About the SHA-512 Hash Generator
What is a SHA-512 hash?
SHA-512 is the largest common member of the SHA-2 family, producing a 512-bit fingerprint written as 128 hexadecimal characters. It uses 64-bit operations internally, which makes it very fast on modern 64-bit hardware, often faster than SHA-256.
SHA-512 is chosen when you want the biggest standard SHA-2 digest and maximum security margin, and it is widely supported. On Linux systems it also underpins the $6$ crypt password scheme (through many iterations of salted hashing, not a single pass). This tool computes a plain SHA-512 with the browser's native Web Crypto API, locally and privately.
How to Use This Tool
- Enter your input. Type or paste text on the Text tab, or switch to the File tab and drop in a file. The SHA-512 hash appears instantly.
- Choose the output. Switch between hexadecimal and Base64, and pick upper or lowercase hex.
- Verify a checksum. Paste a hash you were given into the compare box and the tool tells you instantly whether it matches.
- Copy the result. One click copies the SHA-512 hash to your clipboard.
Common Use Cases
- Strong integrity checks: the largest standard SHA-2 digest for verifying files and messages.
- 64-bit performance: often faster than SHA-256 on modern processors while offering a bigger margin.
- Certificates and signatures: used where a 512-bit digest is specified.
- HMAC-SHA512 signatures: keyed authentication with a 512-bit tag; enable HMAC mode and enter the key.
Frequently Asked Questions
Is SHA-512 more secure than SHA-256?
It has a larger digest and security margin, and it is often faster on 64-bit hardware, so it is a great choice. That said, SHA-256 is already secure for the foreseeable future, so the practical difference for most uses is small. Pick SHA-512 when you want the extra margin or when a spec requires it.
How long is a SHA-512 hash?
SHA-512 is 512 bits, written as 128 hexadecimal characters or 88 characters in Base64. The length is the same for every input.
Is SHA-512 good for storing passwords?
Not on its own. Raw SHA-512 is fast, which helps attackers, so passwords should use a purpose-built, deliberately slow hash such as bcrypt, scrypt or Argon2. Linux's $6$ scheme does use SHA-512 but wraps it in thousands of salted iterations, which is a different thing from a single SHA-512.
What is HMAC-SHA512?
HMAC-SHA512 combines SHA-512 with a secret key to create a keyed hash for authentication, used by some APIs and token schemes. Turn on HMAC mode above and provide the key.
Can SHA-512 be reversed?
No. It is a one-way function; the input cannot be recovered from the digest faster than brute force, which is infeasible for anything with real entropy.
Can I hash a file with SHA-512?
Yes. Use the File tab to hash any file locally in your browser, producing the same result as sha512sum.