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BCrypt Hash Generator

Use this free BCrypt Hash Generator to create a salted password hash with a configurable cost and copy it for secure password-storage testing.

Generate a salted BCrypt hash Choose a cost from 4 to 15 Create a different valid hash on every run Explain verification with password_verify
BCrypt creates a new salted hash on every run. Use password_verify to check a password against it.
INPUT Password or text to hash *
0 chars0 words0 lines
Paste the source value for this specific transformation. Example: Example password for local testing
BCrypt hash Salted password hash ready to store.
About the tool

What BCrypt Hash Generator does

BCrypt Hash Generator creates salted BCrypt password hashes using a configurable work factor. It is intended for developers, QA engineers, administrators, and students testing password-storage workflows.

Unlike a general checksum, BCrypt is deliberately slow and includes a random salt in the generated string. The same password therefore produces a different valid hash on each run. Verification does not regenerate an identical string; it checks the password against the stored hash.

BCrypt Hash Generator workflow
Choose a cost, generate a salted hash, and retain the complete result.

How to use

  1. Enter a test password. Avoid real production credentials.
  2. Select a cost. Cost 12 is a practical default for many test environments, while the correct production value depends on server performance.
  3. Generate the hash. BCrypt creates a random salt and embeds it in the result.
  4. Copy the complete string. Do not remove the prefix, cost, salt, or hash characters.
  5. Verify correctly. Use password_verify or an equivalent BCrypt implementation.
Built for the task

Why use BCrypt Hash Generator?

Focused controls, predictable output, and a workflow designed around this exact transformation.

01

Salted by design

Every generated hash includes a fresh random salt.

02

Configurable cost

Adjust the work factor from 4 to 15 for development and performance testing.

03

Self-contained result

The algorithm version, cost, salt, and checksum are stored in one string.

04

Password-focused guidance

Learn why verification differs from comparing two generated strings.

Useful answers

Questions about BCrypt Hash Generator

Practical details about input, output, privacy, limits, and the best way to use this tool.

Answer 01

Why does the same password create a different BCrypt hash?

BCrypt generates a new random salt each time. The salt is stored inside the hash string, so different results can all verify the same password.

Answer 01

Why does the same password create a different BCrypt hash?

BCrypt generates a new random salt each time. The salt is stored inside the hash string, so different results can all verify the same password.

How the BCrypt Hash Generator works

BCrypt is a password-hashing function based on the Blowfish key schedule. It combines the password with a random salt and repeats an expensive setup operation according to the selected cost. The returned string contains everything needed for later verification except the original password.

A typical encoded result includes a version marker, a two-digit cost, and encoded salt and checksum data. Preserve the complete string exactly as returned. Truncating or reformatting it will prevent verification.

Why output changes every time

Random salting ensures that identical passwords do not produce identical stored strings. This reduces the usefulness of precomputed lookup tables and prevents an attacker from immediately seeing which accounts share the same password.

Choosing a BCrypt cost

The cost is logarithmic. Increasing it by one approximately doubles the work required for hashing and verification. A value that is comfortable on a development laptop may behave differently on a busy production server, so benchmark realistic login traffic.

Do not select the maximum value automatically. Excessive cost can create availability problems, while a cost that is too low weakens resistance to offline guessing. Record the chosen value, measure latency, and review it as hardware changes.

Rehashing over time

Applications can inspect a stored hash and determine whether it should be replaced with a newer cost or algorithm after a successful login. In PHP, password_needs_rehash supports this migration pattern.

Correct BCrypt verification

Never verify a password by generating a fresh BCrypt hash and comparing strings. A fresh random salt makes the strings different. Instead, pass the candidate password and stored hash to password_verify or an equivalent library function.

The verification function reads the version, cost, and salt from the stored string, repeats the calculation, and compares the result using the implementation’s safe comparison logic.

Common BCrypt mistakes

Storing only part of the hash

Database columns must be wide enough for the complete encoded string. Store it as text without trimming characters.

Using a global manual salt

BCrypt already generates and stores a random salt. Do not replace the library mechanism with one shared application salt.

Comparing generated strings

Two hashes for the same password normally differ. Use a verification function rather than direct equality.

Ignoring the input byte limit

Many BCrypt implementations consider only the first 72 bytes. Unicode passwords may reach that limit with fewer visible characters. Document the behavior or choose a modern password-hashing function with requirements that fit your application.

Security guidance

Use established password APIs, secure random sources, rate limiting, multi-factor authentication where appropriate, and transport encryption. Hashing is only one part of account security.

Argon2id is often preferred for new systems when supported, while BCrypt remains widely deployed and well understood. Follow current platform guidance and regulatory requirements.

Use this online generator only with non-sensitive test data. Production passwords should be hashed inside the trusted application environment and never logged or transmitted to unrelated tools.

BCrypt deployment checklist

Confirm that the database stores the complete string, verification uses a BCrypt-aware function, cost is benchmarked on production-like hardware, login endpoints are rate-limited, password resets invalidate old credentials, and rehashing is supported when parameters change.

Why use this BCrypt Hash Generator?

This BCrypt Hash Generator creates a salted password hash for safe development tests. The BCrypt Hash Generator keeps the complete encoded result visible, including the algorithm marker, cost, salt, and checksum. Use the BCrypt Hash Generator with test passwords only, then verify the stored string with a BCrypt-aware library function.

For implementation details, review the PHP password_hash documentation. This external reference explains the standard password API used by PHP applications.

Related tools

Use the Hash Generator for deterministic MD5, SHA-1, SHA-256, or SHA-512 checksums. Those fast hashes are not substitutes for BCrypt password storage.