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Password Strength Checker

Estimate password entropy and crack time, detect common passwords and patterns, and get tips. Nothing is sent anywhere.

Runs in your browserPassword → Report
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Example

Input
Summer2024!
Output
Strength: Very weak ■□□□□
Estimated entropy: 10 bits

Length: 11 characters
Lowercase: yes · Uppercase: yes · Digits: yes · Symbols: yes

Estimated time to crack:
  Online attack (100 guesses/hour): 5 hours
  Offline, slow hash (10 thousand/s): less than a second
  Offline, fast hash (10 billion/s): less than a second

Warnings:
  • This is one of the most commonly used passwords and would be guessed almost instantly.

Suggestions:
  • Use at least 12 characters; 16 or more is better.
  • Avoid dictionary words, names, dates and patterns, or use a random passphrase of 5+ words.
  • Consider a password manager to generate and store a long random password.

How to use the Password Strength Checker

  1. Paste or type your Password into the input area, or open a file from your device.
  2. Adjust the options above the editor if the tool offers any.
  3. Review the Report result, then copy it or download it as a file.

Privacy and limitations

  • Your data is processed on your device and is not uploaded to any server.
  • The estimate is heuristic: it checks character variety, patterns and a short list of very common passwords, not full breach databases.

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