SHA-512 Hash Generator
Generate SHA-512 hash from any text input. 128-character hex digest computed 100% in your browser.
How to use
- 1 Type or paste the text you want to hash into the input field.
- 2 The SHA-512 hash is computed instantly using the Web Crypto API.
- 3 Click Copy to grab the 128-character hex digest.
- 4 SHA-512 produces a stronger hash, ideal for high-security checksums and integrity verification.
- 5 Note: do not use SHA-512 to store passwords. Use a password hashing function like bcrypt, scrypt, or Argon2.
Key features
- Computes SHA-512 hash using the native Web Crypto API
- Produces a 128-character hexadecimal digest
- Stronger than SHA-256, ideal for high-security applications
- No data is sent to any server. All computation is local
What is SHA-512?
SHA-512 is the strongest member of the SHA-2 family standardized by NIST in FIPS 180-4. It produces a 512-bit digest rendered as a 128-character hexadecimal string — twice the length of SHA-256. It was designed alongside SHA-256 but targets modern 64-bit processors, where it often runs faster than SHA-256 because it processes larger message blocks per round.
Security-wise, SHA-512 is considered equivalent to SHA-256 today, but its longer output offers a larger safety margin against future cryptanalytic advances and against partial collision attacks. You will find it in high-assurance environments: firmware signing, government-grade cryptography, and protocols that deliberately choose a wider digest (for example SHA-384, a truncated variant of SHA-512, appears in the TLS 1.2 cipher suites). Like the rest of SHA-2, no practical collision or preimage attack against SHA-512 has been published.
Common Use Cases
Firmware and file integrity
Firmware releases, installers, and large downloads are paired with a SHA-512 checksum to verify the file was not corrupted or tampered with in transit.
Digital signatures
FIPS-compliant signing schemes can pair RSA/ECDSA signatures with SHA-512 to provide the widest standard digest and long-term margin.
HMAC-SHA512 authentication
API request signing, webhook payloads, and message authentication codes use HMAC-SHA512 where the strongest digest is preferred.
High-security applications
Government and defense-grade systems, secure storage, and protocols that explicitly select SHA-512 or its truncation SHA-384.
Backup verification
Compute and compare SHA-512 digests of backups to confirm archives are complete and byte-identical after transfer.
64-bit server workloads
On modern 64-bit CPUs, SHA-512 often outperforms SHA-256, making it a pragmatic choice for server-side hashing at scale.
SHA-512 in the SHA-2 Family
| Variant | Output | Best for |
|---|---|---|
| SHA-224 | 224 bit / 56 hex | Space-constrained environments, truncated HMAC |
| SHA-256 | 256 bit / 64 hex | General purpose: TLS, APIs, blockchain, tokens |
| SHA-384 | 384 bit / 96 hex | TLS 1.2 cipher suites, high-security services |
| SHA-512 | 512 bit / 128 hex | Maximum-security digests, 64-bit performance |
Frequently Asked Questions
Is SHA-512 more secure than SHA-256?
In practice both are considered cryptographically secure today. SHA-512 produces a longer 512-bit digest, which gives a larger theoretical margin against brute-force and future collision attacks, and it resists length-extension attacks on its own (unlike SHA-256, whose truncation SHA-512/256 fixes). On 64-bit hardware, SHA-512 is often faster than SHA-256 because it consumes 128-byte blocks per round instead of 64-byte. Choose SHA-512 when you want the widest digest and your workload runs on 64-bit systems.
How many characters is a SHA-512 hash?
A SHA-512 hash is 512 bits, which is 64 bytes, and is normally displayed as a 128-character hexadecimal string. If you see 64 hex characters, that is SHA-256; 96 characters is SHA-384; 40 is SHA-1; and 32 is MD5.
Can a SHA-512 hash be decrypted?
No. SHA-512 is a one-way hash function: given a digest you cannot recover the original input. The only attacks are brute force and dictionary attacks on the input, which is why hashes are safe for integrity checks but must never be used alone to store passwords — see the next question.
Is SHA-512 safe for storing passwords?
No. SHA-512 is deliberately fast, so an attacker can compute millions of hashes per second and run dictionary or rainbow-table attacks. For passwords use a key-derivation function designed to be slow and to require a salt, such as bcrypt, scrypt, or Argon2. Use the SHA-512 generator for checksums, integrity verification, and HMAC — not for password storage.
What is the difference between SHA-512 and SHA-384?
SHA-384 is a truncated variant of SHA-512: it runs the same algorithm but uses a different initialization vector and outputs only the first 384 bits (96 hex characters). It inherits SHA-512's structure while producing a shorter digest, and it appears in several TLS 1.2 cipher suites. Use SHA-384 when a 96-character digest is acceptable and a TLS cipher suite calls for it; use SHA-512 for the longest standard SHA-2 output.