- At least 12 characters
- Upper case letter
- Lower case letter
- Number
- Symbol
- Not a common password
A password strength checker rates how hard your password is to guess. This free tool runs fully in your browser, so your password never leaves your device.
Does This Password Checker Send My Password Anywhere?
No. The checker runs with JavaScript inside your browser tab. Your password is never sent to a server, never saved, and never shared.
You can prove it yourself. Turn off your internet, then type a password. The meter still works, because all the checking happens on your device.
How Does The Tool Measure Password Strength?
The tool scores two main things: length and variety. Longer passwords with more types of characters score higher.
It checks for six traits and shows each one in the list. Length counts the most, since each extra character multiplies the number of guesses an attacker must try.
- At least 12 characters.
- An upper case letter.
- A lower case letter.
- A number.
- A symbol.
- Not a common password, such as "password" or "123456".
How Is The Crack-Time Estimate Calculated?
The estimate uses the size of your character set and the length of your password. Together they set how many possible combinations exist.
The tool assumes a fast offline attack of about ten billion guesses per second. It then estimates how long trying every combination would take. The table shows how length changes the result.
| Password | Why | Rough strength |
|---|---|---|
| cat | Short, letters only | Very weak |
| Summer2024 | A common pattern | Weak |
| Tr0ub4dour | Mixed but short | Fair |
| correct-horse-battery-staple | A long passphrase | Very strong |
The time is a rough guide, not a promise. Real attack speed depends on the attacker's hardware and the way a site stores passwords.
How Do You Make A Strong Password?
Length is the single best way to make a password strong. Each extra character makes guessing far harder.
- Use at least 12 to 16 characters.
- Mix upper case, lower case, numbers, and symbols.
- Avoid names, dates, and common words.
- Use a different password for every account.
- Store them in a password manager, not a notebook.
A random passphrase of four or five unrelated words is easy to remember and very strong. An example shape is three words, a number, and a symbol.
Why Does Password Strength Matter?
Weak passwords are the easiest way for an attacker to reach an account. A strong password blocks the most common attacks.
Attackers often try leaked passwords from old breaches, a trick called credential stuffing. A unique, strong password stops one leak from unlocking your other accounts. To see how attackers work, read how hackers steal passwords.
Add two-factor authentication where you can. It adds a second step, so a stolen password alone is not enough.
Is This A Real Security Tool Or A Toy?
This is a real, working strength checker, not a prank. It gives honest feedback on length, variety, and common patterns.
It pairs well with our fun tools, but it serves a serious goal: safer passwords. If you came for the playful side, try the Hacker Typer simulator instead.
How Often Should You Change Your Password?
Change a password when you have a reason, not on a fixed schedule. Forced monthly changes often lead to weaker, predictable choices.
Change it right away if a site reports a breach, if you reused it somewhere else, or if you shared it. A strong, unique password can stay in place for a long time when nothing goes wrong.
The bigger win is a different password for every account. That way, one leak cannot unlock the rest.
What Is A Passphrase And Why Is It Strong?
A passphrase is a password made of several unrelated words. Its length makes it both strong and easy to remember.
Four or five random words give a very large number of combinations. You can add a number and a symbol for extra strength. Avoid famous quotes or song lines, since those are easy to guess.
Test a sample passphrase in the tool above. The meter usually rates a long passphrase as very strong.
Can A Strong Password Still Be Stolen?
Yes. A strong password resists guessing, but it does not stop every attack. Theft can happen in other ways.
- Phishing, where a fake page tricks you into typing it.
- Malware, such as a keylogger that records your keys.
- A breach at a company that stored it poorly.
Turn on two-factor authentication to cover these gaps. With it, a stolen password alone is not enough to get in.
Frequently Asked Questions
Does This Password Checker Send My Password Anywhere?
No. The checker runs fully in your browser with JavaScript. Your password never leaves your device, is never sent to a server, and is never stored. You can check the page offline to confirm.
How Does The Tool Measure Password Strength?
It looks at length and the mix of character types. More length and more types of characters raise the score. It also flags very short or very common passwords as weak.
Is The Crack-Time Estimate Exact?
No. The crack time is a rough estimate based on a fast offline guessing speed. Real attack speed varies a lot. Use the result as a guide, not a promise.
What Makes A Strong Password?
Length matters most. A strong password uses at least 12 to 16 characters and mixes upper case, lower case, numbers, and symbols. A random passphrase of several words also works well.
Should I Type My Real Password Into Any Checker?
Only into a checker that runs in your browser, like this one. Never type a real password into a tool that sends it to a server. When unsure, test a similar pattern instead.