Hash and checksum tools

Hashing turns any input into a fixed-length fingerprint. Cryptographic hashes (SHA, BLAKE, SHA-3) are used for integrity and authentication. Checksums (CRC, Adler-32, XXH) are used for fast error detection.

CRC

CRC-32

Calculate CRC-32 checksums of text.

CRC-32 File

Calculate the CRC-32 checksum of a file. Streams the file in your browser.

CRC-16 Checksum Calculator

Calculate CRC-16 checksums in 8 common variants (ARC, CCITT-FALSE, XMODEM, MODBUS, USB, KERMIT, DNP, MAXIM).

Adler-32

Calculate Adler-32 checksums of text.

Adler-32 File

Calculate the Adler-32 checksum of a file. Streams the file in your browser.

XXHash

XXH32

Calculate XXH32 non-cryptographic hashes with an optional seed.

XXH64

Calculate XXH64 non-cryptographic hashes with an optional 64-bit seed.

XXH3

Calculate XXH3 hashes (64-bit or 128-bit).

XXH128

Calculate XXH128 (128-bit XXH3) non-cryptographic hashes.

MD

MD5

Calculate MD5 hashes or HMAC-MD5 from text.

MD5 File

Calculate the MD5 checksum of a file. Streams the file in your browser.

MD2

Calculate MD2 (RFC 1319) hashes of text. Legacy compatibility only.

MD4

Calculate MD4 (RFC 1320) hashes of text. Legacy compatibility only.

MD2 File

Calculate the MD2 hash of a file. Legacy compatibility only.

MD4 File

Calculate the MD4 hash of a file. Legacy compatibility only.

SHA-1

Calculate SHA-1 hashes or HMAC-SHA-1 from text.

SHA-1 File

Calculate the SHA-1 hash of a file. Streams the file in your browser.

SHA-2

SHA-256

Calculate SHA-256, HMAC-SHA-256, or double SHA-256.

SHA-256 File

Calculate the SHA-256 hash of a file. Streams the file in your browser.

SHA-384

Calculate SHA-384 hashes or HMAC-SHA-384 from text.

SHA-384 File

Calculate the SHA-384 hash of a file. Streams the file in your browser.

SHA-512

Calculate SHA-512 hashes or HMAC-SHA-512 from text.

SHA-512 File

Calculate the SHA-512 hash of a file. Streams the file in your browser.

SHA-512/224

Calculate SHA-512/224 hashes.

SHA-512/256

Calculate SHA-512/256 hashes.

SHA-512/224 File

Calculate the SHA-512/224 hash of a file. Streams the file in your browser.

SHA-512/256 File

Calculate the SHA-512/256 hash of a file. Streams the file in your browser.

SHA-224

Calculate SHA-224 hashes from text.

SHA-224 File

Calculate the SHA-224 hash of a file. Streams the file in your browser.

Double SHA-256

Calculate Double SHA-256 (SHA-256d) hashes. The hash used by Bitcoin.

SM3

Calculate SM3 (GB/T 32905-2016) hashes of any input. Chinese national cryptographic hash standard.

Whirlpool

Calculate Whirlpool (ISO/IEC 10118-3) hashes of any input. 512-bit AES-derived hash.

Double SHA-256 File

Calculate the Double SHA-256 (SHA-256d) hash of a file. The Bitcoin hash.

SHA-3

Calculate SHA-3 (224, 256, 384, 512) hashes from text.

SHA3-224

Calculate SHA3-224 (FIPS 202) hashes of text in your browser.

SHA3-256

Calculate SHA3-256 (FIPS 202) hashes of text in your browser.

SHA3-384

Calculate SHA3-384 (FIPS 202) hashes of text in your browser.

SHA3-512

Calculate SHA3-512 (FIPS 202) hashes of text in your browser.

SHA3-224 File

Calculate the SHA3-224 hash of a file. Streams the file in your browser.

SHA3-256 File

Calculate the SHA3-256 hash of a file. Streams the file in your browser.

SHA3-384 File

Calculate the SHA3-384 hash of a file. Streams the file in your browser.

SHA3-512 File

Calculate the SHA3-512 hash of a file. Streams the file in your browser.

Keccak

Keccak-224

Calculate Keccak-224 hashes (Ethereum-style pre-standard Keccak).

Keccak-256

Calculate Keccak-256 hashes (Ethereum keccak256).

Keccak-384

Calculate Keccak-384 hashes.

Keccak-512

Calculate Keccak-512 hashes.

Keccak-224 File

Calculate the Keccak-224 hash of a file (Ethereum-style pre-standard Keccak). Streams the file.

Keccak-256 File

Calculate the Keccak-256 hash of a file (Ethereum keccak256). Streams the file.

