• C#

byte[] bytes = Convert.FromBase64String(s);

• Dart

var bytes = base64Decode(s);

• Go

data, err := base64.StdEncoding.DecodeString(s)

• Groovy

final data = s.decodeBase64()

• JS

var data = atob(s)

• Java

byte[] data = Base64.getDecoder().decode(s);

• Kotlin

String(Base64.getDecoder().decode(s))

• Pascal

data := DecodeStringBase64(s, true);

• Perl

my @s = decode_base64($data);

• Python

data = base64.decode(s)

• Ruby

data = Base64.strict_decode64(s)

• Rust

let bytes = base64::decode(s).unwrap();

• VB

Dim bytes As Byte() = Convert.FromBase64String(s)