Random Number Generator

Generate cryptographically secure random numbers, dice rolls, and boolean values. Perfect for passwords, games, statistical sampling, and any application requiring true randomness.

Random Number Generator

Quick Presets:

What Makes Random Numbers "Random"?

True vs Pseudo-Random

  • • True Random: Based on physical phenomena (atmospheric noise, radioactive decay)
  • • Pseudo-Random: Generated by mathematical algorithms with seed values
  • • Cryptographically Secure: Unpredictable even with knowledge of previous outputs
  • • Statistical Properties: Pass rigorous randomness tests
  • • Entropy Sources: Hardware random number generators, user input timing

Our Implementation

  • • Web Crypto API: Uses browser's cryptographic random source
  • • High Entropy: Backed by operating system's random number generator
  • • No Predictability: Cannot be reproduced or predicted
  • • Statistical Quality: Passes randomness and uniformity tests
  • • Security Grade: Suitable for cryptographic applications

Common Use Cases

🎲 Gaming & Entertainment

  • • Dice rolls for tabletop games
  • • Lottery number selection
  • • Random team assignments
  • • Prize drawings and giveaways
  • • Game character stats generation
  • • Random event triggers

🔒 Security & Cryptography

  • • Password and PIN generation
  • • Cryptographic key creation
  • • Session token generation
  • • Salt values for hashing
  • • Nonce values for encryption
  • • Random challenge codes

📊 Research & Testing

  • • Statistical sampling
  • • A/B test group assignment
  • • Monte Carlo simulations
  • • Survey randomization
  • • Scientific experiment design
  • • Quality assurance testing

Number Types & Applications

🔢 Integer Generation

Example Uses:
  • • ID numbers: 1000-9999
  • • Age simulation: 18-65
  • • Inventory quantities: 1-500
  • • Score generation: 0-100
Features:
  • • Custom range (min-max)
  • • Unique numbers option
  • • Bulk generation (up to 10,000)
  • • Statistical analysis

📐 Decimal Generation

Example Uses:
  • • Coordinates: -180.0 to 180.0
  • • Percentages: 0.0% to 100.0%
  • • Measurements: 0.00 to 999.99
  • • Scientific data: any precision
Features:
  • • Custom decimal places (0-10)
  • • Flexible range support
  • • Scientific notation compatible
  • • Mean and standard deviation

🎯 Boolean Generation

Example Uses:
  • • Coin flips: True/False
  • • Feature flags: On/Off
  • • Binary decisions: Yes/No
  • • Random conditions: Active/Inactive
Applications:
  • • A/B testing assignment
  • • Random sampling
  • • Game mechanics
  • • Statistical experiments

🎲 Dice Rolling

Dice Types:
  • • d4 (1-4): Tetrahedral die
  • • d6 (1-6): Standard cube die
  • • d8 (1-8): Octahedral die
  • • d10, d12, d20, d100: Polyhedral dice
Gaming Applications:
  • • D&D and RPG campaigns
  • • Board game mechanics
  • • Probability demonstrations
  • • Educational statistics

Statistical Analysis Features

📈 Descriptive Statistics

  • • Sum: Total of all generated numbers
  • • Average (Mean): Sum divided by count
  • • Median: Middle value when sorted
  • • Mode: Most frequently occurring value
  • • Range: Difference between max and min
  • • Distribution: Spread of values across range

🔍 Quality Indicators

  • • Uniformity: Even distribution across range
  • • Independence: Each number unrelated to others
  • • Unpredictability: Cannot forecast next value
  • • Repeatability: Different results each generation
  • • Statistical Tests: Chi-square, Kolmogorov-Smirnov
  • • Entropy Measure: Randomness quantification
Understanding Statistical Significance

With truly random numbers, you might observe patterns or clusters in small samples. This is normal! True randomness doesn't mean "evenly spaced" - it means unpredictable. Statistical properties become apparent with larger sample sizes (1000+ numbers).

Advanced Features

🛠️ Configuration Options

  • • Custom Ranges: Define your own min/max values
  • • Bulk Generation: Create up to 10,000 numbers at once
  • • No Duplicates: Ensure all numbers are unique
  • • Sorting Options: Ascending, descending, or random order
  • • Export Formats: Copy to clipboard or download as text
  • • History Tracking: View recent generations

⚡ Quick Presets

Lottery Numbers:
6 unique numbers from 1-49
Coin Flips:
10 True/False values
Dice Rolls:
2d6 rolled 5 times
Percentages:
5 values from 0.0-100.0%

Security & Cryptographic Applications

🔐 Cryptographic Standards

  • • FIPS 140-2: Federal cryptographic standards compliance
  • • NIST SP 800-90A: Approved random number generation methods
  • • Common Criteria: International security certification standards
  • • Entropy Requirements: Sufficient randomness for key generation
  • • Statistical Testing: Passes NIST randomness test suite

🛡️ Security Use Cases

  • • Key Generation: AES, RSA, and other cryptographic keys
  • • Salt Values: Password hashing with bcrypt, scrypt
  • • Session Tokens: Web application security
  • • Initialization Vectors: Encryption algorithm parameters
  • • Nonces: Number used once in protocols
  • • Challenge Values: Authentication systems
⚠️ Security Considerations
  • • Never use predictable pseudo-random generators for cryptographic purposes
  • • Ensure sufficient entropy when generating keys or sensitive values
  • • Our generator uses Web Crypto API, suitable for most security applications
  • • For high-stakes cryptography, consider hardware security modules (HSMs)
  • • Regularly test and validate randomness quality for critical applications

Privacy & Performance

🔒 Privacy Protection

  • • Client-Side Only: All generation happens in your browser
  • • No Data Transmission: Numbers never sent to our servers
  • • No Logging: No history stored on our end
  • • Local Processing: Works offline once loaded
  • • Memory Safe: Data cleared when page closes
  • • Secure Context: Uses HTTPS for Web Crypto API access

⚡ Performance Characteristics

  • • Generation Speed: ~100,000 numbers per second
  • • Memory Usage: Efficient for large batches
  • • Browser Support: All modern browsers with Web Crypto
  • • Batch Processing: Optimized for bulk operations
  • • Real-time Statistics: Calculated as numbers generate
  • • Export Options: Quick download for large datasets