bcrypt Hash Generator
Generate a salted bcrypt hash with a selectable cost factor. The tool checks bcrypt’s 72-byte input limit and runs locally in your browser.
Generated bcrypt Hash
Privacy Note
bcrypt hashing happens locally inside your browser. Use sample values rather than real account passwords. Production applications should generate and verify password hashes inside their trusted backend.
Generate bcrypt Password Hashes Online
bcrypt is a password-hashing algorithm designed for storing passwords more safely than fast general-purpose hashes. It creates a salted hash and applies a configurable cost factor so each hashing operation requires deliberate computing work.
This bcrypt hash generator runs locally in your browser using bcryptjs. Enter a test password, choose the salt rounds, generate the hash, and copy it into a development or testing workflow.
bcrypt processes at most 72 bytes of input. This tool blocks longer UTF-8 input instead of silently hashing only the first 72 bytes. Use sample values rather than real account passwords.
How to Use the bcrypt Generator
- Enter the password or sample text you want to hash.
- Select the bcrypt cost factor, commonly called salt rounds.
- Click Generate bcrypt Hash.
- Copy the generated hash for development or testing.
bcrypt Cost Factor and Salt Rounds
The cost factor controls how much work bcrypt performs. Increasing it makes each hash slower to calculate, which can make large-scale password guessing more expensive. It also increases the time required by your own application, so the value should be tested on the hardware and environment where authentication will run.
- 8 rounds: Faster output for lightweight local testing.
- 10 rounds: A common comparison point for local development and testing.
- 12 rounds: More computational work and slower generation.
- 14 rounds: Much slower in the browser and useful mainly for performance comparison.
What a bcrypt Hash Contains
A bcrypt hash normally includes the bcrypt version marker, cost factor, salt, and resulting hash data in one string. Because a fresh salt is generated each time, the same password can produce different bcrypt hashes.
$2a$10$exampleSaltAndHashValue
Common Uses
- Creating sample bcrypt hashes for backend development.
- Testing login and password-verification workflows.
- Comparing the performance of different cost factors.
- Preparing test fixtures for authentication systems.
- Learning how salted password hashing works.
bcrypt Compared With Fast Hash Functions
General-purpose hash functions are designed to run quickly. That speed is useful for checksums and integrity checks, but it is not ideal for password storage. bcrypt is intentionally slower and includes a cost setting that can be increased as hardware becomes faster.
Applications should store only the bcrypt hash, not the original password. During login, the entered password is checked against the stored hash using a bcrypt verification function.
Frequently Asked Questions
What is bcrypt?
bcrypt is a password-hashing algorithm that combines salting with a configurable cost factor.
Can bcrypt hashes be decrypted?
No. bcrypt is designed as a one-way password-hashing function. Password verification compares an entered password against the stored hash.
Why does the same password generate different hashes?
bcrypt generates a random salt for each hash. The salt is stored inside the final bcrypt string, allowing verification without storing it separately.
What bcrypt rounds should I choose?
Choose a cost that your application can calculate within an acceptable login time. Test it in the real deployment environment rather than relying on one universal value.
Why is bcrypt limited to 72 bytes?
bcrypt only uses the first 72 bytes of a password. Some Unicode characters use more than one UTF-8 byte, so character count and byte count are not always the same.
Does this tool upload passwords?
No. Hash generation runs in your browser. For safety, use sample passwords rather than real credentials.
Can I use the generated hash in my application?
You can use it for development, testing, fixtures, and compatible bcrypt workflows. Production authentication should generate and verify hashes inside the trusted application environment.