Why is Bcrypt recommended over MD5 or SHA256 for passwords?

Bcrypt includes an intentional slow-cost factor and unique random salt per password, making brute-force dictionary and GPU rainbow-table attacks computationally impossible.

How do I verify a Bcrypt password hash in PHP?

Use PHP's native password_verify(, ) function. It automatically extracts the salt and cost factor embedded inside the Bcrypt hash.

What is the difference between $2y$, $2a$, and $2b$ Bcrypt hashes?

$2y$ is standard PHP password_hash() format, whereas $2a$ and $2b$ are widely used in Node.js (bcryptjs), Python, Go, and Java. They share the same underlying algorithm and our tool provides 1-click conversion between both formats.

Free Bcrypt & Password Hash Generator & Verifier

1. Hashing Parameters

Plaintext Password

Select Hash Algorithm

Bcrypt Cost Factor: 10 (Default)

Optional Custom Salt

2. Hashed Output & PHP Code

Generated Hash String BCRYPT

PHP Hashing Code

PHP Verification Code

Why Password Hashing with Bcrypt Is Vital for Database Security

Storing user passwords in plaintext or using fast checksum hashes like MD5/SHA-1 leaves your users vulnerable to database breaches. Bcrypt is a key-stretching password hashing function designed specifically to withstand offline dictionary and GPU brute-force attacks.

Embedded Salt

Bcrypt generates a unique 128-bit random salt per password and embeds it directly in the 60-character output string.

Work Factor Cost

Configurable cost factor (e.g. 10 or 12) slows down hash calculation to render rainbow table attacks impossible.

Argon2id Support

Next-generation memory-hard password hashing algorithm winner of the Password Hashing Competition.

Frequently Asked Questions (FAQ)

MD5 and SHA-256 are fast cryptographic hashes designed for checksums. Crackers can generate billions of MD5/SHA256 hashes per second using GPUs. Bcrypt uses a key-derivation cost factor that makes brute-force attacks computationally impossible.

Bcrypt hashes (starting with $2y$ ) embed the algorithm, cost factor, and random salt directly inside the string. PHP's password_verify() reads these parameters automatically and safely verifies the password without exposing plaintexts.

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