Hash Generator

Hash Functions Explained: SHA-1 to SHA-512

A cryptographic hash turns any input into a fixed-length fingerprint. The same input always produces the same hash, but even a one-character change produces a completely different result — which makes hashes ideal for integrity checks, deduplication, and password storage.

1. Which Algorithm Should I Use?

• SHA-256: the general-purpose default — used in TLS certificates, Git (SHA-256 mode), and blockchain.
• SHA-512: longer digest, often faster on 64-bit CPUs; good for high-security contexts.
• SHA-1: legacy only. Collisions have been demonstrated — avoid for anything security-sensitive.

2. Hashing Is Not Encryption

Encryption is reversible with a key; hashing is one-way by design. Don't "encrypt" data by hashing it, and don't store passwords with a bare hash either — real systems add salt and use slow KDFs like bcrypt or Argon2.

3. Everyday Uses

Verify a downloaded file against its published checksum, generate cache keys, compare configs without diffing full contents, or create stable identifiers from arbitrary text.