How this calculator works
Check structured prefixes first, then compare a raw hexadecimal digest length with common output sizes. Many algorithms share a length and any arbitrary string can imitate a format. This is an inspection aid, not cryptographic proof or a password recovery tool. Encoded password hashes include parameters and salts, so their total character count is not their digest bit length.
Formula
For an even-length hexadecimal digest, represented bits = 4 x hexadecimal digit count. Prefixes such as $2b$ identify an encoding convention, subject to syntax checks.
Worked example
A 32-digit hexadecimal value is 128 bits and could be MD5, MD4, NTLM or another construction. A 64-digit hexadecimal value could be SHA-256, SHA3-256 or BLAKE2s-256.
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Frequently asked questions
Can a digest reveal the exact algorithm?
Usually not. Context, an algorithm label or a documented storage format is needed.
Does the tool crack passwords?
No. It only inspects the supplied string and lists candidate formats.
What does zero digest bits mean?
The input is not a raw even-length hex digest. It does not mean the underlying algorithm has no security strength.