2FA Authenticator

What is Two-Factor Authentication?

Two-factor authentication (2FA) is a security mechanism requiring users to provide two different authentication factors to access an account. In addition to your password, you need a second factor—typically a one-time code that changes every 30 seconds (TOTP). Even if your password is compromised, attackers cannot access your account without the second factor.

How Does TOTP Work?

TOTP (Time-based One-Time Password) is based on RFC 6238 standard. It uses a shared secret and current timestamp through HMAC-SHA1 algorithm to generate a 6-digit code. The code refreshes every 30 seconds, ensuring each login uses a different code and effectively preventing replay attacks.

Online Authenticator vs Google Authenticator

Both serve the same function and generate standard-compliant TOTP codes. Key differences include:

• No Installation:Online authenticator works directly in browser, no app download required
• Cross-platform:Data stored locally in browser; keys need re-import when changing devices
• Same Security:Both compute codes locally, keys never uploaded to servers
• Open Source:Our code is fully open source for security audit

Which Services Are Supported?

Our authenticator is compatible with all services supporting TOTP standard, including:

• Google (Gmail, YouTube)
• Microsoft (Outlook, OneDrive)
• GitHub / GitLab
• Facebook / Instagram
• Twitter / X
• Amazon AWS
• Dropbox
• Stripe
• Cryptocurrency Exchanges
• Password Managers (Bitwarden, 1Password)

How to Get Your 2FA Secret Key?

When enabling 2FA on any service, look for "Set up manually" or "Enter text instead" option. You'll see a Base32 secret key like JBSWY3DPEHPK3PXP—copy it to the input field above. Some services also display a QR code for scanning with mobile apps.

What If I Lose My 2FA Key?

This is the most common issue after enabling 2FA. We recommend these precautions:

• Save Backup Codes:Most services provide one-time recovery codes—keep them safe
• Backup Your Key:Store 2FA secrets in a secure location (like password manager)
• Use Multiple Devices:Set up authenticator on both phone and computer

If you've lost your key without backup, contact the service provider's support for identity verification and 2FA reset.

Why Are Authenticator Apps Safer Than SMS?

SMS verification codes have multiple security risks:

• SIM Swapping:Attackers can transfer your phone number to their SIM card
• SMS Interception:Malware or network attacks can intercept messages
• Requires Network:Cannot receive codes without signal

Authenticator codes are computed locally, don't require network, and cannot be remotely intercepted—far more secure than SMS verification.

Privacy & Security Guarantee

Our 2FA Authenticator runs entirely in your browser:

• Uses Web Crypto API for secure cryptographic computation
• Keys stored only in browser localStorage, never leave your device
• No data is ever sent to any server
• Dark mode support for eye protection

For maximum account protection, we recommend using our Password Generator to create strong passwords alongside 2FA.