Bcrypt Generator
Generate bcrypt password hashes with adjustable cost.
Bcrypt is a password hashing function built to be slow on purpose. Unlike SHA-256 or MD5, each bcrypt hash embeds a salt and a cost factor so offline guessing is expensive. Utilitoo's Bcrypt Generator produces standard bcrypt hash strings in your browser so you can seed test users, compare library output, or teach password storage without installing a CLI.
Typical uses: invent disposable passwords for local databases, confirm your app's bcrypt cost matches fixtures, and show students what a $2a$/$2b$ hash looks like end-to-end. Set cost from 4 (fast demos) to 15 (heavy). Cost 10 is a common development default; production systems often choose 12+ after measuring login latency.
Enter a test string, choose the cost, click Generate bcrypt hash, and copy the full result (algorithm prefix, cost, salt, and hash). Pair with Password Generator for strong test inputs, Password Strength Checker before you reuse a phrase elsewhere, and SHA-256 Generator only when you need a fast integrity digest - never as a password substitute.
Hashing is client-side. Still avoid pasting real production user passwords on shared machines or screen shares. Prefer throwaway credentials, then rotate anything that might have been visible.
Bcrypt Generator creates salted, costed password hashes entirely in your browser. It is for development, fixtures, and teaching - not a substitute for production key management or Argon2 policies your security team may require.
Common use cases
- Seeding local or staging user tables with bcrypt hashes for disposable test passwords.
- Comparing your app's bcrypt cost and output format with a known browser-generated hash.
- Teaching password hashing workshops without installing bcrypt CLIs on every laptop.
- Creating fixture hashes for integration tests that assert login against stored digests.
- Demonstrating why bcrypt (slow + salted) differs from SHA-256 for credential storage.
Tips & common mistakes
Use throwaway passwords only - never paste production user credentials on a shared screen. Cost 4-6 suits fast tests; ~10 for everyday local work; 12+ when approximating production after measuring verify latency. This page generates hashes only - verify with your application's bcrypt compare. Prefer Password Generator for strong test inputs and Password Strength Checker before reusing a phrase elsewhere.
Common errors
- Cost too high freezes a low-power device - lower the factor for demos, then retest production settings on server hardware.
- Copied hash includes trailing whitespace from chat - trim before inserting into SQL or env fixtures.
- Expecting verification on this page - generation only; use your app's verify helper to check passwords.
How to use
- Enter a disposable password or test string (avoid real production credentials).
- Choose a cost factor - lower for fast tests, higher for production-like hashing.
- Generate a hash, or switch to Verify to check a plaintext against an existing $2... hash.
Frequently Asked Questions
How do I generate a bcrypt hash online?▼
Type a password or test string, pick a cost factor, and click Generate bcrypt hash. Copy the full string including the $2... prefix, cost, salt, and digest.
What bcrypt cost factor should I use?▼
Use 4-6 for snappy unit tests, around 10 for everyday local development, and 12+ when you are approximating production policy - always measure verify latency on your hardware.
Is bcrypt the same as SHA-256 or MD5?▼
No. Bcrypt is a password KDF with salt and work factor. SHA-256 and MD5 are fast hashes for integrity and fingerprints, not for storing passwords. For when each belongs in an app, see the blog guide Bcrypt vs SHA-256 for Passwords.
Can this tool verify a password against a bcrypt hash?▼
Yes. Switch to Verify password, paste the plaintext and the $2... hash, then click Verify. Comparison runs locally in your browser.
Are passwords uploaded when generating bcrypt hashes?▼
No. Utilitoo runs bcrypt in your browser. Use disposable test passwords anyway if anyone else can see your screen.
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