Password Strength Checker — Test Without Judgement

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Type a test password — see its entropy, estimated crack time, and every weakness. Stays on your device, guaranteed.

Password to test (never leaves this page)

Test with a similar-shaped password if you are cautious — same length and pattern, different characters. The analysis works the same.

How to use this tool

1. Type or paste the password to test — it stays in this page's memory only (use the show/hide toggle).
2. Read the entropy bits, the verdict bar and the crack-time estimate.
3. Fix every finding the checker lists, then re-test.

Example

P@ssword123 tests as 10 chars but the checker finds the common word, the word+digits pattern and the substitution — effective strength collapses to WEAK. A random 16-character output from the Password Forge scores ~99 bits: VERY STRONG.

The formula

effective bits = effective length (patterns removed) × log₂(character pool) · crack time at 10¹² guesses/sec

What the result means

Crackers don't brute-force blindly — they try wordlists, patterns and substitution rules first, so 'P@ssword1' falls in seconds despite its 9 characters. Real strength = randomness the attacker cannot model. The crack-time figure assumes an offline attack on a leaked hash, the worst realistic case.

Frequently asked questions

Is it safe to paste my real password here?

The page has no network calls and no storage — the check runs in your browser only. If uneasy, test a similar-shaped dummy (same length, same pattern).

What is a good target?

70+ bits for accounts that matter, 100+ for master passwords and encryption keys. Length is the cheapest way up: each random character adds 5-6 bits.

Why does the checker say 8 random chars are only FAIR?

Because GPU rigs really do crack random 8-character hashes in hours when they steal the hash. Online logins are rate-limited; leaked-password cracking is not.

Does adding '2024' to a word help?

It adds a pattern, not strength — 'word+year' is among the first rules every cracking engine tries.

More tools from Safe Harbor

Password GeneratorGenerate a strong oneHash GeneratorSHA-256 & friendsRandom Token GeneratorAPI keys & secretsRandom Group PickerFair team sorting

Explore the island world

• Safe Harbor — the island where this tool lives.
• The Main Island — drive the boat, explore the whole world.
• The 90s Kids Island — where most of us started.

Privacy & data: this tool runs entirely in your browser — nothing you type is uploaded, saved or sent anywhere. · Disclaimer: everything is generated or checked locally in your browser — nothing you type is transmitted, stored or logged anywhere. · Privacy Policy · Disclaimer