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Bcrypt Generator & Verifier

10

210 = 1,024 key-expansion rounds — balanced — common default for servers.

Hashing runs entirely in your browser, which is great for testing and learning — but it is not a replacement for server-side hashing during real authentication. Never send plaintext passwords to the client to hash them there. Raising the cost factor strengthens the hash but slows every login by design.

What This Tool Does

Bcrypt Generator & Verifier is built for deterministic developer and agent workflows.

Generate and verify bcrypt password hashes entirely in your browser with an adjustable cost factor.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/bcrypt-generator/

For automation planning, fetch the canonical contract at /api/tool/bcrypt-generator.json.

How to Use Bcrypt Generator & Verifier

  1. 1

    Enter the password to hash

    In Hash mode, type the password you want to protect. The tool produces a standard bcrypt string beginning with $2 that already contains its own random salt.

  2. 2

    Set the cost factor

    Drag the cost slider between 4 and 15. Higher values strengthen the hash against cracking but make each hash slower to compute, which the readout explains as you adjust it.

  3. 3

    Generate and copy the hash

    Run Generate Hash, wait through the brief loading state at high cost factors, then copy the result for storage, seeding, or a test fixture.

  4. 4

    Verify an existing hash

    Switch to Verify, paste a bcrypt hash and a candidate password, and check whether they match before relying on the credential.

Frequently Asked Questions

What does this bcrypt tool do?
It hashes a password with bcrypt and an adjustable cost factor, and it verifies whether a plaintext password matches an existing bcrypt hash. The salt is embedded in the hash, so no separate salt storage is needed.
Which cost factor should I choose?
Each step doubles the work. 10 is a common server default; 12 is stronger but noticeably slower. Pick the highest value your login latency budget tolerates, since a slower hash is harder to brute force.
How do I verify a password against a hash?
Switch to Verify, paste the stored bcrypt hash, type the password to check, and run it. The tool reports a clear match or no-match using a constant-time comparison from the bcrypt library.
Is this safe to use for real authentication?
Use it for testing, learning, and generating sample hashes. Production logins should hash on the server. Never send a user's plaintext password to the browser to be hashed there.
Does my password leave the browser?
No. Hashing and verification run client-side with the bcryptjs library. Passwords and hashes stay in the page and are never transmitted.