2FA Code Generator - Generate Two-Factor Auth Codes Online

Key Features

What is 2FA and Why Use It?

Two-factor authentication (2FA) adds a second layer of security to your accounts. Even if someone knows your password, they can't log in without the time-based code from your authenticator app. TOTP (Time-based One-Time Password) is the most common 2FA method, used by Google, Facebook, GitHub, and thousands of other services. This tool generates TOTP codes from your secret key — useful when you've lost access to your authenticator app or need to generate codes on a different device.

Benefits

• •Access 2FA codes without your phone
• •Backup code generator for emergencies
• •Supports all TOTP-compatible services
• •Secure — processed entirely in browser
• •Generate new secret keys for new 2FA setups
• •Create OTP Auth URLs for QR code generation

How to Generate 2FA Codes

1. 1Select 'Use Existing Secret' tab and enter your secret key
2. 2Or select 'Generate New' to create a new 2FA setup
3. 3The 6-digit code appears automatically
4. 4Watch the countdown timer — code refreshes every 30 seconds
5. 5Copy the code and use it to log in
6. 6Save your secret key securely for future use

How TOTP Works

TOTP (Time-based One-Time Password) generates a 6-digit code by combining your secret key with the current time (in 30-second intervals) using HMAC-SHA1. The same algorithm runs on your authenticator app and the server, so they generate the same code at the same time. The code changes every 30 seconds, making it impossible to reuse. This tool implements RFC 6238 — the same standard used by Google Authenticator.

Frequently Asked Questions

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