Security & EncodingFree online toolNo account requiredNo server uploadUpdated April 28, 2026

Free Online Bcrypt Generator & Verifier

Generate a bcrypt hash from any password, or verify that a plaintext input matches an existing bcrypt hash — all in the browser, with no data sent to a server.

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Configuration

Plain Text Password

bcrypt silently truncates passwords longer than 72 bytes.

Cost Factor (Work Factor)

Cost 12: ~~80ms per hash

Meets or exceeds OWASP recommendation.

Output

Generated Hash

Extracted Salt

OWASP Security Guidance

The OWASP Password Storage Cheat Sheet recommends bcrypt with a minimum cost factor of 10, targeting approximately 1 second of computation on the authentication server. Increase the cost factor over time as hardware improves.

For new systems, prefer Argon2id (see algorithm comparison below) — it offers better memory-hardness and resistance to GPU attacks compared to bcrypt.

The 72-byte password limit in bcrypt is a well-known limitation. Passwords longer than 72 bytes are silently truncated. Consider pre-hashing with SHA-256 if users may have very long passwords (though this introduces its own tradeoffs).

Password Hashing Algorithm Comparison

bcrypt is widely supported, but it is not the only option. Use this table to choose the right algorithm for your project.

Algorithm	Memory	Parallelism	OWASP Rating	Notes
bcrypt	4 KB (fixed)	No	Acceptable (cost ≥ 10)	Widely supported. Max 72-byte password limit. Use cost ≥ 12 for new systems.
Argon2idBest choice	19–64 MB	Yes	First choice	OWASP #1 recommendation. Resistant to GPU and side-channel attacks. Winner of PHC 2015.
scrypt	16–64 MB	Limited	Acceptable	Memory-hard like Argon2. N=32768, r=8, p=1 is the OWASP baseline. Less common library support.
PBKDF2	Negligible	No	Acceptable (≥ 600k iterations)	FIPS-approved. Native in Node.js crypto module. GPU-parallelizable — requires very high iteration count.
MD5 / SHA-1	Negligible	N/A	NEVER use	Cryptographically broken. No work factor. Billions of hashes/second on commodity GPU. For reference only.

OWASP recommendation (2024): Use Argon2id for new systems with minimum parameters: 19 MB memory, 2 iterations, 1 thread. For bcrypt: minimum cost 10, target cost 12+. Never use MD5, SHA-1, or unsalted hashes for password storage.

What is Bcrypt Generator?

Bcrypt Generator & Verifier is a free browser-based tool for hashing passwords using the bcrypt adaptive hashing algorithm and verifying whether a given password matches a stored hash. Bcrypt is the industry-standard algorithm for password hashing in web applications, used by thousands of frameworks and services including Django, Laravel, Rails, Node.js (bcryptjs), and Spring Security.

Unlike SHA-256 or MD5, bcrypt is designed to be intentionally slow through configurable 'cost factor' or 'work factor' (also called salt rounds). The cost factor is a power of 2: cost 10 means 2^10 = 1,024 iterations; cost 12 means 4,096 iterations. This makes brute-force and dictionary attacks exponentially more expensive as compute power grows, while only slightly slowing down legitimate login verification (typically 100–300ms per hash at cost 10–12).

Common uses for this tool: testing how bcrypt hashing feels at different cost factors before choosing one for production, verifying that a stored bcrypt hash was correctly generated from a given password, learning how bcrypt salt and hash output format works ($2a$10$...), and debugging authentication failures in development environments.

How to use Bcrypt Generator in 3 steps

1
Enter the password to hash
Type the plaintext password you want to hash. The input stays in your browser — nothing is sent to a server.
2
Choose the cost factor (salt rounds)
Select a cost factor between 10 and 14. Cost 10 is standard for most apps; cost 12 is more secure but takes longer. Higher values are exponentially slower.
3
Generate the hash or verify a match
Generate a bcrypt hash to copy into your database, or paste an existing hash and compare it against the plaintext to verify a match.

Key features and benefits

Generates bcrypt hashes with configurable cost factor (salt rounds)
Verifies that a plaintext password matches a stored bcrypt hash
Runs entirely in the browser — password input never leaves your device
Useful for authentication testing, debugging, and learning bcrypt format
Shows the full bcrypt output including version, cost, and salt

Common use cases

A developer tests their authentication flow by generating a bcrypt hash at cost 12, inserting it into their test database, and verifying the login works correctly.

A security engineer audits a database export and verifies that stored password hashes follow the expected bcrypt format and cost factor.

A student learns how bcrypt works by experimenting with different cost factors and observing how generation time increases exponentially.

Why browser-based works better

Running bcrypt in the browser means your test passwords never leave your machine, which matters when you are testing with values similar to real credentials.

A dedicated verifier is also faster than writing a Node.js script or setting up a REPL just to check whether a hash matches a password during debugging.

You might also need

Continue this workflow with nearby browser-based tools so you can validate, convert, and ship output without context switching.

References and standards

Bcrypt Generator FAQs

Quick answers about the workflow, privacy, and where this tool fits in a broader job.

What cost factor (salt rounds) should I use?

Cost 10–12 is the standard recommendation for most web applications as of 2026. Cost 10 takes ~100ms per hash; cost 12 takes ~400ms. Choose the highest cost factor that keeps your login response time acceptable.

Is bcrypt safe for storing passwords in 2026?

Yes. Bcrypt remains a widely recommended password hashing algorithm. Alternatives with comparable or stronger security include scrypt and Argon2, which are also memory-hard. All three are far superior to SHA-256 or MD5 for password storage.

What does the bcrypt hash format mean ($2a$10$...)?

$2a identifies the bcrypt version. $10 is the cost factor. The next 22 characters are the salt. The remaining characters are the hash. The full string is self-contained — everything needed to verify a password is in the hash itself.

Can I reverse a bcrypt hash to recover the password?

No. Bcrypt is a one-way function. The only way to 'crack' it is brute force — trying every possible password against the hash — which the cost factor is specifically designed to make slow and expensive.

Does bcrypt have a maximum password length?

Yes. Most bcrypt implementations truncate input at 72 bytes. Passwords longer than 72 bytes are treated as identical up to that limit. For very long passphrases, pre-hash with SHA-256 before bcrypt.

Keep the workflow moving with nearby tools that solve the next likely step.

Reviewed by

The Free AI Tools Editorial Team

Editorial review and product QA

Last updated: April 28, 2026

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What is Bcrypt Generator?

Bcrypt Generator FAQs

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