Password Generator - Create Strong Random Passwords Online

Create strong, secure, and random passwords instantly with this free online password generator . Customise length, character types, and exclusion rules to build passwords that meet any security requirement — all generated locally in your browser for complete privacy. The built-in strength meter shows entropy and estimated crack time as you change the settings.

This random password generator uses the Web Crypto API ( crypto.getRandomValues ) to produce cryptographically secure random values, ensuring your passwords are unpredictable and safe from weak entropy sources like Math.random() . Choose uppercase letters, lowercase letters, numbers, symbols, exclude ambiguous characters, and set any length from 4 to 128 characters.

Why Use a Strong Password Generator?

A strong password generator protects accounts that human-chosen passwords cannot. People reuse passwords, lean on dictionary words, and substitute predictable characters — patterns that automated credential-stuffing and brute-force attacks exploit within minutes. A secure password generator removes that human bias by producing high-entropy strings where every character is drawn from a large, unpredictable pool.

Length matters more than complexity: a 20-character password with four character classes has roughly 131 bits of entropy, which is computationally infeasible to crack with current hardware. This create strong password tool lets you tune the length and character mix to satisfy any site's policy, then copy the result straight into a password manager. Because generation happens entirely client-side, no password ever touches a network.

Live Example

Here is what the generator produces from a typical strong-password configuration. Note how every character class is represented, making the password resistant to brute-force and dictionary attacks:

Length: 20 chars
Uppercase + lowercase + numbers + symbols
Ambiguous chars excluded

K9mR2pL vQ8nXw4 F#&

Key Features

• Cryptographically Secure: Uses the Web Crypto API ( crypto.getRandomValues ) - never Math.random() .
• Adjustable Length: Generate passwords from 4 up to 128 characters.
• Character Rules: Toggle uppercase, lowercase, numbers, basic symbols, and extended symbols independently.
• Ambiguous Character Exclusion: Optionally remove easily confused characters like Il1O0 .
• Strength Meter: Real-time feedback showing Weak, Fair, Good, or Strong.
• One-Click Copy: Copy your generated password to the clipboard instantly.
• 100% Private: All generation happens in your browser - nothing is sent to a server.

How to Use the Password Generator

1. Set your desired password length using the slider (default: 16 characters).
2. Toggle the character types you want to include (uppercase, lowercase, numbers, symbols).
3. Optionally enable "Exclude ambiguous characters" to remove Il1O0 and similar.
4. Click "Generate Password" to create a secure random password.
5. Click "Copy" to copy the password to your clipboard.

About Password Security — Entropy and Strength

Password strength comes down to entropy — a measure of unpredictability counted in bits. Entropy is roughly the password length multiplied by the log-base-2 of the character pool size. A 16-character password using uppercase, lowercase, digits, and symbols (a pool of about 94 characters) offers around 16 × log2(94) ≈ 105 bits of entropy, which is computationally infeasible to brute-force offline. Doubling the length doubles the bits, which is why length matters far more than sprinkling in extra symbols.

This generator draws randomness from the Web Crypto API ( crypto.getRandomValues ), the same cryptographically secure source the browser uses for TLS. It deliberately avoids Math.random() , which is a fast but predictable pseudo-random generator unsuitable for security. Modern guidance, including NIST SP 800-63B , no longer mandates periodic forced changes or arbitrary complexity rules; it recommends long, random, machine-managed secrets stored in a password manager. A random 20-character string is both stronger and easier to manage than a short, twisted, human-memorable one.

For human-typed secrets, a long passphrase (several unrelated words) can rival a short random string in entropy while being easier to remember. For machine-to-machine secrets, prefer a full random string and rotate it if it leaks. If you need a unique, collision-proof identifier rather than a secret, use the UUID Generator ; to protect data at rest, encrypt it with the AES Encryption tool.

Common Errors and How to Fix Them

• "Weak" strength despite symbols: Length drives entropy most. Raise the length to 20+ with all character types on for a "Strong" rating.
• Site rejects special characters: Turn off extended symbols, or use the exclude-ambiguous option. Some login systems only allow a subset of symbols.
• Password too long for the field: Cap the length at what the site accepts (commonly 64 or 128). Never truncate manually — that reduces entropy.
• Can't remember it: That is expected and good. Store every generated password in a trusted password manager rather than reusing one.