Bcrypt Hash Generator & Verifier
Generate secure bcrypt hashes and verify passwords against existing hashes. Bcrypt is a password hashing function with built-in salt and configurable cost factor for enhanced security.
Hash Generation Settings
0 characters
Higher values are more secure but slower. 10-12 is recommended for most applications.
Bcrypt Hash Result
Hash result will appear here
Enter password and click "Generate" to start
Recommended for Password Storage
- • Industry standard: Bcrypt is the most widely used password hashing algorithm
- • Built-in salt: Automatically generates unique salt for each password
- • Adaptive cost: Stays secure as hardware improves over time
- • Battle-tested: Used by major platforms and frameworks worldwide
- • OWASP approved: Recommended by security experts for password storage
Technical Specifications
- • Algorithm: Based on Blowfish cipher with adaptive key schedule
- • Salt length: 128-bit (16 bytes) random salt
- • Output format: $2b$[cost]$[22 character salt][31 character hash]
- • Cost factor: Exponential (2^cost iterations)
- • Maximum password: 72 bytes (longer passwords are truncated)
- • This tool uses real bcrypt implementation compatible with system tools
Cost Factor Recommendations
About Bcrypt Hash Generator & Verifier
The Bcrypt Hash Generator & Verifier is a professional security tool that creates bcrypt password hashes and verifies passwords against existing bcrypt hashes. Bcrypt is an adaptive password hashing function that incorporates a salt and configurable cost factor (work factor) to protect against rainbow table attacks and ensure computational difficulty increases over time as hardware improves.
Why use a Bcrypt Hash Generator & Verifier?
Bcrypt is considered the gold standard for password hashing because it automatically handles salt generation and provides adjustable computational cost to counter evolving hardware capabilities. Unlike basic hash functions, bcrypt's adaptive nature means it remains secure against brute force attacks as computing power increases, making it the preferred choice for modern web applications and secure systems requiring robust password protection.
Who is it for?
Essential for web developers implementing user authentication systems, security engineers building secure applications, and backend developers managing user credentials. Perfect for full-stack developers working on login systems, DevSecOps teams establishing security standards, and anyone responsible for protecting user passwords in databases and applications.
How to use the tool
Enter the password you want to hash in the password input field
Select the desired cost factor (rounds) - higher values provide more security but require more computation time
Click generate to create a secure bcrypt hash with automatic salt generation
Copy the resulting bcrypt hash for storage in your database or application
For verification, enter both the original password and existing bcrypt hash to confirm they match
Frequently Asked Questions
How do I generate a bcrypt hash in 2026?
Use cost factor 12 minimum — that's the floor for new deployments. Many production setups use 13 or 14 for higher-value services. The cost is exponential: cost 12 = 2^12 = 4096 internal iterations of the Blowfish key schedule, taking roughly 250-400ms on a modern CPU; cost 13 doubles that. Generate the hash with a unique per-user 16-byte salt (every bcrypt library does this automatically). Store the entire 60-character output ($2b$12$saltsalt22charshashashashashashash) in a single VARCHAR(60) or VARCHAR(255) column — the format includes the algorithm, cost, salt, and hash all in one string.
What cost factor should I use for bcrypt in 2026?
Minimum 12. The brief: at cost 10 (~70ms today on modern hardware), brute force against leaked databases is realistic for any common password. At cost 12 (~250-400ms), it's expensive enough to deter casual attackers. At cost 14 (~1.5-2 seconds), even GPU-accelerated cracking takes weeks per leaked password. Reassess every 12-24 months and bump cost as hardware speeds up — a cost factor that took 300ms in 2026 will take 150ms by 2028. Existing deployments at cost 12+ don't need urgent migration to Argon2id; if you're below cost 10, plan a rotation.
Is online bcrypt hashing secure?
Yes when the hashing runs entirely in your browser. This tool uses a JavaScript/WebAssembly bcrypt implementation that executes locally — your password and the resulting hash never leave your device. There's no HTTP request that includes the password, no analytics, no logging. You can verify this in DevTools' Network tab: hashing produces zero requests. For production use, never hash sensitive passwords via a hosted service that runs server-side — use a vetted library (Node.js bcrypt, Python passlib, Go golang.org/x/crypto/bcrypt) inside your application code instead. This tool is appropriate for development, testing, and one-off hash generation.
Is bcrypt still secure or should I migrate to Argon2?
Bcrypt at cost 12+ remains cryptographically sound — OWASP's 2024 Password Storage Cheat Sheet explicitly lists it as acceptable. The reason Argon2id moved to the top recommendation isn't a bcrypt weakness; it's that Argon2 is memory-hard (each hash needs 64+ MB of RAM), which makes GPU and ASIC attacks dramatically more expensive than against bcrypt's 4KB working set. Migrate when you're rewriting auth anyway, when compliance requires Argon2 specifically, or when your bcrypt cost is below 10. For greenfield projects in 2026, start with Argon2id directly. For existing bcrypt at cost 12+, there's no urgency.
Why is my bcrypt hash always 60 characters?
Bcrypt's output format is fixed: $2b$ (algorithm identifier) + 2-digit cost + $ + 22-character base64-encoded 16-byte salt + 31-character base64-encoded 24-byte hash = exactly 60 characters. The format is self-describing — algorithm, cost factor, salt, and hash are all in the same string, which is why you can store it in a single column without separate metadata. The $2a$, $2b$, $2x$, $2y$ prefix variants exist for historical compatibility reasons (different implementations had bugs at various points); $2b$ is the modern canonical version. All of them are interoperable for verification.
Why does bcrypt silently truncate passwords longer than 72 bytes?
Bcrypt's internal Blowfish-based design only processes the first 72 bytes of input — anything beyond is silently ignored. This means passwords like 'correct horse battery staple plus 60 more chars of high entropy' get truncated, and the truncated form is what's actually hashed. For password security, most users won't hit this limit, but it matters for high-entropy passphrases and password manager outputs. Modern bcrypt libraries (and frameworks like Spring Security) work around this by pre-hashing the password with HMAC-SHA256 first, then bcrypting the 32-byte HMAC output. If you support arbitrarily long passwords, pre-hash or switch to Argon2id (no truncation).
Should I add a pepper to my bcrypt hashes?
Only for high-value applications where defense-in-depth justifies the operational complexity. A pepper is a global secret (different from per-user salt) added to the password before hashing — typically stored in your application config or an HSM, not in the database. It protects against database-only leaks: an attacker who steals hashes but not the pepper can't brute-force. The downside: pepper rotation is hard (you must keep old peppers to verify old hashes), and if the pepper leaks you lose the protection silently. For most apps, strong password policy + bcrypt cost 12+ + breach monitoring beats adding pepper. Use for banking, government, healthcare.
How do I rotate bcrypt parameters without forcing users to reset their passwords?
Use the wrap-and-rehash pattern: on every successful login, check whether the stored hash's cost factor matches your current target. If it's lower (or uses a different algorithm), rehash the password with the new parameters and update the database. Over weeks and months, your active user base drifts to the new parameters without any user action. The bcrypt format is self-describing, so checking the stored cost is just parsing the second field of the hash. Combine this with a forced password reset for users inactive for 12+ months — those won't naturally migrate, and inactive accounts are an attack surface anyway.
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