Password Strength Checker
Check how strong your password is. Analyze entropy, crack time, and get suggestions to improve security.
Length
Entropy (bits)
Charset Size
Est. Crack Time
Requirements Check
💡 Suggestions
ℹ️ About Password Strength Checker
Type a password here and it is scored against length, character variety, repeated and sequential runs, keyboard patterns like qwerty, and a built-in dictionary of common passwords that also catches leet spellings such as p@ssw0rd. Alongside the rating you get entropy in bits, the charset size, and an estimated crack time at ten billion guesses per second, plus a button that generates a random 20-character password. Nothing you type leaves your browser — no password is transmitted or stored.
💡 Use Cases
📋 How to use
Type or paste the password you want to test into the password field; the scoring runs in your browser and nothing is sent anywhere.
Click the eye button to unmask the characters so you can check for typos.
Read the strength meter, which rates the password Very Weak, Weak, Fair, Strong or Very Strong with a matching percentage.
Compare the four stats below it: Length, Entropy (bits), Charset Size and Est. Crack Time.
Work through the Requirements Check list, which flags missing character types, repeated or sequential runs, keyboard patterns and known common passwords.
Click Generate Strong Password for a random 20-character replacement, then use the clipboard button to copy it.
💎 Pro Tips
- Paste your content directly — the Password Strength detects common input patterns and applies sensible defaults automatically.
- Use keyboard shortcuts (Ctrl/Cmd+A to select all, Ctrl/Cmd+C to copy) to speed up your workflow inside the Password Strength.
- For very large inputs, break them into chunks — most browser tabs can handle megabytes of text, but parsing huge payloads may freeze the UI briefly.
- The Password Strength does not log or store your input. If you need history, copy important outputs to a local file or note app.
- Combine the Password Strength with other tools on this site (formatters, converters, encoders) to build complete data pipelines without leaving your browser.
❓ Frequently Asked Questions
Yes, fully free with no signup, no API key, no watermarks, and no usage limits.
No. The Password Strength runs entirely client-side in your browser. Your input never touches our servers.
There is no hard limit, but expect slowdowns on inputs larger than a few megabytes, depending on your device's memory.
Yes. Outputs generated with the Password Strength are yours to use freely in any personal or commercial project.
Most of the logic runs in client-side JavaScript, so after the initial load you can often keep working without a network connection.
None. Because the Password Strength runs in your browser, you can process as many inputs as your hardware allows without API keys or throttling.