Tool
What the Common Password Checker does
Common Password Checker: checks Result from Password. Example: password password123 gives result OK.
The inputs are Password; the output is Result. There is no submit step; the numbers move as you adjust them.
It is mostly used by anyone replacing a weak password. A secret that travels to a third-party server is no longer entirely a secret.
No sign-up, no data collection, no processing queue, just code running locally.
The field reference, the method and a worked example using the default inputs follow the tool itself.
What do the Common Password Checker fields mean?
The Common Password Checker uses 1 input. The starting figures are ordinary, not edge cases, so they make a sensible baseline.
| Field | What to enter | Default |
|---|---|---|
| Password | required | password123 |
How does the Common Password Checker work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same check.
An empty or malformed field stops the calculation rather than being treated as zero.
Worked example
These are the values the Common Password Checker loads by default, and the result it produces from them. The defaults produce the result shown here; change any of them and the answer moves.
| Password | password123 |
|---|
| Result | OK |
|---|
What "common" means here, and what it does not
This check runs entirely in your browser against a small, fixed, illustrative list of frequently-breached passwords. It is deliberately not a lookup against a live breach database. A static site cannot query one without sending your password somewhere, which this category is built specifically not to do.
| This tool’s list | ~30 entries | Illustrative only: catches instant, top-of-list guesses |
|---|---|---|
| A real breach corpus (e.g. Pwned Passwords) | hundreds of millions of entries | What an actual attacker checks first |
Worth knowing
- Passing this check only means the password is not one of a handful of the most infamous leaked passwords ever recorded. It says nothing about whether it appears in the hundreds of millions of real passwords exposed across other breaches.
- A k-anonymity API, the model behind Have I Been Pwned’s Pwned Passwords service, lets a service check a password against a full breach corpus while only ever transmitting the first five characters of its hash. It is worth knowing as the standard real-world approach, even though this static, client-side tool does not implement it.
- A password not being "common" is a low bar on its own. Pair this check with the entropy-based strength checker rather than using either alone.
Read next: What Actually Makes a Password Strong
How to use it
- Key in Password.
- It runs on every change, so there is no moment where the screen is out of date.
- Read Result in the results panel.
- If you need a record, Copy Link saves the inputs and Print produces a clean page.
What this tool does not do
- Anything generated here is only as safe as wherever you store it afterwards.
- Randomness comes from your browser cryptographic source, which is suitable for real secrets.
- Intermediate steps are rounded only for display; if you need full precision, work from the source figures.
Frequently asked questions
Just Password. A starting value is in place for each, so you can change one value at a time and watch how the result responds.
With the values loaded when the page opens, result comes out as OK. Edit any input and that figure moves with it.
No. Nothing is transmitted or logged, which is the only acceptable design for a tool that handles credentials.
No cost and no account. Use it as often as you like.
There is no estimation step. The result is computed, not inferred.