Free Online Bcrypt Generator & Password Hash Verifier
Generate bcrypt password hashes instantly and verify them against plaintext passwords — 100% client-side processing. Your passwords never leave your browser. No sign-up, no tracking, no server.
Higher rounds = stronger security but slower hashing. 12 is the recommended default.
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Last updated: May 21 2026
Reviewed by the QuickTooly Team
Bcrypt Generator Guide
Why Use QuickTooly's Bcrypt Generator?
- 100% client-side: Your passwords are hashed entirely in your browser — they are never sent to any server.
- Adjustable cost factor: Choose rounds from 4 to 14 to balance security and performance for your use case.
- Built-in verifier: Paste any bcrypt hash and plaintext password to confirm they match — no coding required.
- Developer-friendly output: Hashes are in the standard
$2b$format compatible with all major frameworks. - Instant & free: No registration, no rate limits, no watermarks — just fast, reliable bcrypt hashing.
What Is Bcrypt?
Bcrypt is a password-hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. It was presented at USENIX in 1999 and remains one of the most widely recommended algorithms for storing passwords securely. Unlike general-purpose hash functions like MD5 or SHA-256, bcrypt is intentionally slow — its cost factor can be increased over time to keep pace with faster hardware.
Every bcrypt hash includes a random 128-bit salt, which means two identical passwords will always produce different hashes. This prevents rainbow table attacks. The resulting hash string encodes the algorithm version, cost factor, salt, and hash value in a single portable string like $2b$12$....
Understanding the Cost Factor
The cost factor (also called work factor or rounds) is the key parameter that controls how computationally expensive hashing is. The number of iterations is 2^rounds:
- Rounds 4–8 — Very fast (<1 ms). Only suitable for testing or low-security scenarios.
- Rounds 10–11 — Fast (~50–100 ms). Common in older applications.
- Rounds 12 — Recommended default (~250 ms). Balances security and UX for most web apps.
- Rounds 13–14 — Slow (~500 ms–1 s). Suitable for high-security contexts where latency is acceptable.
OWASP recommends a minimum of rounds 10, with rounds 12 as the practical standard for new applications as of 2024.
How to Use This Bcrypt Generator
Generating a bcrypt hash takes just a few seconds:
- Enter your password in the input field on the Hash tab
- Select a cost factor — 12 is recommended for most applications
- Click "Hash Password" and wait a moment while the hash is computed
- Copy the hash and store it in your database
- Use the Verify tab anytime to confirm a plaintext password matches a stored hash
Frequently Asked Questions
Is my password safe when using this tool?
Yes, completely. This tool uses the bcryptjs library which runs entirely in your browser. No data is transmitted to any server — your password never leaves your device. You can verify this by disconnecting from the internet and refreshing the page; the tool will still work.
Can I reverse a bcrypt hash to get the original password?
No. Bcrypt is a one-way hash function — it is computationally infeasible to reverse. The only way to "crack" a bcrypt hash is to try many passwords and check each one against the hash, which is exactly what the cost factor is designed to make prohibitively slow.
What cost factor should I use in production?
OWASP recommends a minimum of 10, with 12 as the practical default for new applications. Choose the highest value that keeps your login endpoint under your acceptable latency budget (typically 300 ms–1 s). Increase it every few years as hardware gets faster.
Why does every bcrypt hash look different for the same password?
Bcrypt automatically generates a new random 128-bit salt for each hash operation. The salt is embedded in the resulting hash string. This means two hashes of the same password will always look different, which is intentional — it prevents attackers from identifying accounts that share the same password.
What is the $2b$ prefix in a bcrypt hash?
The prefix identifies the bcrypt algorithm version. $2b$ is the current standard (fixed in 2014). You may also encounter $2a$ (older, has a known bug for certain inputs) or $2y$ (PHP variant). All are interoperable for normal passwords. This tool generates $2b$ hashes.
What frameworks support bcrypt natively?
Virtually all major backend frameworks have bcrypt support: Node.js (bcrypt, bcryptjs), Python (bcrypt, passlib), PHP (built-in password_hash()), Ruby (bcrypt gem), Java (Spring Security), and Go (golang.org/x/crypto/bcrypt). Hashes generated here are fully compatible with all of them.