Split large CSV, TXT, ISO into smaller chunks free online tool

    dd if=/dev/urandom of=./test.img bs=1M count=400 2>/dev/null;md5sum ./test.img;split -n4 ./test.img _split. ;ls -alh test* _split*;rm -f ./test.img;cat _split.* > ./test_joined.img;md5sum ./test_joined.img 

    30e3089819b9af5985b90014cf68360b  ./test.img
    100M Mar  4 15:49 _split.aa
    100M Mar  4 15:49 _split.ab
    100M Mar  4 15:49 _split.ac
    100M Mar  4 15:49 _split.ad
    400M Mar  4 15:49 test.img
    30e3089819b9af5985b90014cf68360b  ./test_joined.img

    dd        : create a file
    md5sum    : get checksum of the file
    split -n4 : split file into 4 chunks
    ls        : view what we created
    rm        : remove the original input file
    cat       : join the files back together
    md5sum    : verify the joined file matches the original