MurmurHash3 Generator

MiniWebtool’s MurmurHash3 Generator calculates non-cryptographic 32-bit and 128-bit hashes for text, or for a batch of files at once. Set a seed and compare decimal, hex, and binary output for testing.

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Help me understand MiniWebtool's MurmurHash3 Generator: https://miniwebtool.com/murmurhash3-generator/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

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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.

At a Glance

MurmurHash3 Generator computes non-cryptographic 32-bit and 128-bit MurmurHash3 hashes of text or imported file contents. You can set the seed and read each hash in decimal, hexadecimal and binary.

MurmurHash3 Generator: features at a glance
Feature	What you get	Good for
32-bit and 128-bit	The 32-bit hash is a single 4-byte integer. The 128-bit hash is four 32-bit integers, 16 bytes in total.	Choosing a hash size for tables or large datasets
Seed value	The seed defaults to 0. The same input and seed always give the same hash, and a different seed gives a different hash.	Building several independent hash functions for a Bloom filter
Three output formats	Each hash is shown in decimal, hexadecimal and binary, with a copy button for each.	Matching the format your code expects
File import	Load the text content of a local file into the input box and hash it.	Hashing a stored string or sample data
Input statistics	Shows live input statistics and byte analysis, plus a visual hash comparison and collision analysis.	Inspecting how input changes affect the hash
Not for security	MurmurHash3 is not cryptographic. The page says not to use it for password hashing or digital signatures.	Hash tables, sharding and deduplication, not security

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:

MurmurHash3 Generator: MurmurHash3 Variants
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

MurmurHash3 Generator: 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 a text file into the box, or choose several files at once to hash each file’s original bytes with the same seed.
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

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Help me understand MiniWebtool's MurmurHash3 Generator: https://miniwebtool.com/murmurhash3-generator/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

MurmurHash3 Generator