# 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.
 
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**Start generating secure TOTP codes now!** This free online tool provides everything you need for robust two-factor authentication setup and testing.