JOAAT Hash Generator
Turn any text into its 8-character Jenkins one-at-a-time hash.
How to use the JOAAT Hash Generator
- Type or paste your text in the box.
- The JOAAT hash appears as you type.
- Click Copy to grab the result.
About the JOAAT Hash Generator
JOAAT stands for Jenkins one-at-a-time, a small non-cryptographic hash designed by Bob Jenkins and one of the classic hash-table hashes. The name describes how it works: it consumes the input a single byte at a time, mixing each one into a running 32-bit value with adds and bit shifts, then finishes with a short avalanche step that scrambles the accumulated bits so that even a one-character change spreads across the whole result. The output is 32 bits — 8 hexadecimal characters.
Its appeal is that it is genuinely tiny and needs no lookup tables or setup, while still spreading keys far more evenly than the naïve “add up the characters” hashes it replaced. That combination made it a standard choice for hash tables in C for years, and it still turns up in game engines, embedded code and anywhere a string needs to become a fast integer key. Modern alternatives such as MurmurHash3 and xxHash process several bytes per step and are much faster on large inputs, but JOAAT remains a perfectly reasonable pick for short keys and is far easier to implement from memory.
It is not secure and was never meant to be. JOAAT has no resistance to a deliberate attack — given a target value, finding an input that produces it is easy. Never use it for passwords, signatures, or checking that a file has not been tampered with. It answers one question well: “which bucket does this string go in?”
Frequently asked questions
What does JOAAT stand for?
Jenkins one-at-a-time — Bob Jenkins’ hash that mixes the input one byte at a time, as opposed to his other designs that process several bytes per round.
Why is the hash always 8 characters?
JOAAT produces a 32-bit value, and each hex character represents 4 bits, so the result is always exactly 8 characters no matter how long the input is.
Can I use JOAAT for passwords or file verification against tampering?
No. JOAAT is a non-cryptographic hash-table hash with no resistance to deliberate forgery. Use bcrypt for passwords and SHA-256 where integrity actually matters.
How does JOAAT compare to MurmurHash or xxHash?
Those are considerably faster on longer inputs and distribute slightly better, but JOAAT is much simpler and needs no tables — which is why it survives in embedded and legacy code.
Is my text sent anywhere?
Your text is sent to our server to be hashed, because browsers cannot compute JOAAT. It is hashed and immediately discarded — never logged, never stored.