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Free · No sign-up · Runs in your browser

Free Password Generator.

Create a strong, random password — or a memorable passphrase — using your browser’s own secure randomness. Nothing typed or generated here ever leaves your device.

Not uploaded — nobody sees it Cryptographically random Unlimited passwords No subscription or account
Type
Length
16
Include
Strength: —
Your password is never uploaded — it’s generated right here using your browser’s built-in secure randomness. There’s no server involved, so we never see it, copy it or store it.
How it works

Adjust, and it updates — no waiting on a server

Altto's password generator works right in your browser tab, so there's no upload queue and no “processing” spinner tied to someone else's servers.

01

Pick random characters or a passphrase

Whichever suits where the password is going.

02

Adjust the options

Length or word count, character types, separator.

03

Copy it

One click copies it to your clipboard.

Why this runs in your browser, not on a server

A password generator that sends your new password to a server — even briefly — is a password you can no longer be fully sure only you know. Altto skips that step completely — there’s no server for it to go to.

  • Nothing is uploaded, everEvery password is generated by code that runs in this browser tab, because there’s no server on the other end. That also means we can’t see it, copy it or keep it.
  • No account, no email wallGenerate as many passwords as you like without signing up or handing over an email address.
  • Secure randomnessBuilt on the Web Crypto API, not a predictable pseudo-random number generator.
0

passwords logged on our servers. There’s no server involved at all — everything happens locally, every time.

FAQ

Frequently asked questions

The practical details on what this tool can and can’t do. Need a QR code too? See QR Code Generator.

How random is this?
Passwords are generated using your browser’s built-in Web Crypto API (crypto.getRandomValues), the same cryptographically secure source used by browsers themselves — not a predictable JavaScript Math.random().
Is my password sent anywhere or saved?
No — nothing is ever uploaded. It’s generated entirely inside this browser tab, on your device. There’s no server involved at all, so Altto has no way to see, copy or store what you generate here.
What's the difference between random characters and a passphrase?
Random characters (like xK9$mPq2#vL7n) pack the most randomness into the fewest characters. A passphrase (like Tiger-Meadow-Amber-47) uses several unrelated words instead — longer to type but far easier to read out, remember or type on a phone, while still being genuinely hard to guess.
How strong is a passphrase, really?
This tool picks each word at random from a fixed list of 256 words, so every extra word adds a known, fixed amount of randomness — regardless of which words happen to come up. A 5-word passphrase from a 256-word list is comparable in strength to a random password of well over a dozen characters.
What makes a password strong?
Length matters more than complexity — a longer password using fewer character types is often stronger than a short one using all of them. The strength label here is a simple, general guide, not a guarantee against every attack.
Should I reuse a generated password?
No — use a different password for every account, and consider a password manager to store them so you don’t have to remember each one.
Why does my password sometimes look similar to the last one?
It doesn’t — each click generates a fresh, independent password. Similar-looking runs of letters or numbers can occasionally happen by chance, just as they can with any random string.
Do you keep a log of generated passwords?
No. There's no upload or storage involved. See the Privacy Policy for details.
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