Keccak-384 File

Calculate the Keccak-384 hash of a file. Streams the file in your browser.

Keccak-512 File

Calculate the Keccak-512 hash of a file. Streams the file in your browser.

SHAKE

SHAKE-128

Calculate SHAKE-128 (extendable-output function) at any output length.

SHAKE-256

Calculate SHAKE-256 (extendable-output function) at any output length.

SHAKE128 File

Calculate the SHAKE128 hash of a file at 256-bit output. Streams the file in your browser.

SHAKE256 File

Calculate the SHAKE256 hash of a file at 512-bit output. Streams the file in your browser.

cSHAKE

cSHAKE128

Calculate cSHAKE128 (NIST SP 800-185) at any output length with optional domain separation.

cSHAKE256

Calculate cSHAKE256 (NIST SP 800-185) at any output length with optional domain separation.

cSHAKE128 File

Calculate the cSHAKE128 hash of a file (default parameters).

cSHAKE256 File

Calculate the cSHAKE256 hash of a file (default parameters).

KMAC

KMAC128

Calculate KMAC128 (NIST SP 800-185) message authentication codes.

KMACXOF128

Calculate KMACXOF128 (NIST SP 800-185) message authentication codes at any output length.

KMACXOF256

Calculate KMACXOF256 (NIST SP 800-185) message authentication codes at any output length.

KMAC256

Calculate KMAC256 (NIST SP 800-185) message authentication codes.

KMAC128 File

Calculate the KMAC128 message authentication code of a file.

KMAC256 File

Calculate the KMAC256 message authentication code of a file.

TupleHash

TupleHash128

Calculate TupleHash128 (NIST SP 800-185) of an ordered tuple of byte strings.

TupleHashXOF128

Calculate TupleHashXOF128 (NIST SP 800-185) of an ordered tuple at any output length.

TupleHash256

Calculate TupleHash256 (NIST SP 800-185) of an ordered tuple of byte strings.

TupleHashXOF256

Calculate TupleHashXOF256 (NIST SP 800-185) of an ordered tuple at any output length.

ParallelHash

ParallelHash128

Calculate ParallelHash128 (NIST SP 800-185) tree-based parallel hash.

ParallelHashXOF128

Calculate ParallelHashXOF128 (NIST SP 800-185) tree-based hash at any output length.

ParallelHash256

Calculate ParallelHash256 (NIST SP 800-185) tree-based parallel hash.

ParallelHashXOF256

Calculate ParallelHashXOF256 (NIST SP 800-185) tree-based hash at any output length.

BLAKE

BLAKE2b

Calculate BLAKE2b hashes at 8-512 bit output.

BLAKE2s

Calculate BLAKE2s hashes at 8-256 bit output.

BLAKE3

Calculate BLAKE3 hashes (fast modern cryptographic hash).

BLAKE3 File

Calculate the BLAKE3 hash of a file. Streams the file in your browser.

BLAKE2b File

Calculate the BLAKE2b hash of a file. Streams the file in your browser.

BLAKE2s File

Calculate the BLAKE2s hash of a file. Streams the file in your browser.

RIPEMD

RIPEMD-160

Calculate RIPEMD-160 hashes of text.

RIPEMD-160 File

Calculate the RIPEMD-160 hash of a file. Streams the file in your browser.

RIPEMD-128

Calculate RIPEMD-128 hashes of text in your browser.

RIPEMD-256

Calculate RIPEMD-256 hashes of text in your browser.

RIPEMD-320

Calculate RIPEMD-320 hashes of text in your browser.

RIPEMD-128 File

Calculate the RIPEMD-128 hash of a file.

RIPEMD-256 File

Calculate the RIPEMD-256 hash of a file.

RIPEMD-320 File

Calculate the RIPEMD-320 hash of a file.

HMAC

HMAC Calculator

Compute HMAC with MD5, SHA-1, SHA-256, SHA-384, or SHA-512.

About hash tools

Cryptographic hashes must be collision-resistant and preimage-resistant. Changing one byte of input should change the entire output, and it should be impractical to find two inputs that produce the same hash. SHA-256, SHA-512, and SHA-3 meet these requirements. MD5 and SHA-1 no longer do.

Checksums are faster but weaker. CRC-32 and Adler-32 catch accidental bit flips in files and network packets. XXH3 is a modern non-cryptographic hash used by databases and compression libraries. None of them should be used for security.

Keyed hashes (HMAC) add a secret to a hash, proving both integrity and authenticity. Use them for API signatures, cookies, and message authentication. Password hashing is a different problem entirely, solved with Argon2, scrypt, or bcrypt, which are intentionally slow.