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Password Strength Checker - Test & Improve

Check how strong your password is

Password

Data Breach Check

Enter a password to see if it has appeared in known data breaches. Only the first 5 characters of its SHA-1 hash leave your device (Have I Been Pwned k-anonymity).

Requirements

Enter a password to check its strength

This tool runs on your device — your files and inputs never go anywhere.

How to Use Password Strength Checker

Check how strong your password is No signup, and nothing gets uploaded for most use.

  1. 1

    Paste your text, URL, or value into the input field.

  2. 2

    Select the options you want to apply.

  3. 3

    Run the tool to see results instantly.

  4. 4

    Copy or download the output.

Why you might like it

  • Nothing to upload — the work happens on your device.
  • Free with no signup, no watermarks, and no daily limits.
  • Works in any modern browser on any device — nothing to install.
  • Usually done in a few seconds, so it doesn't get in your way.
Try Check Password

Frequently Asked Questions

What makes a password strong?▾

Length is the biggest factor. A 14+ character password with mixed character types is dramatically harder to crack than a short one.

Is my password sent anywhere?▾

No. The strength analysis runs entirely in your browser — your password never leaves your device.

What score should I aim for?▾

Aim for the top strength rating before reusing or storing a password, and use a unique password for every site.

Is my password strong?▾

Open the Password Strength Checker tool and paste your text or value into the field and run the tool. The result is generated instantly and ready to download — free, unlimited, and processed entirely in your browser so nothing is uploaded.

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