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OTP代码生成器
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密钥（十六进制）
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Free TOTP Generator & 2FA Code Generator Online

Overview

Free TOTP Generator & 2FA Code Generator is a professional, secure, and user-friendly online tool designed for generating Time-based One-Time Passwords (TOTP) and two-factor authentication codes. This free online tool is fully compatible with popular authenticator apps like Google Authenticator, Authy, Microsoft Authenticator, and other RFC 6238 compliant applications.

Key Features

  • 🔐 Secure TOTP Generation: Generate RFC 6238 compliant time-based one-time passwords
  • 📱 QR Code Support: Instantly generate QR codes for easy mobile app setup
  • ⏱️ Real-time Updates: Automatic 30-second refresh with visual countdown
  • 🔄 Multiple Token View: Display previous, current, and next tokens simultaneously
  • 🛡️ Client-side Security: All calculations performed locally - no data transmitted
  • 📋 One-click Copy: Easy copying of tokens, secrets, and technical details
  • 🌐 Universal Compatibility: Works with all major authenticator applications

Use Cases

For Developers

  • Test two-factor authentication implementations
  • Debug TOTP-based authentication systems
  • Validate RFC 6238 compliance
  • Generate test tokens for development environments

For System Administrators

  • Set up 2FA for enterprise applications
  • Validate authenticator app configurations
  • Troubleshoot authentication issues
  • Generate backup codes for critical systems

For Security Professionals

  • Audit two-factor authentication setups
  • Test TOTP implementation security
  • Validate time synchronization requirements
  • Demonstrate 2FA concepts and workflows

How to Use

Step 1: Enter Secret Key

Input your base32-encoded secret key in the designated field. The tool accepts standard TOTP secret formats used by authenticator apps.

Step 2: Generate TOTP Codes

The tool automatically generates:
  • Previous Token: The code that was valid 30 seconds ago
  • Current Token: The currently valid 6-digit code
  • Next Token: The code that will be valid in the next 30-second window

Step 3: View Technical Details

Monitor additional information including:
  • Hex Secret: Hexadecimal representation of your secret
  • Epoch Time: Current Unix timestamp
  • Counter: Time-based counter value
  • Hex Counter: Hexadecimal counter representation

Step 4: Generate QR Code

The tool automatically generates a QR code that can be scanned by any compatible authenticator app for easy setup.

Step 5: Copy and Use

Use the one-click copy buttons to quickly copy any generated value for use in your applications or authenticator apps.

Technical Specifications

  • Algorithm: HMAC-SHA1 (RFC 6238 standard)
  • Token Length: 6 digits
  • Time Window: 30 seconds
  • Encoding: Base32 for secrets
  • Compatibility: Google Authenticator, Authy, Microsoft Authenticator, 1Password, Bitwarden
  • Standards Compliance: RFC 6238 (TOTP), RFC 4226 (HOTP)

Security Features

Client-side Processing

All TOTP calculations are performed entirely in your browser. No secret keys or generated tokens are transmitted to any server, ensuring maximum security and privacy.

No Data Storage

The tool does not store, log, or transmit any sensitive information. All data remains local to your browser session.

Open Source Transparency

Built with open-source technologies, allowing for security audits and verification of the implementation.

Compatibility

This TOTP generator is fully compatible with:
  • Google Authenticator (iOS/Android)
  • Authy (iOS/Android/Desktop)
  • Microsoft Authenticator (iOS/Android)
  • 1Password (with TOTP support)
  • Bitwarden (Premium/Organization)
  • LastPass Authenticator
  • Any RFC 6238 compliant authenticator

Frequently Asked Questions

Is this tool secure?

Yes, all calculations are performed client-side in your browser. No data is transmitted to external servers.

Can I use this with Google Authenticator?

Absolutely! This tool generates standard TOTP codes that work with Google Authenticator and all other major authenticator apps.

What if my tokens don't match?

Ensure your system clock is synchronized. TOTP relies on accurate time synchronization between the generator and validator.

Can I use this for production systems?

While the tool is secure and accurate, always follow your organization's security policies regarding authentication tools.

Is this tool free?

Yes, this TOTP generator is completely free to use with no limitations or registration required.
Start generating secure TOTP codes now! This free online tool provides everything you need for robust two-factor authentication setup and testing.