Password Generator Pro
Generate strong, secure passwords with customizable options
Generated Password
How to generate secure passwords online?
Generate secure passwords with our customizable password generator. Create strong, unique passwords with various character sets, length options, and complexity requirements. Perfect for account security, system administration, and password management.
Features
- Cryptographically secure randomness via the Web Crypto API (window.crypto.getRandomValues), not Math.random()
- Four generation modes: random, memorable word-based, pronounceable consonant-vowel, and pattern-based with rotating character classes
- Adjustable length up to 100+ characters with toggles for uppercase, lowercase, numbers, and symbols (!@#$%^&*()_+-=[]{}|;:,.<>?)
- Exclude visually similar (i, l, 1, O, 0) and ambiguous shell-unsafe characters ({}, [], (), /, \, |) for safer paste-and-type usage
- Live entropy meter (bits) with estimated brute-force time at 10^12 attempts/second, plus weighted strength score from 0 to 12
- Built-in PIN generator (numeric) and passphrase generator (Diceware-style word lists with custom separator)
- Five preset templates tuned per use case: General, Banking (length 20, exclude similar), Email, Social Media, Work Account
- Bulk generation of multiple passwords in one click and local-only history saved in localStorage, never sent over the network
- Constraint engine that prevents repeated characters, sequential runs (abc, 123), and matches against a common-words blocklist (password, qwerty, admin, etc.)
How to use
- Pick a generation type: Password (random characters), PIN (digits only), or Passphrase (word-based).
- Choose a preset template (Banking, Email, Work) or select a generation mode (Random, Memorable, Pronounceable, Pattern).
- Set the length — 16 characters is the OWASP/NIST recommended minimum for high-value accounts; the Banking preset defaults to 20.
- Toggle character classes and, under Advanced, enable exclude-similar/ambiguous and the avoid-repeating/sequential filters.
- Click Generate. Review the entropy reading (aim for 75+ bits) and the time-to-crack estimate before accepting the result.
- Copy to clipboard, then paste straight into your password manager. The local history makes regeneration easy if needed.
Tips & Best Practices
- All processing happens locally in your browser — your data never leaves your device.
- Never share sensitive tokens or passwords in unencrypted channels.
- Regularly rotate your secrets, keys, and passwords for better security.
- Use strong, unique values for each service or application.
- Verify the output before using it in production environments.
FAQ
Why use a generated password instead of one I make up myself?
Human-chosen passwords (even with substitutions like P@ssw0rd!) follow predictable patterns that attackers test first via dictionary and rule-based attacks, so they offer far less effective entropy than their length suggests. A 16-character random password from this tool yields roughly 95+ bits of entropy, strong enough that a well-funded attacker would need centuries to brute-force it even at 10^12 guesses per second.
Is the randomness actually secure, or just Math.random()?
All character selection uses window.crypto.getRandomValues() from the Web Crypto API, which is a CSPRNG (cryptographically secure pseudo-random number generator) seeded from the operating system's entropy pool. Math.random() is only used as a non-security fallback during server-side rendering when no real password is generated. You can verify this by viewing source: there is no remote API call involved.
Does anything I generate ever leave my browser?
No. Every password is generated locally in JavaScript and never transmitted. The optional history is stored only in your browser's localStorage on this device and is not synced anywhere. If you clear browser data or use private/incognito mode, the history disappears with it.
How long should my password actually be?
NIST SP 800-63B recommends a minimum of 8 characters but encourages much longer for sensitive accounts; OWASP suggests 12+ for general use and 16+ for privileged or admin accounts. With this tool's defaults (mixed character classes), 16 characters reaches roughly 95 bits of entropy, the practical sweet spot. Use 20+ for banking, root, and password-vault master passwords.
When should I use a passphrase instead of a random password?
Passphrases (e.g., 'mountain-river-eagle-jewel') are preferable when you must type or remember the password yourself, like a password-manager master password or full-disk encryption key. Four random words from a 7,000+ word list give about 50+ bits of entropy and are far easier to type accurately. For everything else stored in a password manager, a 16-character random password is shorter and stronger.
What does 'time to crack' actually assume?
The estimate uses 10^12 guesses per second, which approximates a well-resourced offline attack against a fast hash (e.g., unsalted MD5/SHA-1) on a high-end GPU cluster. Modern password hashing schemes like bcrypt, scrypt, and Argon2 are deliberately 10,000x to 1,000,000x slower, so a leaked hash protected by them is far harder to crack than the raw figure suggests. Treat the displayed time as a worst-case lower bound.
Should I exclude similar or ambiguous characters?
Enable 'exclude similar' (i, l, 1, O, 0) when the password might be read off a screen and typed manually, such as printed handover sheets, kiosk logins, or recovery codes. Enable 'exclude ambiguous' (quotes, backticks, backslashes) when the password is pasted into a shell, JSON config, or YAML file where those characters need escaping. Both options shrink the alphabet slightly, so add a couple of characters to keep equivalent entropy.
Why doesn't this tool check if my password has been breached?
A freshly generated random password has, by definition, never been used before and cannot appear in any breach corpus like haveibeenpwned. Breach-checking is only meaningful for existing passwords you already use. To audit those, use a dedicated service that supports k-anonymity (HIBP's range API) so the password itself is never sent. Never paste an existing real password into any web form, including this one.