Hash Identifier
Paste a hash and see which algorithms fit its length or prefix.
A length match is not proof. MD5 and MD4 are the same length. SHA-256 and BLAKE3 are the same length.
How to identify a hash
1. Paste the hash.
2. Read the algorithms that fit.
3. Confirm with the person who created it. Length alone cannot tell SHA-256 from BLAKE3.
What a hash length means
Each algorithm writes a fixed number of hex characters. CRC-32 is 8. MD5 is 32. SHA-1 is 40. SHA-256 is 64. SHA-512 is 128. Several algorithms share a length, so the page lists every common one.
bcrypt and Argon2
Those password hashes start with a prefix such as $2a$ or $argon2id$. The prefix names the algorithm. It does not mean the hash is a checksum of a file.
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