base64 flags & options

-d, --decode

Decode base64-encoded input back to original data.

echo "aGVsbG8=" | base64 -d

base64 -d encoded.txt > decoded.bin

-w, --wrap

Wrap output lines at a specified column width (default 76, 0 disables wrapping).

base64 -w 0 file.bin

echo "hello" | base64 -w 40

-i, --ignore-garbage

Ignore non-alphabet characters when decoding.

base64 -d -i messy-input.txt

Encoding (default)

Encode a file or stdin to base64 with no flags.

base64 file.bin > encoded.txt

echo "hello world" | base64