Hash Identifier Tool
Detect likely MD5, SHA, bcrypt, Argon2, CRC32, and checksum formats from a pasted digest.
Analyze hash length, alphabet, prefixes, and encoded password-hash fields. Verify plaintext candidates by generating common hashes locally in your browser.
How Hash Identification Works
A hash identifier checks character count, alphabet, prefixes, separators, and modular crypt fields. These clues often narrow the candidate list quickly.
If you know a possible plaintext, hash it with candidate algorithms and compare exact outputs. This proves a match for that input and algorithm.
Format alone cannot separate every algorithm. SHA-256 and SHA3-256 can both appear as 64 hexadecimal characters.
| Format | Typical Algorithm | Security Note |
|---|---|---|
| 32 hex chars | MD5 | Legacy checksum only; collision-broken. |
| 40 hex chars | SHA-1 or RIPEMD-160 | Ambiguous by length; SHA-1 is collision-broken. |
| 64 hex chars | SHA-256 or SHA3-256 | Common modern 256-bit digest shape. |
| $2b$... | bcrypt | Password hash with salt and work factor. |
| $argon2id$... | Argon2id | Memory-hard password hash format. |
A hash function is a deterministic algorithm that maps input data to a fixed-size digest.
A checksum is a compact error-detection value used to catch accidental data corruption.
A password hash is a salted, deliberately expensive hash format designed to slow password guessing.
History and Use Cases
Early internet systems used MD4, MD5, and SHA-1 for compact message fingerprints. Collision research later showed MD5 and SHA-1 were unsafe for digital signatures and certificates.
Modern systems typically use SHA-2 or SHA-3 for general-purpose integrity, while passwords should use slow, salted schemes such as bcrypt or Argon2.
- Identify an unknown digest found in logs, databases, or challenge material.
- Check whether a downloaded checksum looks like MD5, SHA-1, SHA-256, or SHA-512.
- Distinguish fast checksums from password-hash formats with salts and parameters.
- Verify an exact plaintext candidate against common digest algorithms.
Hash Identifier FAQ
Why Use This Hash Identifier?
Private
Identification and verification run in your browser. Inputs are not sent to a server.
Fast
Get instant candidates from format checks and generate common digests as you type.
Actionable
Use confidence labels and security notes to choose the next verification step.