FASTBASE64.COREUTILS(1)          User Commands         FASTBASE64.COREUTILS(1)

NAME
       fastbase64.coreutils - base64 encode/decode data and print to standard
       output (coreutils compatible)

SYNOPSIS
       fastbase64.coreutils [OPTIONS...] [INPUTFILE]

DESCRIPTION
       fastbase64.coreutils encodes or decodes base64 data using the high-
       performance simdutf library, with options compatible with GNU coreutils
       base64, plus clearly marked fastbase64-specific extensions.  By
       default, it encodes binary input to base64 output. On large files, it
       can be several times faster than standard base64 tools.

       fastbase64 extension (not present in GNU coreutils base64): If a second
       filename is provided, it is used as the output file.  Otherwise, output
       goes to standard output. The -o option takes precedence over positional
       output file.

OPTIONS
       -b, --break=NUM
              synonym to --wrap. (not in GNU coreutils base64)

       -w, --wrap=NUM
              Wrap encoded lines after NUM characters (default 76). Use 0 to
              disable line wrapping.

       -d, -D, --decode
              Decode input.

       -e, --encode
              Encode input (default).

       --ignore-garbage
              When decoding, ignore non-alphabet characters.

       -i, -n, --noerrcheck
              fastbase64 extension (not present in GNU coreutils base64): when
              decoding, ignore non-alphabet characters (same as
              --ignore-garbage).

       -h, --help
              Display help message and exit.

       -o, --output=FILE
              fastbase64 extension (not present in GNU coreutils base64):
              output file (default: "-" for stdout).

       --version
              Output version information and exit.

EXAMPLES
       Encode a file:
              fastbase64.coreutils myfile.txt

       Decode base64 data ignoring garbage:
              fastbase64.coreutils -d -i < encoded.txt

SEE ALSO
       base64(1), fastbase64(1)

AUTHOR
       Written by the simdutf development team.

simdutf                           March 2026           FASTBASE64.COREUTILS(1)