🔐 Base64 Encoder/Decoder

Encode or decode Base64 strings with URL-safe support and code examples in multiple languages

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. Each Base64 digit represents exactly 6 bits of data. It's commonly used in web development for encoding images, authentication tokens, and data transmission.

Encode / Decode

Input

0 chars

Output

0 chars

URL-Safe Encoding

Replace '+' with '-' and '/' with '_' (recommended for URLs and APIs)

Remove Padding

Remove '=' padding characters from the end (some APIs require this)

Quick Examples

Code Examples - URL-Safe Base64

Base64 in Python

Encode URL-Safe

import base64

encoded = base64.urlsafe_b64encode(b'Hello, World!')
print(encoded)  # b'SGVsbG8sIFdvcmxkIQ=='

Decode URL-Safe

import base64

decoded = base64.urlsafe_b64decode(b'SGVsbG8sIFdvcmxkIQ==')
print(decoded)  # b'Hello, World!'

Base64 in PHP

Encode URL-Safe

function urlsafeEncode(string $input) {
    return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
}

Decode URL-Safe

function urlsafeDecode(string $input) {
    $remainder = strlen($input) % 4;
    if ($remainder) {
        $padlen = 4 - $remainder;
        $input .= str_repeat('=', $padlen);
    }
    return base64_decode(strtr($input, '-_', '+/'));
}

Base64 in JavaScript (Node.js)

Encode URL-Safe

const encoded = Buffer.from('Hello, World!').toString('base64url');
console.log(encoded);

Decode URL-Safe

const decoded = Buffer.from(encoded, 'base64url').toString('utf-8');
console.log(decoded);

Base64 in Go

Encode URL-Safe

encoded := base64.RawURLEncoding.EncodeToString([]byte("Hello, World!"))

Decode URL-Safe

decoded, err := base64.RawURLEncoding.DecodeString(encoded)

Base64 in C#

Encode URL-Safe

string encoded = Base64UrlEncoder.Encode("Hello, World!");

Decode URL-Safe

string decoded = Base64UrlEncoder.Decode(encoded);

Base64 in Rust

Encode URL-Safe

let encoded = base64_url::encode("Hello, World!");

Decode URL-Safe

let decoded = base64_url::decode(&encoded).unwrap();

Need Help?

Found a bug or something missing? Contact our support team or contribute on GitHub.