Generate strong, random passwords instantly

Why use a random password generator

Weak or reused passwords are the single most common way accounts get compromised: an attacker who finds one leaked password from an old breach will try it everywhere, and a human-chosen password — a name, a date, a familiar pattern — is easy to guess or crack with a wordlist. Security comes down to entropy, the number of bits of genuine unpredictability in a password. A short, all-lowercase word has almost none; a 16-character mix of uppercase, lowercase, numbers and symbols generated from cryptographically secure randomness has enough that brute-forcing it is not practical with current hardware. This generator uses the Web Crypto API rather than a predictable pseudo-random function, so the entropy shown under each password reflects real, uniform randomness, not just a long-looking string with hidden bias baked into the algorithm that produced it.

Passwords vs. passphrases

A character-based password packs the most entropy per keystroke but is nearly impossible to memorize once it is long enough to be safe — which is fine for a password manager, but painful for the handful of credentials you actually need to type from memory. A passphrase takes the opposite trade: it strings together several random words — a curated list of a hundred common, easy-to-spell words in this tool — with a separator and casing you choose, so "river-tiger-comet-willow" is both memorable and still hard to guess, because the words are chosen independently and randomly rather than forming a phrase a human would think of. Reach for a password when you can store it in a manager; reach for a passphrase when you need to type or read it out loud.

Frequently asked questions

How random are the generated passwords?

Every character is picked using the Web Crypto API's crypto.getRandomValues, not Math.random, which is not designed to be unpredictable. The generator also uses rejection sampling when mapping random bytes to character positions, so no character in your chosen set is ever picked more often than another — a naive modulo approach would slightly favor some characters.

Is my password sent anywhere?

No. Generation happens entirely in your browser, and the result is never transmitted to a server, logged, or stored automatically. Copying uses your browser's clipboard API locally, and Pro-only saved presets store only your length and character-type settings in your browser's local storage — never the passwords themselves.

What makes a password strong?

Strength comes down to entropy: how many possible passwords could have been generated with the same settings. The tool calculates this in bits from your character set size and length and labels the result Weak, Fair, Strong, or Very strong. Turning on uppercase, lowercase, numbers, and symbols together, at a longer length, maximizes the character set and therefore the entropy.

How long should a password be?

Longer is better — each extra character multiplies the number of possible passwords. The generator supports lengths from 4 to 64 characters; 16 characters with all four character types enabled is a reasonable default that reaches the Strong or Very strong range shown under the output field.

What's the difference between a password and a passphrase?

A password is a random string of characters from a chosen set — hard to guess but hard to remember. A passphrase, generated from a curated word list, strings together 3 to 12 words with a separator and casing style you pick, trading some entropy per character for something you can actually type from memory. Passphrase mode is a Pro feature in this tool.

Can I reuse generated passwords?

You shouldn't reuse a password across accounts — that defeats the point of generating a strong one, since a single leak then exposes every account that shares it. Generate a fresh password per account instead of reusing one. If what you want to reuse is a configuration rather than a specific password, Pro ($9.99/month or $79.99/year, covering every Toolizto tool) lets you save presets of your length and character-type settings so you can regenerate a fresh password from the same recipe any time — the setting is reusable, the password itself never should be.