Generate strong random passwords free online. Customize length and character types using Web Crypto. No signup, runs in your browser. 100% free, private,.
A password generator creates random, unpredictable passwords using cryptographic randomness. Unlike passwords you make up yourself — which tend to follow patterns, reuse words, or include personal information — generated passwords are statistically random and far harder to crack.
This tool uses the Web Crypto API built into modern browsers. It generates passwords locally on your device without sending any data to a server. The randomness comes from your operating system's cryptographic random number generator, which is the same source used by banking software and encryption tools.
Weak passwords are the number one cause of account breaches. According to security research, over 80% of hacking-related breaches involve weak or stolen passwords. Common problems include:
Password strength depends on two factors: length and character variety. Each additional character multiplies the number of possible combinations exponentially. Adding symbols and mixed case further increases the search space attackers must cover.
A 12-character password using only lowercase letters has about 95 trillion combinations. Add uppercase, numbers, and symbols, and that jumps to over 475 sextillion combinations — making brute-force attacks practically impossible.
Generate a unique password for every account. Use a password manager to store them securely. Enable two-factor authentication wherever available. Never share passwords via email or messaging. Change passwords immediately if a service reports a data breach.
This tool runs entirely in your browser. No passwords are transmitted, logged, or stored on any server. The cryptographic randomness is provided by your device's built-in secure random number generator.
Need to check how strong an existing password is? Try our Password Strength Checker. For generating unique identifiers, check our UUID Generator.
Length is the single strongest lever on password security, and different accounts deserve different lengths. For everyday low-stakes accounts — a news site, a forum — 12 to 14 random characters is comfortably strong. For accounts that protect money or identity — email, banking, cloud storage, password managers — 16 to 20 characters is the sensible baseline. For credentials that guard infrastructure or client data, 24 or more removes brute force from the conversation entirely.
Why does length dominate? Each extra character multiplies the search space by the size of the character set. With all character types enabled, one additional character multiplies the number of possible passwords by roughly 95. Going from 12 to 16 characters makes the search space about 81 million times larger. Attack time grows exponentially with length, which is why a 20-character generated password is not "a bit safer" than a 10-character one — it is a different category of difficulty altogether.
One caveat: some legacy systems cap password length at 8, 12, or 16 characters, or silently truncate longer input. If a site rejects a long password, use its maximum allowed length with full character variety rather than shortening out of habit.
Random strings like kR9#mQ2$vLx7 maximize entropy per character but are hard to type and memorize. Passphrases — four or more unrelated words like copper-lantern-drift-9 — trade some compactness for human usability. A well-chosen passphrase of five random words has comparable strength to a long random string and is dramatically easier to type on a phone or say aloud during setup.
The trap to avoid is inventing a passphrase yourself. Human-chosen word combinations cluster heavily (pets, seasons, favorite teams), which shrinks the effective search space. If you prefer passphrases, they should also come from randomness — either this tool's random mode or a dedicated passphrase option — not from your own associations. In practice, most people need both: a long random string auto-filled by a password manager for most sites, and one or two memorable passphrases for the master password and devices.
Understanding real attack methods makes clear why generated passwords work. Almost no one sits at a login page typing guesses — sites lock out repeated failures. The real threats happen elsewhere:
Generated passwords defeat all three: randomness means they appear in no wordlist, uniqueness means one breach never spreads, and length makes offline cracking infeasible within any realistic timeframe.
The classic advice of replacing letters with lookalike symbols — P@ssw0rd, S3cur1ty! — is outdated and gives false confidence. Cracking wordlists were built decades ago and already include every obvious substitution: a for @, e for 3, s for $, o for 0. To an offline cracker, P@ssw0rd! and Password! fall in essentially the same time.
What actually raises strength is genuine entropy: unpredictable characters in unpredictable order. A random 16-character string is stronger than a cleverly mangled dictionary word many times its length in perceived cleverness. The habit to build is not "make my password trickier" but "make my password random and let a manager remember it."
A password too random to memorize needs a home, and the right home is a reputable password manager — an encrypted vault unlocked by one strong master password. This beats every manual alternative: browser notes and spreadsheets are unencrypted or trivially readable, reusing a "base password" with site-specific endings is predictable, and writing passwords on paper only protects against remote attackers, not anyone near your desk.
After generating a password here, paste it directly into the account's password-change form and the manager's new entry in the same sitting, so the two never diverge. For the master password itself, use the longest output you will reliably type daily — 20 characters of full randomness, stored nowhere but your head. If a manager offers emergency access or secure sharing for family accounts, set those up while you are at it; they prevent the desperate-password-sharing moments that undo good habits.
A strong password and 2FA solve different problems, and you want both. The password proves something you know; the second factor proves something you have (an authenticator code, a security key) or something you are (a fingerprint). If a password leaks in a breach — which can happen even to strong passwords if a service's database is stolen — 2FA is what blocks the attacker at the door.
Strength order for second factors: hardware security keys are strongest, authenticator apps are strong and practical, and SMS codes are better than nothing but vulnerable to SIM-swap attacks. Prioritize 2FA on the accounts that anchor everything else — email first, since password resets for other services flow through it, then banking, cloud storage, and your password manager.
Current guidance from standards bodies like NIST has moved away from the old rules of mandatory symbol requirements and frequent forced changes. The modern recipe is: length above all (at least 8, ideally far more), screening against known-breached passwords, uniqueness across accounts, and no arbitrary composition rules — because composition rules push humans toward predictable patterns like Summer2024!, which crackers model directly. Random generation satisfies every part of this guidance by construction, which is why security professionals lean on generators and managers rather than memorization schemes.
Practically, that means: generate once, store it, and only change a password when there is a reason — a breach report, a shared credential that left your control, or a suspected compromise — not on a calendar.
Done consistently, this routine means a breach at any one service costs you exactly one password change — not a weekend of damage control across fifty accounts.
Yes. It uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically strong random values. No passwords are sent to any server.
At least 12 characters is recommended. 16+ characters with mixed types provides excellent security for most use cases.
No. Passwords are generated entirely in your browser and are never transmitted or stored. Closing the page erases the password from memory.
Symbols dramatically increase the number of possible combinations, making brute-force attacks exponentially harder. A 16-character password with symbols has billions more combinations than one without.
Absolutely. The passwords generated here meet enterprise-grade security standards. However, always follow your organization's specific password policies.
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