# Hash Identifier

> Identify which hash algorithm produced a digest by its structure.

URL: https://uttir.com/hash-identifier
Categories: security-tools, developer-tools
Privacy: Identification is pure string analysis in your browser. Your digest never leaves this page.

## About

Hash Identifier tells you which algorithm most likely produced a digest. It analyses the structure — length in hex characters, character set, and known constant prefixes like the famous MD5 digest of an empty string — and ranks the plausible algorithms.

Length is strong evidence: 32 hex characters means a 128-bit digest (MD5 or NTLM), 64 means 256-bit (SHA-256 family), 128 means SHA-512 or BLAKE2b. For the four algorithms Uttir can compute locally, you can hash a known text and compare digests to confirm the guess.

## How to use

1. **Paste the digest** — Whitespace, colons, and a 0x prefix are tolerated.
2. **Read the candidates** — Matches are ranked by length evidence.
3. **Confirm by comparison** — Hash a known input locally and compare digests when possible.

## Examples

### A 32-character digest

d41d8cd98f00b204e9800998ecf8427e is 32 hex chars and matches the known MD5 digest of an empty string — identified as MD5.

Input:

```
d41d8cd98f00b204e9800998ecf8427e
```

Output:

```
MD5 (length match + empty-input constant match)
```

## FAQ

### Can identification ever be certain from structure alone?

No. MD5 and NTLM both produce 32 hex characters, and SHA-256, BLAKE2s, and BLAKE3 all produce 64. Structure narrows the field; hashing a known input and comparing digests confirms it.

### Does this crack or reverse hashes?

No — and no honest tool does. Hashes are one-way. This identifies the algorithm so you can verify or migrate credentials properly.

### Which formats are accepted?

Hexadecimal digests with optional whitespace, colons, or a 0x prefix. Base64-encoded digests are detected and noted as such.

### Is anything I paste uploaded?

No. The analysis is pure string processing in JavaScript — the digest never leaves your browser.

## Related tools

- [Hash Generator](https://uttir.com/hash-generator) — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text instantly.
- [Password Strength Checker](https://uttir.com/password-strength-checker) — See how strong a password really is — entropy, time-to-crack, and a list of issues, all computed in your browser.
- [AES Encrypt / Decrypt](https://uttir.com/aes-encrypt) — Encrypt or decrypt text with a password using AES-256-GCM. The encryption runs entirely in your browser, the password never leaves the page, and the result is a portable text envelope you can paste into an email, a chat, or a file.

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For the full HTML page with the live tool, visit https://uttir.com/hash-identifier.
This file is the markdown rendering at https://uttir.com/hash-identifier.md. See https://uttir.com/llms.txt for a site-wide summary.