Santekno/tools
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Password Strength Meter

Estimate password strength using zxcvbn. Reports score 0–4, crack-time estimates, and improvement tips.

Processed in your browserUpdated · Jan 2026
Input
0 chars
Output
0 chars

How to use Password Strength Meter

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

  • Paste or type your input in the INPUT panel
  • The output regenerates automatically as you type
  • Use Copy to put the result in your clipboard
  • Click Sample to load a working example

What is Password Strength Meter?

Password Strength Meter analyzes any password using zxcvbn — the same algorithm Dropbox built and widely adopted across the industry. It computes a score 0–4 (very weak → very strong), the log10 of expected guesses, and crack-time estimates against four attacker scenarios (online throttled, online unthrottled, offline slow hashing, offline fast hashing). Feedback includes a warning (if any) and suggestions tailored to weaknesses found. The password never leaves your browser and is not stored anywhere. Need a new password? Use the Password Generator to create one, then paste it here to verify the score. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

  • Debugging API payloads and integration issues
  • Inspecting tokens, hashes, or encoded strings during development
  • Generating fixtures and sample data for tests
  • Sharing readable output with teammates in code reviews

FAQ

0 = trivially guessable (top 1k passwords); 1 = guessable in <10²; 2 = ~10⁶ guesses; 3 = ~10⁸ guesses (safe from unthrottled online); 4 = ~10¹⁰⁺ (safe from offline slow hashing).