MAC Address Generator
Generate MAC addresses that are correctly marked as locally administered.
Bcrypt Generator
Hash a password with bcrypt, or check one against an existing hash.
Mode
Quick Tool Overview
The Bcrypt Generator hashes a password at a cost you choose, or checks a password against an existing hash. The implementation is verified against the output of server-side bcrypt, and runs entirely in your browser.
- What it does
- Generates and verifies bcrypt password hashes
- You give it
- A password, and optionally an existing hash
- You get back
- A 60-character bcrypt hash, or a match verdict
- Best for
- Seeding a user, and debugging a failing login
About the Bcrypt Generator
bcrypt is the password hash to use when you have no strong reason to use Argon2. It is deliberately slow, the cost is adjustable so it can be made slower as hardware improves, and it generates and stores its own salt inside the hash — so two identical passwords never collide.
The cost factor is the whole point. It is a power of two, so cost 12 does four times the work of cost 10. Pick the highest value your server can absorb at your login rate; 12 is a reasonable default in 2024 and takes a few hundred milliseconds. The verify mode is just as useful as generating: paste a hash from your database and a candidate password to confirm the two match, which is the quickest way to debug a login that keeps failing.
Key features of the Bcrypt Generator
Verify mode
Paste a hash from your database and a candidate password to see whether they match — usually faster than adding logging to find out why a login fails.
Adjustable cost
Choose the work factor and see how long it actually took, so you can pick the highest value your login endpoint can absorb.
Every prefix
$2y$, $2a$ and $2b$ are all supported and all interchangeable, so a hash from PHP verifies against one from Go or Node.
Honest about the 72-byte limit
bcrypt truncates at 72 bytes — and bytes, not characters — and the tool warns when a password crosses that line.
Nothing is uploaded
The whole algorithm runs in your browser, so a real password is never transmitted.
How to use the Bcrypt Generator
-
1
Choose hash or verify
Hash a new password, or check a password against a hash you already have.
-
2
Set the cost
12 is a sensible default. Higher is slower and stronger; the tool shows how long it took.
-
3
Pick the prefix
$2y$ is what PHP writes, $2a$ and $2b$ are what most other languages produce. They are interchangeable.
-
4
Copy the hash
The 60-character result goes straight into a database column.
Frequently asked questions
The highest your login endpoint can absorb. 12 is a common 2024 default and takes a few hundred milliseconds; 10 is the floor. Measure it on your own hardware rather than guessing.
They mark which implementation wrote the hash after some historical bugs. All three are the same algorithm and verify against each other, so a $2y$ hash from PHP checks fine in a Go or Node library.
Because bcrypt generates a random salt and stores it inside the hash. That is the point — it means two users with the same password get different hashes, so cracking one does not crack the other.
Yes, the input is truncated at 72 bytes, and bytes not characters — so an emoji costs four. If you need long passphrases, pre-hash with SHA-256 before bcrypt, or use Argon2.
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