SHA-512/256 Hash Generator

Compute SHA-512/256 cryptographic hashes locally in your browser.

Result

Input

Your input never leaves your device; hashing is done locally using the Web Crypto API.

What is SHA-512/256 Hash?

SHA-512/256 is a truncated variant of SHA-512 producing a fixed 256-bit (64-character hex) output. It provides the security of SHA-512 with the output size of SHA-256.

NIST standard — Defined in FIPS 180-4 as part of the SHA-2 family.

64-bit optimized — Uses 64-bit words internally, making it fast on modern 64-bit processors.

Length extension resistant — Unlike SHA-256, it is inherently resistant to length extension attacks.

Same security level as SHA-256 — 256-bit output provides 128-bit collision resistance.

Zero-Server Tool Data Guarantee

All hashing happens locally in your browser using the Web Crypto API. Your input is never sent to any server.

How to Use

Enter Your Text

Type or paste the text you want to hash into the input area.

View the Hash

The SHA-512/256 hash is computed instantly as you type. It is displayed as a 64-character hex string.

Copy the Result

Use the copy button to save the hash to your clipboard.

Common Use Cases

Digital Signatures

Provides a 256-bit hash suitable for digital signature algorithms with strong collision resistance.

Key Derivation

Use as the PRF in PBKDF2 for deriving encryption keys or hashing passwords with proper iteration counts.

High-Security Checksums

Generate a compact 64-character hex fingerprint for files and data with a higher security margin than SHA-256.

Certificate Transparency

Used in certificate transparency logs and other systems requiring collision-resistant hashing with moderate output size.

Implementation Examples

JavaScriptBrowser (Web Crypto API)

async function sha512_256(message) {
    const msgBuffer = new TextEncoder().encode(message);
    const hashBuffer = await crypto.subtle.digest('SHA-512/256', msgBuffer);
    return Array.from(new Uint8Array(hashBuffer))
        .map(b => b.toString(16).padStart(2, '0')).join('');
}

const hash = await sha512_256('hello world');
// 64 hex characters (256 bits)

SHA-256 vs SHA-512/256 vs SHA-512

Property	SHA-256	SHA-512/256	SHA-512
Output size	256-bit (64 hex)	256-bit (64 hex)	512-bit (128 hex)
Security level	128-bit	128-bit	256-bit
Length extension resistant	No	Yes	Yes
Performance (64-bit)	Fast	Often fastest	Often faster
Performance (32-bit)	Faster	Slower	Slower
NIST standard	Yes (FIPS 180-4)	Yes (FIPS 180-4)	Yes (FIPS 180-4)

Production Best Practices & Security

Don't use for passwords — SHA-512/256 is too fast for direct password hashing; use bcrypt, scrypt, or Argon2 instead. Why:Fast hashing allows attackers to compute billions of hashes per second using GPUs, making brute-force and dictionary attacks trivial against unsalted fast hashes.

Use salt for uniqueness — Identical inputs produce identical hashes; always salt before hashing in security contexts. Why:Without a salt, an attacker can precompute a rainbow table for common inputs and look up millions of hashes at once. Salting forces the attacker to recompute for each individual hash.

Good for key derivation — Use as the underlying hash in PBKDF2 with a high iteration count for password storage. Why:PBKDF2 applies SHA-512/256 thousands of times in sequence, slowing down each guess by the iteration factor and making large-scale brute-force attacks computationally expensive.

Resistant to length extension — Unlike SHA-256, SHA-512/256 is safe for use in HMAC without additional precautions. Why:SHA-256's Merkle-Damgård construction allows attackers to append data to a message and compute a valid hash without knowing the secret key. SHA-512/256's truncated output eliminates this attack vector entirely.

Prefer for new systems — If choosing between SHA-256 and SHA-512/256, prefer SHA-512/256 for its length extension resistance. Why:SHA-512/256 provides the same 256-bit security level as SHA-256 but runs faster on 64-bit processors and eliminates the length extension vulnerability, giving you strictly better security with no trade-offs.

Frequently Asked Questions

SHA-512/256 is a cryptographic hash function that produces a fixed 256-bit (64-character hex) output. It is a truncated variant of SHA-512 defined in FIPS 180-4, providing SHA-512's security properties with a shorter output.

Both produce 256-bit output, but SHA-512/256 is based on SHA-512's internal structure using 64-bit words. This makes it faster on 64-bit processors and inherently resistant to length extension attacks, unlike SHA-256.

No. Like all cryptographic hash functions, SHA-512/256 is one-way. You cannot recover the original input from its hash.

SHA-512/256 offers advantages in length extension resistance and performance on 64-bit hardware. SHA-256 is more widely supported in older systems. Both provide equivalent security at 256 bits.

Yes. All hashing happens locally in your browser using the Web Crypto API. Your input is never sent to any server.