SHA-512/256 Hash Generator
Generate the SHA-512/256 hash of any text instantly in your browser. UTF-8, hex or Base64 input; hex or Base64 output. Free, private, no upload.
Runs entirely in your browser. Your data is never uploaded.
What is SHA-512/256 Hash Generator?
SHA-512/256 is a SHA-2 variant that gives a 256-bit digest using the faster-on-64-bit SHA-512 engine with its own initial value. This tool computes the 256-bit SHA-512/256 digest of text or raw bytes (hex or Base64) as you type and shows it as 64 hex characters or Base64.
How to use SHA-512/256 Hash Generator
- Type or paste your input into Text to hash — the digest updates as you type (an empty box shows the hash of empty input).
- Choose the Input encoding: Text (UTF-8) hashes the characters as UTF-8, Hex bytes or Base64 hash the decoded raw bytes.
- Pick the Output format (hex lowercase, hex uppercase or Base64) and click Copy.
Example
abc
53048e2681941ef99b2e29b76b4c7dabe4c2d0c634fc6d46e0e2f13107e7af23
SHA-512/256 of the 3 ASCII bytes "abc" (UTF-8, hex lowercase output), the standard test vector.
When to use SHA-512/256 Hash Generator
Use the SHA-512/256 text tool to hash strings: reproduce a value from documentation or code, build test vectors, compare an API signature input, or check what a program should output. Do not use it to check a downloaded file: copying file contents into a text box changes line endings and encoding, so use the SHA-512/256 file checksum tool. Its output length equals SHA-256 but the values are different, so both sides must agree on the exact algorithm.
How SHA-512/256 Hash Generator works
SHA-512/256 runs the SHA-512 compression function (1024-bit blocks, 80 rounds on 64-bit words) from an initial value generated by the FIPS 180-4 IV generation function — SHA-512 of the ASCII string SHA-512/256 under a modified IV — and keeps the first 256 bits. Truncation also makes it resistant to length-extension attacks, unlike SHA-256. The text is first converted to bytes (UTF-8 by default), so the same characters always give the same hash.
Common Use Cases
- Check the expected SHA-512/256 of a string in a unit test or fixture
- Hash hex bytes copied from a debugger, packet capture or protocol spec
- Compare SHA-512/256 output between two programming languages that disagree
- Generate deterministic identifiers or cache keys from text
- Get the Base64 form of a SHA-512/256 digest for headers or configuration files
Security Note
SHA-512/256 has no known practical attacks. Plain hashes are also not suitable for storing passwords: use a slow, salted password hash such as Argon2, scrypt or bcrypt. Everything is computed locally in your browser; nothing you type is sent anywhere.
FAQs
Why use SHA-512/256 instead of SHA-256?
It is typically faster on 64-bit processors and, being truncated, is not vulnerable to length-extension attacks. It is used for example by Algorand and in some file-integrity and key-derivation designs.
Does SHA-512/256 equal the first half of SHA-512?
No. It has its own initial value; for abc SHA-512/256 is 53048e26… whereas SHA-512 starts with ddaf35a1….
Why does the hash change completely when I change one character?
That is the avalanche effect every cryptographic hash is designed for: flipping one input bit changes about half of the 256 output bits, so similar inputs give unrelated digests.
Does a trailing space or newline matter?
Yes. The hash covers every byte, so abc and abc followed by a newline give different SHA-512/256 values. Make sure the input contains exactly the bytes you intend to hash.