CentralTools
100% Client-Side

Strong Password & API Key Generator with Entropy Score (NIST Compliant)

Generate cryptographically secure passwords, passphrases, and API secret keys. Check real-time NIST entropy strength and crack time estimation.

Generated Secure Output

Security Settings

18 Chars
🛡️ NIST Mathematical Entropy

0 Bits

Rating: None

⏳ Estimated Brute-Force Crack Time:

Instant

Calculated against an attacker equipped with high-performance supercomputer clusters guessing 100 Billion hashes per second.

100% Cryptographic CSPRNG: Generated locally inside your browser using the native Web Cryptography API (window.crypto).

Free Strong Password & API Secret Key Generator

Generate cryptographically secure passwords, Diceware passphrases, and developer API secret tokens using browser Web Crypto APIs. Features real-time NIST entropy calculation, brute-force crack time estimates, and custom symbol filters.

Quick How-To Guide

  1. 1Choose your mode: "Random Password", "Passphrase", or "API Secret"
  2. 2Set your desired character length slider (16+ recommended for high security)
  3. 3Toggle character sets (Symbols, Numbers, Uppercase, Lowercase)
  4. 4Click "Copy Password" to safely use in your password manager or application

Why use our tool?

Cryptographically secure random number generation (CSPRNG via window.crypto)
Multiple modes: Random Password, Memorable Passphrase (Diceware), and Developer API Secret Key
Customizable length (8 to 128 characters) with uppercase, lowercase, numbers, and symbols toggles
Real-time Entropy bit score and estimated brute-force crack time indicator
Exclude ambiguous characters (0, O, l, 1, I) option for easy manual typing
100% client-side: generated passwords never touch any server or network connection

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

Our generator uses the browser’s native window.crypto.getRandomValues() CSPRNG (Cryptographically Secure Pseudo-Random Number Generator), ensuring true cryptographic randomness.
An entropy of 60+ bits provides strong security against offline attacks. An entropy of 80–128+ bits is virtually uncrackable with modern supercomputers.
Passphrases combine 4–6 random dictionary words, offering extremely high mathematical entropy while remaining easy for humans to remember without writing them down.

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