Bcrypt Hash Checker
Verify whether a password matches a bcrypt hash, and inspect the hash structure at the same time. Bcrypt hashes embed their version, cost factor, and salt, so this tool decodes those fields and reports them alongside the verification result.
Checking is the reverse of hashing — the bcrypt Generator produces the digest this tool verifies. If the hash is not bcrypt at all, the Hash Identifier will say so.
How to use the Bcrypt Checker
- 1 Paste the bcrypt hash you want to test against.
- 2 Enter the plain-text value to check.
- 3 Run the check and read whether it matches.
- 4 Clear both fields when you are finished.
How to Use
Paste the bcrypt hash and the plain-text password to test, then click verify. The comparison runs in your browser using a local bcrypt implementation — nothing is uploaded.
- Verifies a password against a bcrypt hash
- Decodes version, cost factor, salt, and digest
- Explains the cost factor in terms of search work
- Validates hash format before attempting a comparison
- All processing stays on your device
Frequently asked questions
Can this recover the original password?
No. Bcrypt is a one-way function, so there is nothing to decrypt. What happens instead is that the candidate is hashed with the salt and cost embedded in your stored hash, and the two results are compared.
How does it know which salt to use?
The salt is stored inside the hash itself, in the $2y$10$… prefix along with the cost factor. That is why a bcrypt hash is self-contained: you need nothing else stored alongside it to verify a password later.
Why does verification take a noticeable moment?
Because that slowness is the security feature. The cost factor forces each attempt to do a fixed amount of work, which is imperceptible for one login but makes millions of guesses impractical. If verification feels instant, the cost factor is probably too low.
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