What is a Password Generator?
A random password generator creates unpredictable passwords using a cryptographically secure random number generator. Unlike invented passwords, which follow guessable patterns, generated passwords have high entropy — a random 16-character password with mixed character types has roughly 100 bits of entropy and would take trillions of years to brute-force.
Why humans are terrible at randomness
Ask a person to invent a "random" password and you get the opposite: a dictionary word, a capital letter at the front, digits at the end, and maybe a predictable substitution like @ for a. Attackers know this. Passwords such as P@ssw0rd, Summer2025! and qwerty123 appear in every cracking dictionary, and rule-based attacks try billions of human-flavored variations per hour.
The problem is psychological, not intellectual. We choose passwords we can remember, and memorable things are patterned things. A machine has no such bias — it picks every character with equal probability from the whole pool, which is exactly what makes generated passwords so hard to crack.
How this generator works
Every password is created locally in your browser with crypto.getRandomValues(), the Web Crypto API that security software, password managers and operating systems rely on. It is a cryptographically secure pseudorandom number generator — categorically different from Math.random(), which is fast but predictable and must never be used for secrets.
Nothing you generate is sent over the network, logged, or stored. You can open your browser's developer tools, watch the network tab, and confirm that zero requests carry your password. When you close the tab, the password is gone unless you copied it.
Entropy: why length beats complexity
Entropy measures a password's unpredictability in bits, and each added bit doubles the number of guesses an attacker needs. A character drawn from a 94-symbol pool contributes about 6.6 bits, so going from 12 to 16 characters adds roughly 26 bits — multiplying the attack cost by tens of millions. This generator shows the exact entropy of your current settings so you can see the effect of every toggle.
The practical takeaway: a long password beats a short symbol-heavy one. Sixteen characters of letters and numbers (~95 bits) is far stronger than eight characters crammed with punctuation (~52 bits), and it is easier to paste from a password manager anyway.
There is also a ceiling worth knowing: beyond roughly 90–100 bits, additional length adds comfort but little practical security, because even nation-state attackers cannot mount a 2⁹⁰ brute-force search. Aim for 80+ bits on anything important and spend your remaining effort on uniqueness — a different password for every account — which is where most real-world breaches actually start.
Choosing the right settings for each account
Not every login needs the same treatment. For your email, banking and password-manager master password, use 20+ characters or a 6-word passphrase — these accounts are the keys to everything else. For everyday sites, 16 random characters stored in a manager is more than enough. If a site imposes a maximum length or bans certain symbols, drop the length to its limit rather than weakening the character pool, and use the ambiguous-character toggle only when you genuinely need to read or hand-type the password on another device.
Passphrases: strength you can actually remember
Passphrase mode strings random words together — think cobalt-river-maple-sunset-piano. Each word is drawn independently from a 7,776-word list, contributing about 12.9 bits of entropy. Five words give you roughly 65 bits; six words push past 77 bits, which is beyond any realistic brute-force attack while remaining easy to type and say aloud.
Passphrases shine anywhere a password manager cannot autofill for you: master passwords, disk encryption, Wi-Fi networks, or accounts you occasionally type on a phone. Toggle the word count and watch the entropy readout climb with every word.
Why use our password generator?
Truly random
Built on the browser's crypto API — the same secure random source password managers and security software use.
Your rules
Length from 8 to 64, any mix of character sets, and ambiguous characters (l, 1, I, O, 0) excluded on request.
Passphrase mode
Memorable 5-word phrases from a 7,776-word list that still deliver 65+ bits of entropy.
Zero transmission
Passwords are generated on your device and never sent, logged or stored — nothing to leak, ever.
Password Generator examples
| Settings | Sample output | Entropy | Rating |
|---|---|---|---|
| 16 chars · all sets | k9#Fm2$vQx!7Lp@z | ~100 bits | Excellent |
| 12 chars · letters + numbers | T7xm2Qp9dKa4 | ~71 bits | Strong |
| 5-word passphrase | cobalt-river-maple-sunset-piano | ~65 bits | Strong |
| 16 chars · ambiguous excluded | G7#eF%2vWx!8Hp@n | ~97 bits | Excellent |
How to use this password generator
Choose a length — 16 or more characters is recommended for important accounts.
Select the character types you need, or switch to passphrase mode for something memorable.
Click regenerate until you are happy, or generate 5 candidates at once and pick a favorite.
Copy the password straight into your password manager — do not retype it by hand.
Common mistakes to avoid
Reusing passwords across sites — One breach compromises every account that shares the password — generate a unique password per site.
Making small edits to an old password — "Summer2024!" becoming "Summer2025!" is trivially guessed — rotate to something fully random instead.
Prioritizing symbols over length — A longer password beats a symbol-heavy short one — add characters before adding punctuation.
Storing passwords in notes or spreadsheets — Use a password manager; plain-text files sync to the cloud and leak in breaches.
Generating passwords on sites that send them to a server — Ours never leaves your device — check the network tab and you will see zero requests carrying it.
