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Free Online Bcrypt Hash Generator & Verifier
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This Bcrypt tool generates and verifies Bcrypt password hashes with a configurable work factor, running entirely in your browser. Bcrypt has been a trusted standard for password storage since 1999, built directly on the Blowfish cipher with a tunable cost parameter that lets you deliberately slow down hashing as hardware gets faster over time — this adjustable cost, combined with an automatically generated salt baked into every hash, is exactly what makes bcrypt resistant to rainbow-table and brute-force attacks. Backend developers implementing login systems, security reviewers auditing existing hashes, and anyone verifying whether a given password matches a stored bcrypt hash will find this tool practical for quick checks without spinning up a local script. Both the password and any hash you enter are processed entirely client-side via JavaScript — nothing is ever sent to a server, which matters given you're handling real password material. There's no signup and results appear almost instantly, though higher cost factors take proportionally longer to compute by design. For newer projects, also consider this platform's Argon2 simulator, which OWASP now recommends over bcrypt for greenfield systems. Scroll down to generate or verify a bcrypt hash now.
Features
- Generates standard $2b$/$2a$ bcrypt hashes with configurable cost factor
- Verifies whether a password matches an existing bcrypt hash
- Automatic random salt generation per hash
- Adjustable work factor (cost) from low to high rounds
- Fully client-side computation, no password transmitted
- One-click copy to clipboard
- Standard bcrypt string format output
- Instant feedback with visible cost-vs-speed tradeoff
Why use this bcrypt hash generator & verifier?
- Fast feedback loop for both generation and verification
- Fully private — passwords never leave your browser
- Battle-tested algorithm trusted in production systems for decades
- Easy to use for developers implementing authentication
- Free with no signup or usage limits
Frequently asked questions
Is bcrypt still secure in 2026?
Yes, bcrypt remains a solid, widely trusted choice for password hashing, though Argon2 is now the OWASP-preferred default for new systems due to its memory-hardness.
What is the bcrypt cost factor?
The cost factor (typically 10-14) controls how many rounds of key expansion bcrypt performs; each increment roughly doubles the computation time, letting you balance security against server load.
Does bcrypt need a separate salt?
No, bcrypt generates and embeds a random salt automatically as part of the hash string, so you never need to store or manage salts separately.
Why is bcrypt better than SHA-256 for passwords?
SHA-256 is extremely fast, which makes brute-forcing millions of guesses per second trivial on modern hardware; bcrypt is deliberately slow and tunable, dramatically raising the cost of cracking attempts.
What's the maximum password length bcrypt supports?
The original bcrypt algorithm truncates input at 72 bytes; passwords longer than that are effectively ignored beyond the limit in most implementations.
How do I verify a password against a stored bcrypt hash?
Enter the plaintext password and the stored hash into the verifier — bcrypt extracts the embedded salt and cost from the hash and recomputes it to check for a match.
Is bcrypt better than PBKDF2?
Bcrypt is generally considered stronger against GPU-based cracking than PBKDF2 because it's more memory-intensive, though both are widely used and considered acceptable choices.