12-Character Password Generator
Generate a strong, random 12-character password instantly in your browser. Free, secure, nothing stored or transmitted.
Click to copy
Twelve characters is the most common minimum that modern websites and services require, and it marks the real floor for a password you intend to keep. With a full mix of uppercase letters, lowercase letters, numbers, and symbols, a random 12-character password carries roughly 78 bits of entropy — enough that an offline attacker testing 10 billion guesses per second would need hundreds of thousands of years to exhaust the keyspace. That said, security professionals increasingly treat 12 as the minimum rather than the target: NIST SP 800-63B sets an 8-character floor, but its updated guidance recommends 15 or more, and 16+ is the practical sweet spot for accounts that matter. This generator builds your password entirely in your browser using the Web Crypto API's crypto.getRandomValues() function — nothing is ever sent to a server, logged, or cached. Generate it, copy it with one click, store it in your password manager, and use a unique one for every account.
Frequently Asked Questions
Is a 12-character password strong enough?
A random 12-character password using all four character types has about 78 bits of entropy, which resists offline brute-force attacks for hundreds of thousands of years at today’s guessing rates. It is genuinely strong, but for high-value accounts — email, banking, your password manager — 16 characters or more gives a larger safety margin at no real cost when you store passwords in a manager.
Is 12 characters the NIST-recommended minimum?
NIST SP 800-63B sets a hard minimum of 8 characters for user-chosen passwords, and its updated guidance recommends a minimum of 15. Twelve characters comfortably exceeds the mandatory floor and is the most common requirement enforced by websites today, but aiming for 15–16 or more is encouraged for sensitive accounts.
Should a 12-character password include symbols?
Including symbols raises the character pool from 62 to roughly 90 or more per position, adding several bits of entropy. It is not strictly required — a 12-character all-alphanumeric password still has around 71 bits — but symbols give a meaningful boost, so enable them on any site that accepts them.
How long does it take to crack a 12-character password?
A random 12-character password with all character types (~78 bits) would take an offline attacker testing 10 billion guesses per second hundreds of thousands of years on average. It is strong today, though longer passwords keep that margin comfortable as hardware improves.
Can I remember a 12-character password?
A random 12-character string is hard to memorize reliably, and you shouldn't reuse one just because it is memorable. Generate a unique password per account and store them in a password manager rather than keeping them in your head.
Is a 12-character password good enough for email or banking?
It clears the bar, but for your most important accounts — primary email, banking, and your password manager — step up to 15, 16, or more characters. Those accounts are worth the extra margin, and a manager makes longer passwords no harder to use.
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Written & reviewed by Andrew Ivanov, Fractional CTO. Last reviewed .