bcrypt Hash Generator & Password Verifier (free, no upload)
Hash a password with bcrypt at the cost factor you pick, and verify a password against an existing $2a$/$2b$/$2y$ hash. Free, no upload, in your browser.
Generate a bcrypt hash
Higher = slower and harder to crack. 10 is a common default.
bcrypt is intentionally slow. A higher cost factor doubles the work each step — on purpose — to resist brute-force cracking, so hashing may take a moment.
Verify a password against a hash
🔒 Everything runs in your browser — nothing is uploaded.
Free bcrypt hash generator & password verifier — nothing uploaded
bcrypt is the password-hashing algorithm behind Laravel, Spring Security, Node's bcrypt libraries and countless auth systems. This tool does the two things you need in day-to-day development: generate a bcrypt hash from a password, and verify whether a password matches an existing hash. Both run entirely in your browser with the same bcryptjs implementation used on the server — no password ever leaves your device.
What makes bcrypt different from MD5 or SHA-256
General-purpose hashes like MD5 and SHA-256 are built to be fast, which is exactly what you do not want for passwords — an attacker can try billions of guesses per second. bcrypt is deliberately slow and salted: every hash embeds a random salt, so the same password produces a different hash each time, and a tunable cost factor controls how much CPU each attempt costs. That is why you cannot "decrypt" a bcrypt hash — verification means re-running the algorithm on the candidate password and comparing.
Choosing a cost factor (rounds)
The cost factor is the exponent in bcrypt's work: each increment doubles the time to compute a hash. A value of 10 is a common default; 12 is a stronger choice for modern hardware. Higher numbers resist brute-force cracking better but make every login slightly slower, so pick the highest value your server can compute in a comfortable fraction of a second.
How to generate a bcrypt hash
Type or paste a password, drag the cost-factor slider to the rounds you want, and press Generate hash. Because bcrypt is intentionally slow, a high cost factor takes a noticeable moment — that delay is the security feature at work. Copy the resulting $2b$… string straight into your database seed, config, or test fixture.
How to verify a password against a hash
Paste an existing bcrypt hash and the password you want to check, then press Verify. The tool re-computes the hash using the salt and cost baked into the hash and tells you whether they match — the same check your login endpoint performs. It reads $2a$, $2b$ and $2y$ hashes.
Anatomy of a bcrypt hash
A bcrypt hash looks like $2b$10$N9qo8uLOickgx2ZMRZoMy…: $2b$ is the algorithm version, 10 is the cost factor, and the remaining 22+31 characters are the salt and the hash itself, in bcrypt's own base64 alphabet. Everything needed to verify a password is contained in that one string.
Private by design
Passwords are sensitive, so nothing you type is sent anywhere — hashing and verification happen locally in your browser. That is why there is no sign-up.
Frequently asked questions
Can I decrypt or reverse a bcrypt hash?
No. bcrypt is a one-way hash, not encryption — there is no key that turns the hash back into the password. The only way to check a password is to hash the candidate with the salt stored in the hash and compare, which is exactly what the Verify box does.
Why does the same password give a different hash every time?
bcrypt generates a new random salt for every hash and stores it inside the output. That means two hashes of the same password look completely different, which stops attackers from spotting repeated passwords or using precomputed rainbow tables. Both hashes still verify against the original password.
What cost factor (rounds) should I use?
10 is a widely used default and 12 is a stronger modern choice. Each step doubles the work, so 12 is about four times slower than 10. Pick the highest value your server can hash in a small fraction of a second so logins stay responsive while cracking stays expensive.
Why is bcrypt so slow?
The slowness is intentional. A fast hash lets an attacker try billions of guesses per second; bcrypt's tunable cost factor makes each guess deliberately expensive, so brute-forcing stolen hashes becomes impractical. The short delay you feel when generating a hash is the same delay an attacker faces on every attempt.
How do I verify a password against an existing hash?
Paste the bcrypt hash and the password into the Verify box and press Verify. The tool extracts the salt and cost from the hash, re-computes it for your password, and reports match or no match — the same comparison a login system does. It accepts $2a$, $2b$ and $2y$ hashes.
Is bcrypt still secure in 2026?
Yes, bcrypt remains a solid, widely recommended choice for password storage. Newer algorithms like argon2 and scrypt add memory-hardness, but a bcrypt hash with an appropriate cost factor (10–12+) is still considered safe and is the default in many frameworks.
Is my password uploaded anywhere?
No. Both hashing and verification run entirely in your browser with JavaScript. Your password and hash never leave your device and nothing is sent to a server, which is why there is no sign-up.