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CRC64 hash generator.

Paste text or drop a file and read its CRC64 checksum as you type. CRC64 is CRC32's 64-bit cousin for large files and storage, in the ECMA-182 form xz and Redis use; everything runs in your browser and nothing is uploaded.64 bits16 hex characters1975 published0 bytes uploaded

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CRC64 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

    CRC64 is the default; switch to CRC32 and Adler-32, 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

A checksum catches accidents. Flipped bits, truncated downloads, a bad sector. None of these resist someone who wants a collision.

  • 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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