SHA-512 Hash Generator
SHA-512 Hash Generator — Free Online Tool
Generate a 512-bit SHA-2 digest - faster than SHA-256 on 64-bit hardware, and the basis of sha512-crypt. Enter your text below and press SHA-512.
SHA-512 Hash Generator
Generate a 512-bit SHA-2 digest - faster than SHA-256 on 64-bit hardware, and the basis of sha512-crypt.
What SHA-512 Is
SHA-512 is SHA-256's larger sibling: same family, same structure, but built on 64-bit words and 1024-bit blocks, producing a 512-bit digest written as 128 hexadecimal characters. The word size is the interesting part - on a 64-bit CPU, SHA-512 typically hashes long inputs faster than SHA-256 despite doing twice the work per digest.
| Algorithm | SHA-512 (SHA-2 family) |
|---|---|
| Digest length | 512 bits — 128 hexadecimal characters |
| Block size | 1024 bits |
| Designed by | the NSA, published by NIST, 2001 |
| Specification | FIPS 180-4 |
| Status in 2026 | Secure |
A worked example
Hashing the five characters hello with SHA-512 gives:
Change a single character of the input and the entire digest changes, with no resemblance to the previous one. That property is called the avalanche effect, and every cryptographic hash is designed to have it.
How SHA-512 Got Here
SHA-512 was published alongside SHA-256 in 2001 as part of FIPS 180-2. Its most visible deployment is not on the web but in operating systems: the sha512-crypt scheme, identified by a $6$ prefix in /etc/shadow, has been the default password hash on most Linux distributions since around 2008, applying SHA-512 with a salt and thousands of rounds. SHA-512/256 - SHA-512 truncated to 256 bits with a different initial state - was later standardised to give 64-bit machines a fast 256-bit digest that is also immune to length extension.
Security Status of SHA-512
No practical attack is known against full SHA-512. Because the digest is twice the size of SHA-256, its collision resistance margin is far larger, which is why it is sometimes preferred for long-lived signatures and archival integrity. It shares the Merkle-Damgard length-extension property, so keyed use should go through HMAC.
Use SHA-512 for
- Long-lived digital signatures and archival integrity, where the larger margin is worth the longer digest.
- Password hashing when it is used through sha512-crypt with a high round count, as Linux does - not as a bare hash.
- HMAC-SHA512 for message authentication.
- Hashing large files on 64-bit servers, where it is often the fastest SHA-2 option.
Do not use SHA-512 for
- Raw, unsalted password storage - a bare SHA-512 is as fast to attack as any other fast hash.
- Contexts with a fixed 32-character field: at 128 hex characters, SHA-512 digests are long, and truncating one yourself is a mistake. Use SHA-512/256 if you need a short digest from the 64-bit variant.
How to Use This SHA-512 Generator
- Paste or type your text into the input box above, or upload a plain-text file.
- Press the SHA-512 button.
- The digest appears in the output box, ready to copy.
The same input always produces the same output@if($algo['status'] === 'password') — except with bcrypt, where the random salt makes every result different@endif, on this page or in any correct implementation. If a digest from another tool disagrees with this one, the cause is almost always a difference in the input: a trailing newline, a different character encoding, or invisible whitespace.
Frequently Asked Questions About SHA-512
Is SHA-512 more secure than SHA-256?
It has a larger security margin because the digest is twice as long, so brute-force collision search is astronomically harder. In practice both are unbroken and both are considered secure, so the choice is usually driven by digest length, platform performance and what the protocol you are implementing requires.
Why can SHA-512 be faster than SHA-256?
SHA-512 works on 64-bit words and processes 1024-bit blocks, while SHA-256 works on 32-bit words and 512-bit blocks. On a 64-bit CPU the wider operations are native, so SHA-512 moves twice as much data per round with no extra cost - which frequently makes it faster per byte on long inputs.
What is the $6$ in a Linux password file?
It identifies sha512-crypt. The field that follows is the salt, then the digest. Despite the name, it is not a bare SHA-512: it applies the hash over thousands of rounds with the salt mixed in, which is what makes it usable for passwords.
How long is a SHA-512 hash?
512 bits, written as 128 hexadecimal characters. It is the longest digest offered by this tool alongside Whirlpool.
Hashing in One Minute
A hash function takes input of any length and returns a fixed-length digest. Three properties define a cryptographic hash: the same input always yields the same digest, it is infeasible to recover the input from the digest, and it is infeasible to find two inputs that produce the same digest. Hashing is one-way and keyless, which is what separates it from encryption — there is nothing to decrypt, because nothing was encrypted.
Where hashes go wrong is almost always a mismatch between the job and the tool. A checksum for detecting a corrupted download and a password hash protecting a leaked database are different problems, and an algorithm that is excellent at one can be disqualifying at the other. For the full treatment — how the algorithms work internally, salting, HMAC, rainbow tables and the rest — see the complete guide to hash generation.
The Other Algorithms in This Tool
The generator above supports every algorithm below. Each has its own page explaining what it is for.