Password Strength Checker
Estimate password entropy, crack time, and get actionable advice.
Password
Analysis
Type a password to see its strength analysis.
About the Password Strength Checker
Analyze a password's entropy, character-class diversity, and common weak patterns to estimate how strong it really is. Get an offline-attack crack-time estimate and concrete advice to improve it — all computed locally in your browser.
Examples
Weak password
password123Output
Very weak — common dictionary word, low entropy.Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Read more
- Choosing a hashing algorithm: MD5 vs SHA-1 vs SHA-256 vs bcrypt
Checksums, digital fingerprints and password storage all use 'hashing' — but the right algorithm depends entirely on the job.
- Choosing a hashing algorithm: MD5 vs SHA-256 vs bcrypt vs Argon2
Cryptographic hashing and password hashing solve different problems. Here's when to use each algorithm and why the wrong choice is a security bug.
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser