xxHash, MurmurHash3, FNV & SipHash Calculator

Computes the fast, non-cryptographic hashes used in hash tables, Bloom filters, sharding, caches and data-file checksums, all at once and over the exact bytes you give it: UTF-8 text, hex bytes, or a file of up to 4 MB. It covers xxHash32 and xxHash64, MurmurHash3 in its x86_32 and x64_128 variants, FNV-1 and FNV-1a at 32 and 64 bits, and SipHash-2-4 with a 128-bit key. Each value is shown in hex and in decimal; MurmurHash3's 128-bit result is given as its two 64-bit halves and as the 16 bytes the reference C code writes out, and SipHash as its 64-bit value and its little-endian byte form, since libraries disagree on which of these they print. Seeds accept decimal or 0x-hex; xxHash64 uses the full 64-bit seed and the 32-bit functions use its low 32 bits. Every result matches the reference libraries (the xxhash, mmh3 and siphash24 bindings of the original C code) and the published vectors, including the SipHash paper's test vector. None of these is a cryptographic hash: FNV, xxHash and MurmurHash can be forced to collide on purpose, so never use them for passwords, signatures or anything an attacker controls — use SHA-256 or BLAKE2 there. SipHash is the exception meant for hash-flooding protection, but only while its key stays secret. XXH3 and XXH128, the newer xxHash variants, are not included and produce different values from xxHash64.