How does hash identification work?

Structured hashes such as bcrypt and Argon2 carry an explicit prefix, so they are matched exactly. Raw hex or Base64 digests have no label, so the tool infers candidates from the length in bits and the character set.

Why does it list several possible algorithms?

Many algorithms produce the same output length. For example a 32-character hex string could be MD5, MD4, NTLM or MD2. Without context the length can only narrow the options, not pick one.

Can it tell bcrypt from a plain SHA hash?

Yes. bcrypt strings start with $2a$, $2b$ or $2y$ followed by a cost and salt, which is unmistakable, whereas a bare SHA-256 digest is just 64 hex characters with no prefix.

Does identifying a hash help me crack it?

No. This tool only classifies the format so you can choose the right verification routine. It does not reverse, crack or look up any hash, and salted or slow hashes like bcrypt are designed to resist cracking entirely.

Is my hash sent anywhere?

No. All matching is done in your browser against built-in length and prefix rules, so the hash never leaves your device.

Hash Identifier — Gera Tools

A hash identifier tells you which algorithm most likely produced a hash string, so you can pick the correct verification routine or debug a password store. Some hashes announce themselves with a prefix; others are anonymous fixed-length digests where only the length narrows the options. This tool handles both, locally.

How it works

There are two distinct cases:

Prefixed / structured formats carry an explicit identifier and are matched first with high confidence. Examples include bcrypt ($2b$...), Argon2 ($argon2id$...), the crypt(3) family ( $1$ md5crypt, $5$ sha256crypt, $6$ sha512crypt, $y$ yescrypt) and LDAP {SSHA}.
Raw digests in hex or Base64 have no label, so candidates are inferred from the length in bits and the character set. For instance 32 hex characters (128 bits) matches MD5, MD4, NTLM and MD2; 64 hex characters (256 bits) matches SHA-256, SHA3-256 and BLAKE2s.

Because algorithms collide on length, the tool returns all plausible candidates for raw digests rather than guessing a single answer.

Notes

A confident, single answer is only possible for prefixed formats. If you paste a bare hex digest, treat the list as a shortlist and use surrounding context (which system produced it, whether it is salted) to decide.
This tool classifies only — it never cracks, reverses or looks up a hash, and slow salted hashes such as bcrypt and Argon2 are built to resist cracking.
All matching runs in your browser, so the hash never leaves your device.