djb2 Hash Generator - Daniel Bernstein String Hash Online

Generate djb2 hashes for string hashing. Simple, fast algorithm by Daniel J. Bernstein. Perfect for hash tables. Free online djb2 calculator.

Input String

Variant

Algorithm

unsigned long djb2(char *str) {
    unsigned long hash = 5381;
    int c;
    while ((c = *str++))
        hash = ((hash << 5) + hash) + c;
        /* hash * 33 + c */
    return hash;
}

djb2 Hash (32-bit)

djb2 Hash (Full 64-bit)

Decimal (32-bit)

Modulo 1000

Hash Info

Algorithm: djb2

Initial: 5381

Multiplier: 33

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Frequently Asked Questions

djb2 is a simple, efficient string hashing algorithm created by Daniel J. Bernstein. It uses the magic number 33 and produces excellent distribution for hash tables with minimal code.

djb2 starts with hash = 5381, then for each character: hash = hash * 33 + c. The magic constant 33 and initial value 5381 were chosen empirically for good distribution.

djb2 is used in string hash tables, caching systems, many programming language implementations, and embedded systems where simple, fast hashing is needed.

5381 is a prime number that empirically produces good hash distribution. Combined with multiplier 33, it minimizes collisions for typical string inputs.

No. djb2 is designed for speed and distribution in hash tables, not security. It's trivial to find collisions. Use SHA-256 or BLAKE3 for security purposes.

Both are simple string hashes. djb2 uses hash*33+c, while sdbm uses hash*65599+c. Both produce good distribution; djb2 is more commonly used.

djb2a (or djb2 XOR variant) uses hash*33 XOR c instead of addition. Some implementations prefer XOR for slightly different distribution characteristics.

Yes. All computation happens in your browser using JavaScript. Your data never leaves your device.

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