Free Bcrypt Hash Generator
Generate and verify bcrypt password hashes.
What is the Bcrypt Hash Generator?
Storing passwords as plain text — or even a fast hash like MD5 — is how breaches turn catastrophic. bcrypt exists precisely to make that mistake hard: it's deliberately slow, salts every hash automatically, and lets you dial up the cost as hardware gets faster.
This bcrypt tool generates a hash from any string and verifies a password against an existing hash, so you can test and debug your auth without wiring up code.
Last updated: Aug 13, 2026
What does this tool do?
In generate mode, you enter a password and pick a cost factor, and the tool returns a bcrypt hash (with a built-in random salt).
In verify mode, you enter a password and an existing bcrypt hash, and it tells you whether they match — the same check your login code performs.
Key features
Generate hashes
Create a bcrypt hash from any string.
Adjustable cost
Choose the work factor (rounds).
Verify matches
Check a password against a hash.
Auto-salted
Every hash includes a unique salt.
Not stored
Hashing happens server-side, nothing saved.
Example
Common use cases
- Developers — Generate test hashes for seed data.
- Backend engineers — Debug why a login check fails.
- DevOps — Create an admin hash for a config file.
- Students — Learn how password hashing works.
- Security reviewers — Confirm a hash verifies as expected.
- QA engineers — Seed accounts with known passwords.
- Freelancers — Set up auth without writing a script.
- Anyone testing auth — Hash and verify without code.
Benefits
- It creates properly salted bcrypt hashes instantly.
- It verifies a password against a hash the same way login does.
- It lets you tune the cost factor to match production.
- It saves writing throwaway hashing scripts.
Tips
- Use a cost factor of 10–12 for most production systems.
- Never store passwords in plain text or with fast hashes like MD5/SHA1.
- bcrypt salts automatically — don't add your own salt scheme.
- bcrypt only uses the first 72 bytes of a password.
- Raise the cost factor over time as hardware speeds up.
- Compare with bcrypt's own verify — never by re-hashing and string-matching.
- For very long secrets, consider pre-hashing or use Argon2/scrypt.
- Keep hashes out of logs and version control.
Common mistakes to avoid
Using a fast hash for passwords
Fix: Use bcrypt (or Argon2/scrypt), never MD5 or SHA for passwords.
Adding a custom salt
Fix: bcrypt handles salting internally — don't roll your own.
Cost factor too low
Fix: Use at least 10; higher is stronger, balanced against server load.
Verifying by re-hashing
Fix: Use the compare function — re-hashing gives a different salt and won't match.
How it works
- 1
Enter a password
The string you want to hash.
- 2
Choose cost
Higher rounds mean stronger, slower hashing.
- 3
Generate or verify
Get a hash, or check one matches.
Frequently asked questions
A password-hashing function designed to be slow and resistant to brute-force attacks, with a tunable cost factor. It's a standard choice for storing passwords.
10–12 is typical for production. Higher is more secure but slower; pick the highest your servers can handle comfortably.
A password-hashing algorithm that's intentionally slow and auto-salted, with a tunable cost factor, making brute-force attacks expensive.
10–12 is typical for production. Higher is more secure but slower — pick the highest your servers handle comfortably.
bcrypt uses a random salt each time, so the same password produces different hashes — both verify correctly.
No. Hashing happens on the server for the request and nothing is saved.
bcrypt only processes the first 72 bytes; anything beyond that is ignored.
Yes, it's a solid, widely-supported choice. Argon2 and scrypt are also strong modern options.
Conclusion
A bcrypt generator lets you create and verify password hashes instantly, so you can build and debug authentication with confidence. Pair it with the hash generator and JWT decoder for a complete auth toolkit.