xxHash Generator
Compute xxHash32, xxHash64 or XXH3 hashes from any text instantly.
How to use the xxHash Generator
- Type or paste your text in the box.
- Pick the variant — xxHash64 is a good general default, XXH3 is the newer and faster one.
- The hash appears as you type; click Copy to grab it.
About the xxHash Generator
xxHash was created by Yann Collet, who also created the LZ4 and Zstandard compression algorithms — and that lineage explains the design goal. When you are compressing data at gigabytes per second, an ordinary hash becomes the slowest part of the pipeline. xxHash exists to not be that: it is engineered to run close to the speed at which the CPU can pull bytes out of memory in the first place, which in practice makes it several times faster than CRC-32 or MD5 while still passing the standard statistical quality tests for distribution.
There are two generations here. xxHash32 (8 hexadecimal characters) and xxHash64 (16 characters) are the original functions and are stable, portable and very widely implemented — xxHash64 is the sensible default if you need something another library will recognise. XXH3 is the newer redesign and is faster again, with the biggest gains on short inputs, which is precisely where the older versions were weakest and where hash tables spend most of their time. XXH3 comes in a 64-bit form (16 characters) and a 128-bit form (32 characters); take the 128-bit one when you are fingerprinting a very large number of items and want accidental collisions to be effectively impossible.
xxHash is a workhorse for deduplication, cache keys, content fingerprinting, integrity checks inside compressed formats and hash tables — anywhere you are moving a lot of data and the hash must not become the bottleneck. It is emphatically not cryptographic. Speed and attack resistance are opposing goals, and xxHash chose speed: it makes no attempt to stop someone deliberately constructing two inputs with the same hash. Never use it for passwords, signatures or verifying that a download has not been tampered with — for that use SHA-256.
Frequently asked questions
Which xxHash variant should I use?
xxHash64 is the safest general default and the most widely supported. Choose XXH3 if you control both ends and want maximum speed, especially on short inputs, and XXH3-128 when you are fingerprinting huge numbers of items.
How much faster is xxHash than MD5?
Substantially — xxHash is designed to run at close to memory-read speed, while MD5 does far more work per byte. The exact ratio depends on your CPU and input size, but xxHash is in a different performance class entirely.
Is xxHash secure?
No. It is a non-cryptographic hash built purely for speed and good distribution. It must never be used for passwords, digital signatures, or detecting deliberate tampering — collisions can be constructed on purpose.
What is the difference between xxHash64 and XXH3-64?
Both output 16 hex characters, but they are different algorithms and give different results. XXH3 is the newer design and is faster, particularly on small inputs. They are not interchangeable.
Is my text sent anywhere?
Your text is sent to our server to be hashed, because browsers cannot compute xxHash. It is hashed and immediately discarded — never logged, never stored.