Bcrypt Hash Generator & Checker

Generate Bcrypt hashes locally and verify passwords against existing hashes with adjustable Cost/Rounds for auth development, migrations, and seed data.

Click for theater mode

Generate Bcrypt Hash

Enter a password, choose Cost/Rounds, and generate a salted Bcrypt hash locally.

Ready

Check Password Against Hash

Paste a plain password and a Bcrypt hash to confirm whether they match.

Waiting to verify

Passwords and hashes are processed only in your browser. Bcrypt is one-way and cannot be decrypted.

How to Use

  1. Paste the password you want to protect, such as an admin seed password or a test account password.
  2. Adjust Cost/Rounds. The default is practical for browser testing; use a lower value for quick checks.
  3. Click "Generate Bcrypt Hash" and copy the result into your backend config, fixtures, or seed script.
  4. Paste a password and Bcrypt hash into the checker, then verify whether they match.

Core Features

  • Generate Bcrypt hashes and verify passwords in one compact workflow
  • Process passwords and hashes locally in the browser without uploads
  • Adjust Cost/Rounds from 4 to 12 to test different work factors
  • Copy generated hashes and reuse them immediately in the checker
  • Treat Bcrypt correctly as a one-way password hash, not decryptable text

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Calculation Logic

Bcrypt adds a random salt to every generated hash and stores the version, Cost/Rounds, and salt inside the final string. That is why the same password can produce different hashes while still verifying successfully.

Unlike plain MD5/SHA text hashes, Bcrypt uses a work factor to make each password guess more expensive. Verification does not decrypt the hash. It reads the stored parameters, recomputes the password hash, and compares the result.

This tool uses a pure JavaScript Bcrypt implementation and caps the browser Cost at 12. Higher costs are slower and should be evaluated in your backend runtime rather than blocking a browser tab.

FAQ

Can a Bcrypt hash be decrypted?

No. Bcrypt is a one-way password hashing algorithm. It can generate and verify hashes, but it cannot recover the original password.

What is the Cost or Rounds factor?

Cost/Rounds is Bcrypt's work factor. Higher values make generation and verification slower, which also raises the cost of bulk password guessing. This browser tool limits the range to 4 through 12.

Why does the same password create different hashes?

Bcrypt generates a new random salt each time. Different hashes can still verify against the same password.

Are passwords sent to a server?

No. Generation and verification run in your current browser session.