Bcrypt Generator & Password Hash Checker — Secure Hashing Free

Storing passwords in plain text — or even in a basic SHA-256 hash — is a critical security vulnerability that exposes every user in your database the moment it's breached. Modern secure applications use Bcrypt, a password hashing algorithm specifically designed to be slow and computationally expensive, making brute-force and rainbow table attacks impractically time-consuming. Our free Bcrypt generator lets you instantly generate a Bcrypt hash from any plaintext password and verify whether a given password matches a stored hash — essential utilities for developers implementing or auditing authentication systems.

Why Bcrypt Is the Right Tool for Password Hashing

General-purpose cryptographic hash functions like MD5, SHA-1, and even SHA-256 were designed to be fast — they can compute billions of hashes per second on modern GPU hardware. This speed is catastrophic for password security: an attacker who obtains a database of SHA-256 password hashes can attempt billions of common password guesses per second.

Bcrypt solves this by incorporating a configurable work factor (also called cost factor or rounds). A work factor of 10 means bcrypt performs 2¹⁰ = 1,024 internal iterations, making each hash computation take ~100ms on typical hardware. An attacker can only attempt ~10 passwords per second — transforming a brute-force attack from minutes to centuries. Increasing the work factor by 1 doubles the computation time, allowing your security to scale with hardware improvements over time.

Generating a Bcrypt Hash

To generate a Bcrypt hash, enter your plaintext password and select a work factor (10–12 is recommended for most applications; lower for high-throughput systems, higher for critical-security scenarios). The tool generates a 60-character hash string in the standard $2b$ format. This string includes the algorithm identifier, the work factor, and the salt — making it entirely self-contained and portable across any Bcrypt-compatible library.

Every time you hash the same password, the output is different because Bcrypt automatically generates a unique random salt for each hash. This by-design behaviour means two identical passwords produce different hashes — preventing attackers from identifying which users share the same password even if the database is compromised.

Verifying a Password Against a Hash

During login, your application must verify that the user's entered password matches the stored hash — but because Bcrypt is intentionally non-reversible, this requires using the Bcrypt comparison function rather than rehashing and comparing strings. Our checker extracts the salt from the stored hash, applies it to the candidate password, and compares the resulting hash to the stored value — the same operation performed by bcrypt.compare() in Node.js, Python's bcrypt.checkpw(), and PHP's password_verify().

Frequently Asked Questions (FAQ)