This program is experimental and its interface is subject to change.


nix hash convert - convert between hash formats


nix hash convert [option...] hashes...


  • Convert a hash to nix32 (a base-32 encoding with a Nix-specific character set).

    $ nix hash convert --hash-algo sha1 --to nix32 800d59cfcd3c05e900cb4e214be48f6b886a08df
  • Convert a hash to the sri format that includes an algorithm specification:

    # nix hash convert --hash-algo sha1 800d59cfcd3c05e900cb4e214be48f6b886a08df

    or with an explicit --to format:

    # nix hash convert --hash-algo sha1 --to sri 800d59cfcd3c05e900cb4e214be48f6b886a08df
  • Assert the input format of the hash:

    # nix hash convert --hash-algo sha256 --from nix32 ungWv48Bz+pBQUDeXa4iI7ADYaOWF3qctBD/YfIAFa0=
    error: input hash 'ungWv48Bz+pBQUDeXa4iI7ADYaOWF3qctBD/YfIAFa0=' does not have the expected format '--from nix32'
    # nix hash convert --hash-algo sha256 --from nix32 1b8m03r63zqhnjf7l5wnldhh7c134ap5vpj0850ymkq1iyzicy5s


nix hash convert converts hashes from one encoding to another.


  • --from hash-format

    Hash format (base16, nix32, base64, sri).

  • --hash-algo hash-algo

    Hash algorithm (md5, sha1, sha256, or sha512). Can be omitted for SRI hashes.

  • --to hash-format

    Hash format (base16, nix32, base64, sri). Default: sri.

  • --debug

    Set the logging verbosity level to 'debug'.

  • --log-format format

    Set the format of log output; one of raw, internal-json, bar or bar-with-logs.

  • --print-build-logs / -L

    Print full build logs on standard error.

  • --quiet

    Decrease the logging verbosity level.

  • --verbose / -v

    Increase the logging verbosity level.

Miscellaneous global options

  • --help

    Show usage information.

  • --offline

    Disable substituters and consider all previously downloaded files up-to-date.

  • --option name value

    Set the Nix configuration setting name to value (overriding nix.conf).

  • --refresh

    Consider all previously downloaded files out-of-date.

  • --version

    Show version information.


See man nix.conf for overriding configuration settings with command line flags.