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OTP Generator (TOTP)

Generate Time-based One-Time Passwords (TOTP) using shared secret keys for two-factor authentication and security auditing.

🚀 Why Use OTP Generator?

The OTP Generator is an essential tool for cybersecurity professionals, developers, and anyone working with two-factor authentication systems. It provides real-time TOTP generation for testing, debugging, and security analysis of authentication systems.

Security First

  • Client-Side Processing: All OTP generation occurs locally in your browser using industry-standard cryptographic libraries
  • No Data Logging: Secret keys and generated codes never leave your device
  • Open Standards: Implements RFC 6238 TOTP specification using the otplib library
  • Time Synchronization: Automatically synchronizes with your device's time for accurate code generation

🛠️ Key Features

  • Real-Time Generation: Generates TOTP codes with live countdown timer showing remaining validity period
  • Configurable Parameters: Customizable digits (6-8), time periods (1+ seconds), and hashing algorithms (SHA1/256/512)
  • Base32 Secret Validation: Validates and formats Base32 encoded secret keys with real-time error feedback
  • Visual Progress Bar: Shows remaining time until code expiration with visual countdown
  • Copy Functionality: One-click copy for generated OTP codes
  • Auto-Refresh: Automatically generates new codes when the time period expires

📖 How to Use

  1. Access the Tool: Navigate to the OTP Generator page
  2. Enter Secret Key: Input your Base32 encoded secret key in the "Secret Key" field (e.g., JBSWY3DPEHPK3PXP)
  3. Configure Settings: Adjust the number of digits (6 or 8), time period (usually 30 seconds), and hashing algorithm
  4. Generate OTP: The tool automatically generates TOTP codes based on current time and your secret
  5. Monitor Expiration: Watch the countdown timer and progress bar to see when the current code expires
  6. Copy Results: Click "Copy OTP" to save the generated code to your clipboard

🔧 Technical Specifications

Supported Parameters

  • Digits: 6 or 8 digit codes
  • Time Period: 1-300+ seconds (commonly 30 seconds)
  • Algorithms: SHA1, SHA256, SHA512
  • Secret Format: Base32 encoded strings

Validation Features

  • Base32 Validation: Ensures secret keys contain only valid Base32 characters (A-Z, 2-7, = for padding)
  • Time Remaining Calculation: Uses totp.timeRemaining() to show seconds left for current code
  • Auto-Correction: Automatically formats secret keys by removing spaces and converting to uppercase
  • Real-Time Error Handling: Provides immediate feedback for invalid secret keys or generation errors

🔗 Access the Tool

You can find the tool at the following link: https://tools.lavx.hu/tools/otp-generator

🌟 About Tools Suite

Tools Suite is a comprehensive collection of over 100+ free online utilities for developers, designers, and security researchers. Our mission is to provide high-quality, privacy-respecting tools that make your digital life easier.

Related Topics: security, generator, otp, totp, authentication, 2fa, mfa, cryptography, rfc6238

Explore more tools at tools.lavx.hu.