Password Strength Meter

Analyze password strength with time-to-crack estimates — 100% client-side

Your input never leaves your browser — all processing happens client-side.

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Tip: For securely storing and generating strong passwords, consider a dedicated password manager like 1Password or the free and open-source Bitwarden.

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Password Strength Checker — Time-to-Crack Estimator

A strong password is your first line of defense against account compromise. This tool analyzes your password's complexity, entropy, and patterns to give you a realistic strength score and time-to-crack estimate. Everything runs in your browser — your password is never transmitted anywhere.

What is Password Strength Meter?

Password strength is a measure of how long it would take an attacker using automated tools to guess your password. Strength depends on length, character set diversity (lowercase, uppercase, numbers, symbols), and absence of predictable patterns. Entropy — measured in bits — is the mathematical measure of randomness. Each bit doubles the number of possible values, so a 60-bit password requires roughly a trillion times more guesses than a 20-bit password.

How to Use This Tool

  1. 1Type your password into the input field. The strength analysis updates in real time.
  2. 2Use the eye icon to toggle visibility if you need to see what you're typing.
  3. 3Review the strength bar and time-to-crack estimate.
  4. 4Read the specific suggestions below to understand how to improve your password.
  5. 5Try variations until you reach 'Strong' (green) status.

Use Cases

  • ▸Evaluating new passwords before using them for important accounts.
  • ▸Understanding why short or simple passwords are easily cracked.
  • ▸Teaching users about password security in security awareness training.
  • ▸CTF challenges involving password policy analysis.

Is It Safe to Use?

This tool is designed from the ground up for privacy. Your password is processed entirely within the browser's JavaScript engine. No network requests are made. The tool uses pure JavaScript math — no external APIs, no telemetry, no logging. You can verify this by opening DevTools and watching the Network tab as you type.

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Frequently Asked Questions

Is my password safe to enter here?

Yes. This tool runs entirely in your browser — your password never leaves your device. No JavaScript network requests are made when you type. You can verify this in your browser DevTools Network tab.

How is the time-to-crack estimate calculated?

The estimate is based on the password's entropy (bits of randomness) and an assumed attack rate of 10 billion guesses per second — the speed of a modern GPU-based cracking rig. It is a rough estimate intended to illustrate the importance of length and complexity.

What makes a password truly strong?

Length is the most important factor. A 20-character passphrase of random words is stronger than an 8-character mix of symbols. Use at least 16 characters, mix character types, and avoid dictionary words or personal information.

Should I use a password manager?

Absolutely. Password managers like 1Password or Bitwarden can generate and store unique, high-entropy passwords for every site. You only need to remember one strong master password.

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