Password Strength Checker
Entropy in bits and a realistic offline crack estimate.
IT Password Policy — Ready-to-Adopt Template
A NIST SP 800-63B aligned policy document you can rename, sign and hand to an auditor.
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About this tool
Strength is entropy, not decoration. This checker computes the search space from the character classes used and the length, then estimates crack time against a modern offline GPU attack.
What entropy means
Each bit doubles the search space. Below 60 bits an offline attacker wins quickly; 80 bits and above is comfortable for high-value accounts.
Passphrases beat complexity rules
Four or five random words outperform a short password stuffed with symbols, and people actually remember them.
How to use Password Strength Checker
- 1
Open Password Strength Checker
Everything runs on this page — there is nothing to install and no account required to use the free features.
- 2
Add your input
Paste or enter your values in the panel above. The tool updates as you type, so you can iterate quickly.
- 3
Review the output
Check the result, copy it with one click, and adjust the options until it matches what your system expects.
- 4
Take it further
Use the security & infrastructure tips below to make the result production-ready, then unlock the gated extras via the form above.
Best practices
- Treat every result as a snapshot — configuration drifts, so re-check after each deploy.
- Fix the highest-impact finding first rather than chasing a perfect score.
- Apply changes at the shared layer (proxy, CDN, base image) so every service inherits them.
- Document what you changed and when; auditors and future teammates will ask.
Why Password Strength Checker matters
Infrastructure and security misconfigurations are among the most common root causes of real incidents, and almost all of them are cheap to fix once visible.
Leaving them unaddressed means failed audits, blocked enterprise deals, and avoidable exposure.
Related free & paid tools
| Tool name | Type | Key features | Link |
|---|---|---|---|
| zxcvbn | Free | Realistic strength estimation used by this tool's approach | Visit |
| Have I Been Pwned | Free | Check whether a password appears in a breach | Visit |
| 1PasswordOffer | Paid | Generates and stores strong unique passwords | Visit |
| NordPassOffer | Freemium | Password manager with breach scanning | Visit |
Links marked Offer may be partner links. They cost you nothing extra and never affect which tools we recommend.