Strong Password Generator

Create ultra-high entropy 24+ character cryptographic passwords or multi-word passphrases engineered to resist GPU and ASIC brute-force attacks.

Category: Generators

How to Use Strong Password Generator

  1. Select 'High-Entropy Random Characters' for password managers or 'Memorable Multi-Word Passphrase' for master vault passwords.
  2. Set a target length (24 characters is the default for cryptographic-grade 150+ bit entropy).
  3. Configure character classes or ambiguous-character exclusions as needed.
  4. Click Execute Strong Password Generator to produce your password and review its entropy bits and offline crack resistance.

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Frequently Asked Questions

Why default to 24 characters for a strong password?

A 24-character password drawn from all four ASCII character classes (88 characters) provides roughly 155 bits of entropy—exceeding the 128-bit security threshold of AES-128 encryption and rendering offline GPU cluster brute-force attacks mathematically infeasible.

When should I choose Passphrase Mode over Random Character Mode?

Use Random Character Mode when saving credentials inside a password manager (like Bitwarden or 1Password) where you copy and paste. Choose Passphrase Mode when creating a master password, disk-encryption key (FileVault/BitLocker), or Wi-Fi password that you must memorize and type by hand.

How is offline crack time estimated?

The crack-time estimator models an attacker capable of testing 100 billion (10¹¹) hashes per second—typical of a multi-GPU cracking rig attacking fast unsalted hashes—and divides the total keyspace (2^entropyBits) to show worst-case brute-force duration.

Can I generate multiple strong passwords at once for team provisioning?

Yes. Set the Batch Quantity option up to 50 to generate a newline-separated list of independent cryptographic passwords or passphrases that you can copy or download as a .txt file.

Is any part of my generated master password sent over the internet?

Never. All random byte generation and string formatting happen exclusively inside your browser's local execution context via window.crypto.getRandomValues.