SHA Hash Generator
Generate cryptographic SHA hashes from any text input. Supports SHA-1, SHA-256, SHA-384, and SHA-512 using the browser's native Web Crypto API — no external libraries. Output is lowercase hexadecimal. Useful for checksums, integrity verification, content fingerprinting, and learning how hashing works.
How to Generate a SHA Hash
- 1Type or paste the text you want to hash
- 2Select the hash algorithm: SHA-1, SHA-256, SHA-384, or SHA-512
- 3The hash updates automatically as you type
- 4Copy the resulting hex string
Key Benefits
- Supports SHA-1, SHA-256, SHA-384, and SHA-512
- Uses the browser's native Web Crypto API — no external libraries
- Real-time hash output as you type
- Runs entirely client-side — input never leaves your browser
Frequently Asked Questions
What is a SHA hash?
SHA (Secure Hash Algorithm) is a family of cryptographic hash functions that take any input and produce a fixed-size output (the digest). The same input always produces the same hash, but even a one-character change produces a completely different result — this is called the avalanche effect. SHA is one-way: given the hash, there is no algorithm to reconstruct the original input. This makes it ideal for integrity verification and fingerprinting.
Which SHA algorithm should I use?
SHA-256 is the most widely used and recommended for general purposes: file checksums, HMAC signatures, certificate fingerprints, and data integrity. SHA-512 produces a longer digest and is preferred in high-security or high-throughput contexts. SHA-384 is used in specific TLS profiles. SHA-1 is considered cryptographically weak for security applications and should not be used for new work — though it remains in common use for non-security tasks like Git object IDs.
Is SHA hashing the same as encryption?
No — and this distinction matters. Hashing is one-way and irreversible: there is no key and no decrypt operation. Encryption is reversible with the correct key and is used for confidentiality. SHA is used to verify that data has not changed, not to protect it from being read. If you need to keep data secret, use encryption; if you need to verify integrity or create a fingerprint, use hashing.
Can I use SHA for storing passwords?
A plain SHA hash is not suitable for password storage. SHA is designed to be fast, which means an attacker can hash billions of candidate passwords per second and compare them against a stolen hash database. For passwords, use a purpose-built key derivation function like bcrypt, scrypt, or Argon2 — these are intentionally slow, incorporate a per-password salt, and are designed specifically for this use case. SHA is appropriate for file checksums, content fingerprints, and non-password identifiers.
What is a hash collision, and does it matter for SHA-256?
A collision occurs when two different inputs produce the same hash. For SHA-256, no practical collision has been found — the 2^256 output space makes brute-force collision attacks computationally infeasible with current technology. SHA-1 collisions were publicly demonstrated in 2017 (Google's SHAttered attack), which is why SHA-1 is no longer recommended for security-sensitive use. SHA-256 and SHA-512 remain collision-resistant for all known practical purposes.
What are typical real-world uses for SHA hashing?
Verifying file downloads by comparing a published SHA-256 checksum, generating cache-busting fingerprints for static web assets, building HMAC signatures for API request authentication, creating Merkle tree structures in blockchains and distributed version control, generating ETag headers for HTTP caching, and producing deterministic identifiers from content — Git uses SHA-1 for all commit and blob objects, for example. SHA-256 is also the hash function inside most modern TLS certificate signatures.