Password Generator — Strong Random Passwords, Locally

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Cryptographically random passwords — your length, your character sets, generated on your own device.

Length: 16 characters

A-Z (uppercase) a-z (lowercase) 0-9 (digits) !@#$% (symbols)

How to use this tool

1. Set your length — 16+ is the modern default; 20+ for anything precious.
2. Tick the character sets (the site requiring the password will state its rules).
3. Press Generate and Copy — then store it in a password manager, never a text file.

Example

A 16-character password from all four sets carries ~99 bits of entropy — offline brute-force at a trillion guesses per second would outlive the planet. The same 16 characters from lowercase-only carries just 75 bits, and 'P@ssword1' carries about 10.

The formula

entropy = length × log₂(pool size) · randomness from crypto.getRandomValues (Web Crypto)

What the result means

Password strength is almost entirely a function of randomness and length — substituting '@' for 'a' adds nothing if a human chose it, because crackers try those substitutions first. True random output has no patterns to model, which is why generated passwords can be shorter than memorable ones and still stronger.

Frequently asked questions

Can this site see or store my password?

No. Generation happens in your browser with your device's own random generator; the password is displayed locally and never transmitted. Closing the tab erases it forever.

Is 8 characters still okay?

Not for anything you care about. Modern GPU rigs crack random 8-character passwords in hours. Use 16+ generated characters, or long passphrases where humans must remember.

Why avoid lookalike characters (I, l, 1, O, 0)?

The generator quietly omits them — they cause transcription errors when a password must be typed from paper or read over the phone.

How am I supposed to remember these?

You are not — that is the password manager's job. Remember one strong master passphrase; let the manager hold the rest.

More tools from Safe Harbor

Password Strength CheckerJudge an existing passwordRandom Token GeneratorAPI keys & secretsRandom Number GeneratorFair random drawsHash GeneratorSHA-256 & friends

Explore the island world

• Safe Harbor — the island where this tool lives.
• The Main Island — drive the boat, explore the whole world.
• The 90s Kids Island — where most of us started.

Privacy & data: this tool runs entirely in your browser — nothing you type is uploaded, saved or sent anywhere. · Disclaimer: everything is generated or checked locally in your browser — nothing you type is transmitted, stored or logged anywhere. · Privacy Policy · Disclaimer