MurmurHash3 Generator

Generate MurmurHash3 hash values for any text. Get 32-bit and 128-bit hashes in decimal, hexadecimal, and binary formats with customizable seed values.

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About MurmurHash3 Generator

The MurmurHash3 Generator creates fast, high-quality hash values using the MurmurHash3 algorithm. This non-cryptographic hash function is optimized for speed and excellent distribution, making it ideal for hash tables, bloom filters, data partitioning, and other applications where fast hashing is essential.

What is MurmurHash3?

MurmurHash3 is a non-cryptographic hash function created by Austin Appleby in 2008, with the final version (MurmurHash3) released in 2011. The name "Murmur" comes from the multiplication and rotation operations used in its implementation. It is designed to provide excellent speed and distribution quality while being simple to implement.

MurmurHash3 processes data in blocks and uses a combination of multiplication, bitwise rotation, and XOR operations to generate hash values. This design achieves an excellent "avalanche effect" where small changes in input produce dramatically different outputs.

Blazing Fast

Optimized for modern CPUs with excellent throughput, processing data at speeds exceeding 2 GB/s on typical hardware.

Consistent Results

Deterministic output: same input and seed always produces identical hash values across platforms.

Excellent Distribution

Near-perfect uniform distribution of hash values minimizes collisions in hash tables.

Customizable Seed

Use different seed values to create multiple independent hash functions from a single algorithm.

MurmurHash3 Variants

MurmurHash3 comes in three official variants optimized for different use cases:

Variant	Output Size	Best For	Notes
MurmurHash3_x86_32	32-bit	Hash tables, general use	Fast on all platforms
MurmurHash3_x86_128	128-bit	Large datasets, lower collision	Optimized for 32-bit CPUs
MurmurHash3_x64_128	128-bit	Large datasets on 64-bit systems	Fastest on 64-bit CPUs

Common Use Cases

🗂️

Hash Tables

🌸

Bloom Filters

🔀

Data Sharding

📋

Deduplication

⚖️

Load Balancing

🔍

Checksums

Hash Table Implementation

MurmurHash3's excellent distribution makes it ideal for hash table implementations. Its speed allows fast insertions and lookups while minimizing clustering and collision chains that degrade performance.

Bloom Filters

Bloom filters use multiple hash functions to test set membership probabilistically. MurmurHash3 with different seeds provides an efficient way to generate multiple independent hash functions from a single algorithm.

Distributed Systems

In distributed databases and storage systems, MurmurHash3 is commonly used for consistent hashing to distribute data across nodes. Its deterministic output ensures the same key always routes to the same server.

Security Warning

MurmurHash3 is NOT suitable for cryptographic purposes. Do not use it for password hashing, digital signatures, or security-critical applications. For those use cases, choose SHA-256, SHA-3, bcrypt, or Argon2.

Understanding Seed Values

The seed value initializes the hash computation and allows you to create multiple independent hash functions. Key points about seeds:

Default seed (0): Produces standard hash values, suitable for most applications
Different seeds: Same input with different seeds produces completely different hashes
Consistency: Same input + same seed always equals same hash output
Independence: Useful for bloom filters requiring multiple hash functions

MurmurHash3 vs Other Hash Functions

Hash Function	Speed	Cryptographic	Best Use Case
MurmurHash3	Very Fast	No	Hash tables, data structures
xxHash	Extremely Fast	No	High-speed checksums
CityHash	Very Fast	No	String hashing
SHA-256	Moderate	Yes	Security, integrity
MD5	Fast	Broken	Legacy checksums only
CRC32	Fast	No	Error detection

How to Use This Tool

Enter your text: Type or paste the text you want to hash into the input field. You can also click an example button to try sample inputs.
Import from file (optional): Click "Import File" to load text content from a local file for hashing.
Set seed value: Enter a seed value if needed (default is 0). Different seeds produce different hash values.
Generate hash: Click the "Generate MurmurHash3" button to compute the hash.
Copy results: Use the copy buttons to copy hash values in your preferred format.

Frequently Asked Questions

What is MurmurHash3?

MurmurHash3 is a non-cryptographic hash function created by Austin Appleby in 2008. It is optimized for speed and provides excellent distribution of hash values, making it ideal for hash tables, bloom filters, and data deduplication. Unlike cryptographic hashes like SHA-256, MurmurHash3 is designed for performance rather than security.

What is the difference between MurmurHash3 32-bit and 128-bit?

MurmurHash3 comes in two main variants: 32-bit produces a single 32-bit integer hash (4 bytes), suitable for hash tables and applications where a smaller hash is sufficient. The 128-bit variant produces four 32-bit integers (16 bytes total), providing better collision resistance for large datasets. The 128-bit version also has optimized implementations for x86 and x64 architectures.

What is a seed value in MurmurHash3?

A seed value is an initial number used to start the hash computation. Different seed values produce completely different hash outputs for the same input string. Seeds are useful for creating multiple independent hash functions, implementing techniques like hash tables with different collision patterns, or adding an extra layer of unpredictability to hash outputs.

Is MurmurHash3 suitable for password hashing?

No, MurmurHash3 should NOT be used for password hashing or any security-critical applications. It is a non-cryptographic hash function designed for speed, not security. For passwords, use dedicated password hashing functions like bcrypt, Argon2, or PBKDF2. For cryptographic integrity verification, use SHA-256 or SHA-3.

What are common use cases for MurmurHash3?

MurmurHash3 is widely used for: hash table implementations, bloom filters for probabilistic data structures, data partitioning and sharding in distributed systems, content-addressable storage, deduplication systems, consistent hashing for load balancing, and generating unique identifiers for non-security purposes.

How does MurmurHash3 compare to other hash functions?

MurmurHash3 offers excellent speed and distribution quality. Compared to MD5/SHA: MurmurHash3 is much faster but not cryptographically secure. Compared to CRC32: MurmurHash3 has better avalanche properties and distribution. Compared to FNV: MurmurHash3 generally provides better performance on modern CPUs. For new projects, xxHash or CityHash may offer even faster performance while MurmurHash3 remains a solid, well-tested choice.

References

Reference this content, page, or tool as:

"MurmurHash3 Generator" at https://MiniWebtool.com/murmurhash3-generator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Jan 25, 2026

Developer API available: Run this tool from your app, automation, or agent with one JSON HTTP request. View API docs

MurmurHash3 Generator