MurmurHash

MurmurHash is a non-cryptographic hash designed by Austin Appleby, achieving good distribution and high speed through multiply-and-rotate operations.

Purpose

Provides a low-collision, high-speed non-cryptographic hash for hash tables.

Mechanism

Each 4-byte block is mixed by multiplying by a constant, rotating, and multiplying again. Trailing bytes are handled at the end. A finalizer (fmix32) provides further diffusion. MurmurHash3 supports 32/128-bit output. Non-cryptographic, with known collisions.

Use cases

Hash tables and Bloom filters
Default Rust HashMap hasher
Database internal hashing
Load-balancing sharding

Examples

Input
```
hello
```
Output
```
0x248bfa47
```
MurmurHash3 x86_32

Common errors

Using MurmurHash for persistent keys (unstable across versions): Use a version-pinned hash or a cryptographic hash

Related terms

FNV (Fowler-Noll-Vo) is a simple non-cryptographic hash that computes quickly via XOR and multiplication by a prime, used for hash tables and fingerprinting.

xxHash is an extremely fast non-cryptographic hash designed by Yann Collet, approaching memory bandwidth limits on modern CPUs, used with LZ4/Zstd compression.

CRC32 is a 32-bit cyclic redundancy check based on polynomial division over GF(2), used to detect transmission errors — not a cryptographic hash.

Related tools

Hash Calculator

Compute MD5, SHA-1, SHA-256, or SHA-512 hashes with hex or Base64 output. Free, private, and 100% client-side.

Murmur3 — pure client-side tool. Privacy-first, no server round-trip.

References