Password Tool

CRYPTO PASSWORD GENERATOR

Generate cryptographically secure passwords. Batch generate, exclude ambiguous chars, view crack-time estimates, and keep a history of your last passwords.

Private by design No signup · Free

Settings

Configure password generation rules.

Length

Passwords to Generate

Character Types

Uppercase (A-Z) Lowercase (a-z) Numbers (0-9) Symbols (!@#$%^&*)

Exclude Ambiguous0O1lI!|

Generated Passwords

Configure settings and click Generate.

History

Your last 10 generated passwords (stored locally).

No passwords generated yet.

Password Tips

•Length matters most: Each extra character makes your password exponentially harder to crack. Aim for 16+ characters.
•Mix character types: Use uppercase, lowercase, numbers, and symbols to maximize the search space for attackers.
•Use a password manager: Strong passwords are hard to remember. Let a manager store them so you can use unique passwords everywhere.

Frequently Asked Questions

What makes a strong password?

A strong password is long (16+ characters), uses a mix of uppercase letters, lowercase letters, numbers, and symbols, and is completely random with no dictionary words or personal information. Entropy of 60+ bits is considered very strong.

Is this password generator secure?

Yes, this generator uses the Web Crypto API (crypto.getRandomValues) which is cryptographically secure and built into modern browsers. It is the same RNG used for encryption keys and is far more secure than Math.random().

What is password entropy?

Entropy measures password strength in bits. It depends on the character set size and length. Higher entropy means more guesses required to crack the password. 28 bits is weak, 36-59 is strong, and 60+ is very strong against offline attacks.

How long should my password be?

For most accounts, 12-16 characters is recommended. For high-security uses like crypto wallets or email, aim for 20+ characters. A 16-character password with all character types has about 95 bits of entropy.

Should I reuse passwords?

Never reuse passwords across different sites. If one site is breached, attackers will try the same email and password on other services. Use a password manager to generate and store unique passwords for every account.

Can I generate passwords offline?

Yes. Once loaded, the generator runs fully offline using Web Crypto entropy in your browser. Disconnect Wi-Fi, generate 20+ character passwords with 80+ bits entropy, then store them in a password manager or encrypted wallet backup.

How should I store seed phrases and wallet backups?

Write BIP39 seed words on paper or metal, add an optional passphrase, store copies in separate secure locations, and never photograph or cloud-sync them. Use the entropy checker to confirm 128+ bits before funding the wallet.

How is entropy calculated?

Entropy equals log2(charset size) times length — e.g. 94 symbols at 20 characters gives about 131 bits. The meter flags under 36 bits as weak and over 60 bits as very strong against offline cracking at 10 billion guesses per second.

Is generation private?

Yes. All random bytes come from crypto.getRandomValues locally. Nothing uploads, no wallet addresses or passwords leave your browser, and history stays in local memory only.

How to Use

Set password length

Choose a longer password (16+ characters) for stronger security.

Select character types

Enable uppercase, lowercase, numbers, and symbols for maximum strength.

Batch generate

Choose how many passwords to generate at once (up to 20).

Copy and save

Copy individual passwords or export your full history as text.

Check entropy strength

Read bits and crack-time estimate to confirm 60+ bits for wallets.

Backup offline securely

Store passwords and seed phrases in a manager or offline paper/metal backup.

How to Calculate

The generator uses the browser's built-in crypto.getRandomValues() for true randomness. Each character is picked uniformly from the selected character set. Entropy is calculated as log2(charset_size) × password_length. The strength scale: 0-27 bits = Weak, 28-35 = Medium, 36-59 = Strong, 60+ = Very Strong. Crack time is estimated at 1e10 guesses/sec (fast hash).

About the Crypto Password Generator

The Crypto Password Generator creates cryptographically secure passwords, wallet passphrases and API keys using Web Crypto entropy with charset and length controls, strength meter in bits, batch generation and offline support.

Built for wallet backup hygiene — verify entropy (60+ bits strong, 128+ for seeds), store seed phrases offline on paper or metal with optional BIP39 passphrase, and never reuse credentials. All processing happens directly in your browser with no sign-up, no storage and no tracking.

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Methodology & feedback

Figures run locally in your browser from the values you enter (page updated 2026-10-02). Estimates are educational only — verify finance, tax and health decisions with a qualified professional (see Disclaimer). Spotted an error? Report it via contact and we correct with a new update date.

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