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パスワード強度チェッカー

Password strength checker: evaluate length and complexity with crack time and tips locally offline for safety, with one-click copy and multilingual.

使い方

パスワードを入力すると強度、エントロピー、推定クラック時間がリアルタイム表示され、改善アドバイスも表示。

Overview

Password Strength Checker is a Generator tool. Evaluate length and complexity with crack time and tips locally offline for safety, with one-click copy and multilingual. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Password Strength Checker: Type a password to see its strength, entropy and estimated crack time, plus tips to improve it. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Password Strength Checker offline or on poor network — all calculations stay local and private.
  • Create UUIDs and short strings
  • Mock data for testing

How to use

  1. 1 Type a password to see its strength, entropy and estimated crack time, plus tips to improve it..
  2. 2 Set length/charset rules
  3. 3 Preview and lock/exclude items
  4. 4 Copy or export CSV/TXT

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Uses Crypto API
  • Batch export in chunks for thousands
  • Mock data for testing only

FAQ

Reproducible?
Fix seed or export log if needed.
How random?
crypto.getRandomValues with system entropy.
How is Password Strength Checker different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “password strength, entropy” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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すべての計算はブラウザ内で実行され、データはアップロードされません。