Hash Identifier

Identify the likely algorithm behind a hash string based on its length and format. Paste a hash to see which common algorithms produce output of that length.

Hash String

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Why use Hash Identifier?

This tool matches a hash string against known length and format patterns for common algorithms — MD5, SHA-1, the SHA-2 and SHA-3 families, bcrypt, Argon2, and Unix crypt formats. Since some algorithms share the same output length, it lists every algorithm consistent with the format rather than claiming a single definitive answer.

Key benefits

Recognizes common algorithms by length and format
Detects prefixed formats like bcrypt and Unix crypt
Instant client-side matching

Features

MD5, SHA-1, SHA-2, SHA-3 family length matching
bcrypt, Argon2, and Unix crypt prefix detection

Popular use cases

Figuring out what hash algorithm produced a value found in a database dump or config file
Verifying a hash matches the expected algorithm format
Learning to recognize common hash formats

How to use Hash Identifier

1
Paste a hash
Enter the hash string you want to identify.
2
Review possible matches
See which known hash algorithms produce output matching that length and format.

Frequently asked questions

Can this tell me exactly which algorithm was used?

Not always — several algorithms (like SHA-256 and SHA3-256) produce the same-length output, so the tool lists all algorithms matching that length rather than guessing a single answer.

Does this crack or reverse the hash?

No. This tool only identifies the likely algorithm format — it does not attempt to reverse or crack the hash.

Is my hash uploaded anywhere?

No. Matching happens entirely in your browser using pattern rules.

Last reviewed: July 2026

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