Free Base64 Encode & Decode API - URL-Safe

Parameters

name	in	type	required	description
`input`	body	string	required	Input Text
`action`	body	string	required	Action one of `encodedecode` default `encode`

Request

Send your key in the X-API-Key header. More languages and patterns live on the code examples page.

curl -s -X POST "https://apixies.io/api/v1/base64" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"Hello, World!","action":"encode"}'

const res = await fetch("https://apixies.io/api/v1/base64", {
  method: "POST",
  headers: {
    "X-API-Key": "YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
      "input": "Hello, World!",
      "action": "encode"
  })
});
const data = await res.json();
console.log(data);

$ch = curl_init("https://apixies.io/api/v1/base64");
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_HTTPHEADER => [
        "X-API-Key: YOUR_API_KEY",
        "Content-Type: application/json",
    ],
    CURLOPT_POSTFIELDS => '{"input":"Hello, World!","action":"encode"}',
]);
$data = json_decode(curl_exec($ch), true);
curl_close($ch);

print_r($data);

import requests

res = requests.request(
    "POST",
    "https://apixies.io/api/v1/base64",
    json={
        "input": "Hello, World!",
        "action": "encode"
    },
    headers={"X-API-Key": "YOUR_API_KEY"},
)
print(res.json())

Response

The result sits under data in the standard envelope. See the response format guide for errors and status codes.

returns

data.output: The encoded or decoded string.
data.data_uri: Decoded binary as a data URI, only when is_binary is true.
data.is_binary: On decode, true when the result isn't valid UTF-8 text.
data.mime_type: Detected type of binary output, like image/png.
data.output_length: Length of the result in bytes.

example response 200

{
    "status": "success",
    "http_code": 200,
    "code": "SUCCESS",
    "message": "Base64 encode completed",
    "data": {
        "input": "Hello, World!",
        "output": "SGVsbG8sIFdvcmxkIQ==",
        "action": "encode",
        "input_length": 13,
        "output_length": 20,
        "converted_at": "2026-09-18T12:00:00+00:00"
    }
}

Authentication and limits

This endpoint needs an API key. Use the sandbox ("try it" above) to test it without registering. See the authentication guide for details.

Standard rate limits apply to this endpoint.

Common use cases

API payload encoding

Encode binary data, images, or files as Base64 strings for transmission in JSON API payloads where binary data isn't supported.

Email attachment handling

Encode and decode email attachments that are transmitted as Base64 in MIME format. Process attachments programmatically.

Data URI generation

Encode small images or fonts as Base64 data URIs for embedding directly in HTML or CSS, reducing HTTP requests.

related endpoints

POST URL Encoder/Decoder URL-encode or decode a string POST Hash Generator Generate a cryptographic hash (MD5, SHA1, SHA256, SHA512, etc.) from input text POST JWT Decoder Decode a JWT token and extract header, payload, and claims (no signature verification)

getting started

authentication code examples response format

explore

all api endpoints guides and tutorials online tools

resources

homepage changelog suggest an endpoint

Get a free API key

A temporary key takes one click and no signup. Register and you get 75 requests/day. Free tier is for development & small projects.

get a temporary key create an account