Base64 to File Converter

// Convert file to Base64
function fileToBase64(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = () => {
      const base64 = reader.result; // Includes data URL prefix
      resolve(base64);
    };
    reader.onerror = reject;
    reader.readAsDataURL(file);
  });
}

// Usage with file input
document.querySelector('input[type="file"]').addEventListener('change', async (e) => {
  const file = e.target.files[0];
  const base64 = await fileToBase64(file);
  console.log(base64); // data:application/pdf;base64,JVBERi0x...

  // Get only Base64 string (without prefix)
  const base64Only = base64.split(',')[1];

  // Get file info
  console.log('File name:', file.name);
  console.log('File size:', file.size, 'bytes');
  console.log('File type:', file.type);
});

// Convert multiple files
async function convertMultipleFiles(files) {
  const results = [];

  for (const file of files) {
    const base64 = await fileToBase64(file);
    results.push({
      name: file.name,
      type: file.type,
      size: file.size,
      base64: base64.split(',')[1]
    });
  }

  return results;
}

import base64
import os

# Convert file to Base64
def file_to_base64(file_path):
    with open(file_path, "rb") as file:
        encoded = base64.b64encode(file.read())
        return encoded.decode('utf-8')

# