XXH64 Calculator

What is XXH64?

XXH64 is the 64-bit member of the original xxHash family. It produces a 16-digit hexadecimal checksum and is widely used for fast non-cryptographic hashing on 64-bit platforms. For the newer algorithm family, see XXH3 and XXH128.

How to calculate XXH64

Enter text, upload a file, or provide a URL. Optionally set a 64-bit seed, choose Hex or Base64 output, then click Hash. File and URL modes hash raw bytes; text mode uses the selected input encoding.

Seed

Seed is a hexadecimal value of up to 16 digits (0000000000000000–FFFFFFFFFFFFFFFF). Leave it at 0 unless a protocol or API specifies another value. Enter hex digits only, without a 0x prefix.

Result example

UTF-8 abc with seed 0 produces 44bc2cf5ad770999.

Related calculators

• XXHash for all variants on one page
• XXH32, XXH3, XXH128