Content is loading…
Check password strength: entropy, crack time, patterns, and breach check.
Analyzed locally — never leaves your browser.
Analyze the strength of any password instantly. See entropy bits, estimated crack time for online and offline attacks, character set analysis, and pattern warnings (sequences, repetition, keyboard walks, common words). Optionally check if your password has appeared in known data breaches using the Have I Been Pwned API (k-anonymity — your full password is never sent). All analysis runs locally in your browser.
The Password Strength Checker provides instant, local analysis of password security using entropy bits, crack time estimations, and pattern detection. It features an optional breach check via the Have I Been Pwned API utilizing k-anonymity to protect user privacy. Because all core analysis runs directly in the browser without requiring registration, users can evaluate passwords quickly and securely.
Good to know: Users seeking automated password generation or bulk auditing capabilities may need to use complementary security tools.
Follow these steps to analyze your password's entropy, crack time, and potential breach status using our secure local analysis tool.
Enter your password into the input field
Type or paste the password you wish to analyze into the secure text area. All analysis is performed locally in your browser to ensure your data remains private.
Review entropy and character set analysis
Check the calculated entropy bits and character set diversity to understand the mathematical complexity of your password.
Analyze estimated crack time and patterns
Examine the estimated time required for online and offline attacks. Look for warnings regarding sequences, keyboard walks, or common dictionary words.
Perform an optional data breach check
Use the Have I Been Pwned integration to see if your password has appeared in known leaks. This uses k-anonymity so your full password is never transmitted.
Adjust your password based on results
If the strength is low or patterns are detected, modify your password until the checker confirms it meets high security standards.
Estimated time: PT1M
Share this tool
AES-256-GCM encrypt and decrypt text with a passphrase — runs in your browser.
Generate HMAC-SHA256/512 signatures for API authentication and webhooks.
Build and sign JWTs with HS256/384/512. Verify signatures. Runs in your browser.
Generate live TOTP/2FA codes from a base32 secret. Scan QR with any authenticator.
Compute SHA-1/256/384/512 of any file and verify integrity — 100% browser-based.
Hash passwords with bcrypt and verify hashes — adjustable cost factor, runs locally.
Convert text or Markdown to a Word .docx file with live preview, RTL, and page-setup options.
Draw a Secret Santa with exclusions and share a private reveal link for each person.
Make custom bingo cards from your own words — play, print, or share a link.
Convert images to video with the Ken Burns zoom/pan effect. Add music and export as WebM.
Load and compare multiple URLs side by side in resizable iframes.
Rank anything with quick 1-v-1 matchups → a full ordered list you can share.
Convert Markdown to a fully customized, RTL-ready PDF.
See your public IP address plus full location, ISP, ASN, timezone, coordinates, and more.
