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xxHash64 hash generator.

Paste text or drop a file and read its xxHash64 hash as you type. xxHash64 is the 64-bit xxHash inside Zstandard and rsync: memory-speed hashing with few accidental collisions; everything runs in your browser and nothing is uploaded.64 bits16 hex characters2014 published0 bytes uploaded

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xxHash64 hash generator.

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How it works

4 steps, no account. It runs in your browser and nothing is uploaded.

  1. Enter text or a file

    Type or paste anything, or drop a file onto the input. The checksum updates with every keystroke.

  2. Pick the algorithm and format

    xxHash64 is the default; switch to xxHash32, xxHash3 and xxHash128, and read the checksum as hex or Base64.

  3. Pick the format

    Read the checksum as hex in either case, or as Base64 or Base64url; the value is re-encoded, not recomputed.

  4. Verify, copy or download

    Paste a published checksum to confirm a download, or copy and download your own.

Checksums and fast hashes

xxHash is speed without security. Hash tables, checksums, deduplication: anywhere nobody is trying to make two inputs collide.

  • CRC32

    32 bits, 1961. A polynomial division: catches every one-bit and most burst errors, trivially forged on purpose. ZIP, gzip, PNG, Ethernet.

  • CRC64

    64 bits. The same arithmetic with a longer polynomial, for large files and storage. The ECMA-182 form here: xz, Redis, Go's crc64.ECMA.

  • Adler-32

    32 bits, 1995. Two running sums modulo 65,521; faster than CRC32 and weaker on short input. The zlib trailer, so inside every PNG.

  • xxHash32

    32 bits, 2012. A non-cryptographic hash, not a CRC: good distribution for hash tables, several GB/s. LZ4 frame checksums.

  • xxHash64

    64 bits, 2014. The 64-bit variant: fewer accidental collisions at the same speed on a 64-bit CPU. Zstandard, rsync 3.2.

  • xxHash3

    64 bits, 2019. XXH3: the redesign for SIMD, fast on short keys too. The xxHash to pick for anything new.

  • xxHash128

    128 bits, 2019. XXH3's 128-bit output, for deduplication and content addressing where 64 bits is too few.

  • MD5

    128 bits, broken as a cryptographic hash and slower than every hash above. Only its ubiquity keeps it as a checksum.

Related tools

Nearby in the hash generators. Every one free, in the browser.

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Questions and answers

Before you trust the result: what to know about the format, the limits and your data.

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