Generate and verify bcrypt password hashes in your browser. Adjust the cost factor to control hash strength. Hash a password or verify a plaintext against a stored bcrypt hash.
Open Bcrypt Hasher → free, no sign-inBcrypt is the gold standard for hashing passwords. Unlike fast hash functions like MD5 or SHA-1, bcrypt is deliberately slow — the cost factor is configurable — which makes brute-force attacks computationally expensive. The Bcrypt Hasher lets you generate and verify bcrypt hashes directly in your browser: set the cost factor, hash a password, verify a plaintext against an existing hash.
Developers building authentication systems who need to understand how bcrypt works, verify that their backend is producing the correct hash format, or quickly test whether a plaintext matches a stored hash — without writing a script.
No tutorials. No learning curve. Open it and get started.
No server uploads. The cost factor is adjustable from 8 to 14, so you can see directly how it affects the time taken to compute the hash.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. Bcrypt Hasher was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What is the cost factor?
The cost factor determines how computationally expensive the hashing operation is. Higher values take longer, making brute-force attacks harder. 10–12 is typical for production use.
Is bcrypt reversible?
No — bcrypt is a one-way hash. You cannot recover the original password from a bcrypt hash.
Why is bcrypt slow?
It's designed to be slow to resist brute-force and dictionary attacks. The cost factor controls exactly how slow.
How do I verify a password at login?
Hash the entered password with the same algorithm — bcrypt comparison handles this internally. Use the Verify tab to test this process.
Is this safe to use for learning?
Yes — but generate hashes for actual production credentials using your server-side language's bcrypt library, not a browser tool.
Free. Instant. No sign-in. Open it and get the job done.
Open Bcrypt Hasher on Doathingy.com →