Password Strength Checker
Check a password's strength and estimated crack time.
Processed locally in your browser. Nothing you enter is uploaded or stored.
- Turns an abstract "is this strong?" into a score, an estimated crack time and specific weaknesses.
- Analysed entirely on your device — the password is never transmitted or stored.
- No account, no limits.
Why this is private
- Processed locally in your browser. Nothing you enter is uploaded or stored.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Estimates a password's strength from its length and character variety, and shows an approximate time to crack it offline — helping you judge whether a password is strong enough before using it.
How to use it
- 1Type a password.
- 2Review its strength score, estimated crack time and any specific weaknesses found.
Tips
- Length matters more than complexity — a 16-character passphrase of random words is typically stronger than an 8-character password with symbols crammed in.
- This never sends your password anywhere — it's typed into your browser and analyzed entirely on your device.
Frequently asked questions
What people use it for
Sanity-check a password before you use itSee whether one you made up is actually hard to guess.
Show someone why a password is weakThe named weaknesses (too short, common word, no variety) make the point concretely.
Compare a passphrase against a complex short passwordWatch the estimated crack time to see why length wins.
Set a policy baselineDecide a minimum length by testing where crack time becomes impractical.
Related tools
All generators toolsSecure Password GeneratorGenerate strong, cryptographically random passwords or memorable word-based passphrases.Hash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes, in hex or Base64, with a compare mode.Secret RedactorScrub API keys, tokens and secrets out of text before sharing it, with custom patterns for your own formats.HMAC GeneratorGenerate an HMAC signature for a message with a secret key.
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Password Strength Checker