Trusted password security
Your passwords, uncrackable.
Generate strong passwords and PINs, see if yours has leaked in a breach, and learn exactly what to avoid — all in your browser. Privacy-first, with no account and no tracking.
In-browser tools · no account · no tracking
The toolkit
Everything you need to lock things down.
Four focused tools. No account, no tracking, no nonsense.
Password & PIN generator
Cryptographically-random passwords and PINs with a live strength read-out.
OpenBreach & strength checker
Test any password or PIN for strength and whether it’s turned up in a breach.
OpenCommon passwords to avoid
The most-breached passwords by length — see what attackers try first.
OpenStrong, memorable examples
A hundred passwords that are easy to remember and hard to crack.
OpenHow it works
Strong in three taps.
Generate
Pick a length and character types. We draw from your device’s secure randomness — never a server.
Check
Confirm it’s strong and that it hasn’t appeared in any known breach corpus.
Save it safely
Copy it into your password manager. We don’t keep your passwords — close the tab and they’re gone.
Why CheckPasscode
Security you can actually verify.
Private by design
The generator and strength checks run in your browser, and we don’t sell, profile, or publish what you enter.
True randomness
Keys come from the Web Crypto API with unbiased sampling — not a predictable pseudo-random seed.
Breach-aware checks
Flags passwords that match known weak and widely-breached patterns, so you can avoid the obvious.
Works offline
Install it once and the whole toolkit keeps working with no connection — a true progressive web app.
Don’t guess — know
Has your password already leaked?
Most people reuse a password that’s already in a breach list. Check yours in seconds — privately, right here.
Run a free checkWhat we promise
Built to be trusted.
No account, no sign-up, no email. Open the page and every tool just works.
We don’t run ads or sell data. There’s no data business here to tempt us.
Install it to your home screen and the whole toolkit keeps working offline.
Questions
The details, answered.
Do you store or see my passwords?
There’s no account, so nothing you generate is tied to you, and we don’t sell, publish, or build profiles from what you enter. The generator runs entirely in your browser.
How are passwords generated?
With the browser’s Web Crypto API using unbiased rejection sampling, so every character is uniformly random — not a guessable pseudo-random sequence.
How does the breach check work?
It flags passwords that match known weak and commonly-breached patterns, right in your browser — a fast way to catch the obvious risks without signing in anywhere.
Is it really free?
The toolkit is free to use. We don’t run ads or sell data — the product is the point.
Can I use it offline?
Yes. Add it to your home screen and the whole toolkit keeps working with no connection.
Create a password worth trusting.
It takes about three seconds. Your future self will thank you.
Open the generator