What makes a password strong?

Length and unpredictability matter most. A long password drawn from a large character set is far harder to crack than a short one with clever substitutions. Avoid dictionary words, names, and keyboard patterns.

What is zxcvbn and why use it?

zxcvbn is a password strength estimator that models real attacker behaviour. Instead of just counting character types, it recognises common words, patterns, and sequences and estimates how long a password would actually take to crack.

Are the generated passwords truly random?

They are drawn from the browser's cryptographically secure random source rather than a predictable pseudo-random function, which is suitable for generating credentials.

Should I include symbols and numbers?

Including more character types increases the space an attacker must search, which helps. But adding a few characters of length usually increases strength even more, so prefer longer passwords where a site allows it.

Is my password sent anywhere when I test it?

No. Both generation and strength analysis run entirely in your browser, so nothing you type or generate is uploaded or stored.

Password Generator and Validator

Generate and validate cryptographically secure passwords and test password strength using zxcvbn. Includes customizable options for uppercase, numbers, and symbols with real-time strength analysis.

Generated Password

Password Options

Password Length16 characters

664

Include Characters

Lowercase (a-z)

Always included

Required

Uppercase (A-Z)

ABCDEFGHIJKLMNOPQRSTUVWXYZ

Numbers (0-9)

0123456789

Symbols

!@#$%^&*()_+-=[]{}|;:,.<>?

Symbols to include

Only these symbols are used. Duplicates and spaces are ignored.

About Password Security

This tool generates cryptographically secure passwords using your browser built-in crypto API. All password generation and strength testing happens locally in your browser - nothing is sent to any server.

Password Strength Scoring:

Very Weak (0): Easily guessable, avoid using
Weak (1): Vulnerable to attacks, not recommended
Fair (2): Better but still could be improved
Strong (3): Good password, reasonably secure
Very Strong (4): Excellent password, highly secure

Best Practices:

Use at least 12-16 characters for important accounts
Include a mix of uppercase, lowercase, numbers, and symbols
Never reuse passwords across different accounts
Consider using a password manager to store passwords securely
Enable two-factor authentication (2FA) when available

About Password Generator and Validator

A strong password isn't about being hard to type — it's about being hard to guess, even for a machine that can try billions of combinations. Length and unpredictability matter far more than swapping an 'a' for an '@'. This tool generates passwords from a cryptographically secure random source and lets you tune exactly which character sets are included so the result fits the rules of whatever account you're securing.

It also works the other way around: paste any password and the validator scores its strength using zxcvbn, the same realistic estimator that recognises common patterns, dictionary words, keyboard walks, and repeated characters. Instead of a naive "has a number, has a symbol" check, you get an honest estimate of how long the password would resist a real attack, plus feedback on what makes it weak.

Generation and analysis happen entirely in your browser. No password you create or test is transmitted or stored, so you can safely use the tool to build credentials and immediately move them into your password manager.

How to use Password Generator and Validator

Set the length and character sets
Choose the password length and toggle uppercase letters, numbers, and symbols to match the target site's requirements.
Generate a password
The tool draws characters from a cryptographically secure random generator to produce an unpredictable password.
Check the strength
Read the zxcvbn strength score and feedback to confirm the password resists common attack patterns.
Copy it to your manager
Copy the password and store it in your password manager — avoid reusing it across accounts.

Frequently asked questions

Hash Generator & Verifier

Generate MD5, SHA-1, SHA-256, SHA-512, and bcrypt hashes. Verify strings against known hashes.

UUID Generator & Validator

Generate v1 or v4 UUIDs, validate existing ones, detect versions, and inspect v1 timestamps.

Base64 Encoder / Decoder

Encode text or files to Base64, or decode Base64 back to its original form. Supports text input and file drag-and-drop.