What this tool does
Bcrypt Hasher and Verifier creates bcrypt password hashes and checks whether a password matches an existing bcrypt hash.
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Bcrypt Hasher and Verifier
Generate and verify bcrypt password hashes locally in your browser with cost controls and security caveats.
Generate bcrypt hash
Higher cost is slower. This page caps interactive browser hashing at 14 so it stays usable.
Verify password against hash
Result
Ready
Load a sample, generate a hash, or verify an existing bcrypt hash.
Bcrypt security checks
- Uses the audited
bcryptjsimplementation in the browser. - Supports bcrypt hash verification for
$2a$,$2b$, and$2y$-style hashes. - Shows cost, salt prefix, elapsed time, and warnings without exposing the raw password in copied reports.
- Does not replace a production password-storage system, rate limiting, breached-password checks, MFA, or backend policy.
Why it is useful
It helps developers test password-hashing flows, inspect bcrypt cost factors, and verify copied hashes without sending password text to a server.
How it works
The browser loads bcryptjs, generates a bcrypt salt with the selected cost factor, hashes the provided password, or compares a password to an existing bcrypt hash.
Best input
Use test passwords, staging credentials, or locally generated examples. Production password handling should happen inside your backend auth system.
Cost guidance
Higher cost factors slow down both attackers and legitimate verification. Test the cost on the target production hardware before changing real systems.
Privacy note
Hashing and verification run in the browser. Utilito does not intentionally receive the password or hash from this page.
Important limitation
Bcrypt is for password storage, not encryption. Do not email, log, screenshot, or paste real credentials into tools you do not control.
Quick answers
Is bcrypt reversible?
No. Bcrypt hashes are designed for verification, not recovery. You check a candidate password against the stored hash.
What cost should I use?
Use the highest cost that your login system can verify within an acceptable latency budget. Many systems start around 10–12 and benchmark from there.
Can I use SHA-256 instead of bcrypt for passwords?
No. Fast hashes like SHA-256 are useful for checksums, but password storage needs slow salted password hashing such as bcrypt, scrypt, Argon2, or PBKDF2.
Common Use Cases
Generate a staging password hash
Create a bcrypt hash for a test account before pasting it into a local seed file or staging fixture.
Verify a copied hash
Check whether a known test password matches a bcrypt hash from an auth table or framework example.
Benchmark cost factors
Compare elapsed time for cost 10, 11, and 12 before choosing a practical server-side setting.