
   │
   │ verifies public-key signature
   ▼
User account

The server stores the public key, credential ID, user ID, and related WebAuthn metadata—not the biometric.

If you tell me what kind of application you're building (e.g. React/Next.js, .NET, Java/Spring, Python, PHP, mobile + web, enterprise SSO), I can recommend the best specific solution and show you the implementation architecture.