Base64 Decode & Encode: to PDF, Image or Any File

import base64

b64 = base64.b64encode("Man".encode("utf-8")).decode("ascii")
print(b64)                                    # TWFu
print(base64.b64decode(b64).decode("utf-8"))  # Man

Run with Python 3.14.4 on October 26, 2026: it prints what the comments show.

const bytes = new TextEncoder().encode("Man");
const b64 = btoa(String.fromCharCode(...bytes));
console.log(b64);                                   // TWFu
const back = Uint8Array.from(atob(b64), (c) => c.charCodeAt(0));
console.log(new TextDecoder().decode(back));        // Man

Run with Node.js 22.23.2 on October 26, 2026: it prints what the comments show.

import java.util.Base64;
import static java.nio.charset.StandardCharsets.UTF_8;

public class Main {
    public static void main(String[] args) {
        String b64 = Base64.getEncoder().encodeToString("Man".getBytes(UTF_8));
        System.out.println(b64);                      // TWFu
        byte[] back = Base64.getDecoder().decode(b64);
        System.out.println(new String(back, UTF_8));  // Man
    }
}

Run with OpenJDK 25.0.2 on October 26, 2026: it prints what the comments show.

using System.Text;

var b64 = Convert.ToBase64String(Encoding.UTF8.GetBytes("Man"));
Console.WriteLine(b64);                            // TWFu
var back = Convert.FromBase64String(b64);
Console.WriteLine(Encoding.UTF8.GetString(back));  // Man

Run with .NET 10.0.103 on October 26, 2026: it prints what the comments show.

package main

import (
	"encoding/base64"
	"fmt"
)

func main() {
	b64 := base64.StdEncoding.EncodeToString([]byte("Man"))
	fmt.Println(b64) // TWFu
	back, _ := base64.StdEncoding.DecodeString(b64)
	fmt.Println(string(back)) // Man
}

Run with Go 1.25.5 on October 26, 2026: it prints what the comments show.

$b64 = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes('Man'))
$b64                                                                # TWFu
[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($b64))  # Man

Run with PowerShell 7.5.5 on October 26, 2026: it prints what the comments show.

printf 'Man' | base64        # TWFu
printf 'TWFu' | base64 -d    # Man
echo 'Man' | base64          # TWFuCg== (echo adds a newline)

Run with the base64 command of macOS 26.6 (bash) on October 26, 2026: it prints what the comments show.