FASTBASE64(1) User Commands FASTBASE64(1) (NAME) fastbase64 - base64 (SYNOPSIS) fastbase64 [-Ddh] [-b num] [-i in_file] [-o out_file] (DESCRIPTION) fastbase64 base64 simdutf . base64 . base64 . . (OPTIONS) -b, --break num num ( ) -D, -d, --decode -h, --help -i, --input in_file (: "-" stdin) -o, --output out_file (: "-" stdout) -w, --wrap=NUM -b -e, --encode () --ignore-garbage --version (EXAMPLES) ( ): fastbase64 -i myfile.txt base64: fastbase64 -d -i encoded.txt : fastbase64 -b 76 -i myfile.txt (SEE ALSO) base64(1), fastbase64.coreutils(1), iconv(1) (AUTHORS) simdutf. simdutf March 2026 FASTBASE64(1)