Free Password Generator
Generate strong, random passwords instantly.
A password generator is a free online tool that creates strong, random passwords instantly using cryptographic randomness. Choose your desired length and character types — uppercase letters, lowercase letters, numbers, and symbols — then copy your new password with one click.
How it works
The generator uses the browser's Web Crypto API (window.crypto.getRandomValues) to produce truly random passwords — not the predictable pseudo-random output from Math.random(). Each character is independently selected from your chosen character set, ensuring maximum entropy and unpredictability. The Fisher-Yates shuffle algorithm then randomizes the order of all characters, guaranteeing that the required character types are distributed throughout the password rather than clustered at the beginning. The password strength indicator estimates entropy in bits based on length and character set size, giving you instant feedback. A 12-character password with all four character types provides roughly 72 bits of entropy, while a 20-character password reaches 120 bits — well beyond what any current computer could brute force within a human lifetime.
The generator offers three modes. Random mode creates a traditional password with mixed character types. PIN mode generates numeric codes between 4 and 8 digits, useful for phone locks, ATM codes, or temporary access codes. Passphrase mode strings together random words from a curated dictionary, creating long but memorable phrases like "eagle-zebra-piano-river" that are easy to type and hard to crack. The exclude-similar option removes visually ambiguous characters like lowercase L, uppercase I, the digit 1, and the letter O versus zero, which is especially helpful when you need to read your password over the phone or type it on a mobile keyboard.
When to use a password generator
Use a free password generator whenever you create a new account, update an existing password, or need a secure token. Every account should have a unique, randomly generated password — reusing passwords across sites is the leading cause of account compromise in data breaches. When one service gets hacked and your password is exposed, attackers immediately try that same email and password combination on banking, email, and social media sites. A unique password for every account prevents this domino effect entirely.
Pair generated passwords with a reputable password manager to store them securely. This gives you the convenience of auto-fill with the security of unguessable passwords on every account — the single best security upgrade most people can make. The built-in history panel (stored in your browser's session storage) keeps your last 10 generated passwords accessible during your current browsing session, making it easy to register multiple accounts without losing track of each new password. For bulk account creation, the multi-generate feature produces 3, 5, or 10 passwords at once with individual copy buttons for each.
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Frequently asked questions
How long should a strong password be in 2025?
Security experts recommend a minimum of 16 characters for important accounts in 2025. NIST guidelines suggest 15+ characters. Length matters more than complexity — a 20-character password of random words is stronger than a 10-character mix of symbols. For critical accounts like banking and email, use 20+ characters. The generator above defaults to 16 characters.
What makes a password truly secure?
A secure password is long (16+ characters), random (not based on words, names, or patterns), unique (never reused across sites), and not in any known data breach. True randomness is critical — humans are terrible at creating random passwords because we unconsciously repeat patterns. Use a generator with cryptographic randomness, not keyboard walks like 'qwerty123'.
Should I use a password manager?
Yes — security experts universally recommend password managers. They generate strong unique passwords for every site, store them encrypted, and auto-fill them so you only need to remember one master password. Top options include Bitwarden (free, open source), 1Password, and Dashlane. The risk of reusing passwords across sites far outweighs any risk from a reputable password manager.
Is it safe to generate passwords in a browser?
This generator uses window.crypto.getRandomValues() — the same cryptographic random number generator used by your browser for HTTPS encryption. The password is generated entirely on your device and never transmitted to any server. You can verify this by disconnecting from the internet and generating passwords — they work identically offline.
How often should I change my passwords?
NIST (National Institute of Standards and Technology) updated its guidance in 2020: don't change passwords on a fixed schedule unless you have reason to believe they were compromised. Frequent forced changes lead users to make weaker, predictable modifications ('Password1' → 'Password2'). Change passwords immediately after a data breach notification or suspected compromise.
What is the difference between a passphrase and a password?
A passphrase is a sequence of random words (e.g., 'correct-horse-battery-staple') rather than a string of characters. Passphrases are easier to remember and type while being highly secure when words are truly random. A 4-word passphrase from a 7,000-word list has more entropy than most 10-character symbol-heavy passwords. Both approaches are valid — passphrases win on memorability.