root@generate-random:~/passwords$ _

Random Password Generator

Generate secure random passwords with cryptographic security and NIST 2024 compliance

Our random password generator helps you generate random passwords with cryptographic security and NIST 2024 compliance. Generate-Random.org provides a free password generator that creates strong, unpredictable passwords with customizable length (16+ characters recommended) and complexity options. This random password generator uses cryptographically secure random number generation (CSPRNG) for maximum security—perfect for protecting online accounts, creating API keys, and security testing. Generate passwords instantly with real-time strength analysis. No signup required, completely free. For easier-to-remember alternatives, try our passphrase generator.

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What is a Password Generator?

A password generator is a tool that creates random, complex passwords based on specified parameters. Our generator uses cryptographically secure random number generation to ensure maximum entropy and unpredictability.

Unlike human-created passwords, generated passwords avoid common patterns, dictionary words, and personal information that make accounts vulnerable to brute-force attacks and social engineering. For random text generation, explore our string generator.

Password Generator Configuration Options

Password Length (4-128 Characters)

Password length is the most critical factor for security. Longer passwords exponentially increase the time required to crack them through brute-force attacks. NIST 2024 guidelines recommend minimum 15+ character passwords for strong security, though our generator supports 4-128 characters for flexibility.

Character Set Selection

Choose which character types to include in your password. Using multiple character sets increases the character pool size, resulting in higher entropy and stronger passwords. Options include uppercase, lowercase, numbers, and symbols.

Exclude Similar Characters

Remove ambiguous characters (i, l, 1, L, o, 0, O) to avoid confusion when manually typing passwords. Particularly useful for passwords that need to be read aloud or typed from printed material.

Bulk Generation (1-25 Passwords)

Generate multiple passwords at once for creating credentials for multiple accounts, testing systems, or distributing to team members. Each password is independently generated with full randomness.

How to Generate Secure Passwords

[STEP 1] Configure Length

Set password length between 4-128 characters. We recommend at least 16 characters for maximum security. NIST 2024 guidelines suggest 15+ characters for strong passwords.

[STEP 1] Select Character Types

Enable uppercase, lowercase, numbers, and symbols for stronger passwords. More character types = larger pool = more entropy.

[STEP 1] Generate & Copy

Click generate, then copy your password to clipboard or export to file. Store passwords securely in a password manager.

Password Security Best Practices

_ Use unique passwords for every account - generate multiple with our bulk password generator
_ Store passwords in a secure password manager - never write passwords on paper or in plain text files
_ Enable two-factor authentication when available - adds extra security even if password is compromised
_ Change passwords immediately if a service is breached - use unique passwords to minimize damage
_ Never share passwords via email or messaging apps - for secure sharing, generate webhook secrets instead
_ Use longer passwords over complex short ones - NIST 2024 emphasizes length over complexity

Technical Details: Password Generation Algorithm

Our password generator employs cryptographically secure random number generation algorithms to ensure maximum unpredictability. The system constructs character pools based on selected options, generates random indices with uniform distribution, and assembles passwords with guaranteed entropy levels.

// Mathematical entropy calculation
entropy = password_length × log₂(character_pool_size)

// Character pool sizes:
uppercase: 26 | lowercase: 26 | digits: 10 | symbols: 32

// Example: 16 characters with all character types
16 × log₂(94) ≈ 104.9 bits of entropy

Algorithm: CSPRNG-Based Password Generation
For each password:
  1. Build character pool from selected sets
  2. For each character position:
     - Generate random index using CSPRNG
     - Select character from pool[index]
  3. Validate against constraints
  4. Calculate entropy bits
  5. Return password with strength metrics

Security: NIST SP 800-90A compliant CSPRNG

API Access for Developers

GET https://generate-random.org/api/v1/generate/passwords

VIEW FULL API DOCUMENTATION →

Frequently Asked Questions

What are NIST 2024 Password Length Guidelines? ▶

NIST SP 800-63B (2024) recommends minimum 15+ characters for strong security. Our default 16-character passwords exceed NIST guidelines. For maximum security, use 20-32+ character passwords. Length is more important than complexity according to current cybersecurity research.

Are these passwords cryptographically secure? ▶

Yes, we use cryptographically secure random number generators (CSPRNG) that meet NIST standards for security-critical applications. Each password includes entropy calculations to measure true randomness and strength.

Why doesn't NIST require complexity anymore? ▶

NIST 2024 guidelines eliminated mandatory complexity (uppercase, numbers, symbols) because longer passwords provide better security than complex short ones. Users create more predictable patterns when forced to use complexity. For truly memorable alternatives, try our Diceware passphrase generator.

Should I exclude similar characters? ▶

This option removes ambiguous characters (i, l, 1, L, o, 0, O) to avoid confusion when typing passwords manually. For API tokens and machine-readable secrets, see our API key generator.