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SHA-512 Hash Generator

Type or paste text to see its SHA-512 hash instantly, or drop files to get their checksums. Switch to SHA-384, choose hex or Base64, add a key for HMAC, copy a ready-made Subresource Integrity value, and verify against a pasted hash. Nothing leaves your browser.

Last updated: October 24, 2026

Algorithm Output Uppercase

HMAC with a secret key

Text to hash

0 characters · 0 bytes Hash each line separately

Compare with an expected hash

How to use the SHA-512 Hash Generator

Choose Text or Files. Type or paste text, or drop one or more files onto the box.
Pick the algorithm: SHA-512 (128 hex characters) or SHA-384 (96 hex characters).
Choose the output: hex, optionally uppercase, or Base64. The SRI line shows the value for an integrity attribute.
Optional: tick HMAC and enter a secret key to create a keyed signature.
Paste an expected hash into the compare box to check a download, then copy or download the result.

SHA-512 and SHA-384 test vectors

Values from FIPS 180-4 examples and RFC 4231 style references, for checking an implementation. Type the input above without the quotes.

Input	Hash
SHA-512 of "" (empty)	`cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e`
SHA-512 of "abc"	`ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f`
SHA-384 of "" (empty)	`38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b`
SHA-384 of "abc" as SRI	`sha384-ywB1P0WjXou1oD1pmsZQBycsMqsO3tFjGotgWkP/W+2AhgcroefMI1i67KE0yCWn`
HMAC-SHA512, key "key", "The quick brown fox jumps over the lazy dog"	`b42af09057bac1e2d41708e48a902e09b5ff7f12ab428a4fe86653c73dd248fb82f948a549f7b791a5b41915ee4d1ec3935357e4e2317250d0372afa2ebeeb3a`

SHA-2 output sizes

Algorithm	Block size	Rounds	Output	Hex length	Base64 length
SHA-256	512 bits	64	256 bits	64	44
SHA-384	1024 bits	80	384 bits	96	64
SHA-512	1024 bits	80	512 bits	128	88

SHA-512 on the command line

Task	Command
Hash a file (Linux)	`sha512sum file.iso` · `sha384sum file.iso`
Hash a file (macOS)	`shasum -a 512 file.iso`
Hash a file (Windows PowerShell)	`Get-FileHash file.iso -Algorithm SHA512`
Hash text without a newline	`printf '%s' 'abc' \| sha512sum`
SRI value for a script	`openssl dgst -sha384 -binary app.js \| openssl base64 -A`
HMAC with OpenSSL	`printf '%s' 'message' \| openssl dgst -sha512 -hmac 'key'`
Check a list of checksums	`sha512sum -c checksums.sha512`

Frequently asked questions

What is SHA-512?

SHA-512 is a member of the SHA-2 family defined in FIPS 180-4. It processes data in 1024-bit blocks using 64-bit words over 80 rounds and outputs a 512-bit hash, written as 128 hexadecimal characters or 88 Base64 characters. For example, the SHA-512 of "abc" begins ddaf35a193617aba.

What is the difference between SHA-384 and SHA-512?

SHA-384 runs the same algorithm as SHA-512 but starts from different initial values and keeps only the first 384 bits of the result. That gives a 96-character hex hash. Because the output is truncated, SHA-384 is also resistant to length-extension attacks, and it is the most common choice for Subresource Integrity hashes.

Is SHA-512 more secure than SHA-256?

Both are considered secure, with no practical collision or preimage attacks known. SHA-512 has a larger output and security margin and is often faster than SHA-256 on 64-bit CPUs without SHA hardware instructions. For storing passwords neither is suitable on its own; use bcrypt, scrypt or Argon2.

How do I create a Subresource Integrity (SRI) hash?

An SRI value is the algorithm name, a dash and the Base64 hash of the exact file bytes, for example integrity="sha384-…". Open the Files tab, drop the script or stylesheet, and copy the SRI line. On the command line: openssl dgst -sha384 -binary file.js | openssl base64 -A.

Why does my SHA-512 differ from another tool?

Every byte counts. This tool hashes text exactly as typed, encoded as UTF-8. A trailing newline from echo, CRLF line endings or extra spaces produce a completely different hash. Use printf '%s' 'text' | sha512sum to hash text without a newline.

How do I check a SHA-512 checksum on my computer?

On Linux run sha512sum file, on macOS run shasum -a 512 file, and in Windows PowerShell run Get-FileHash file -Algorithm SHA512. For SHA-384 use sha384sum, shasum -a 384 or -Algorithm SHA384.

Are all the tools on FreeToolCabin tested for quality and accuracy?

Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

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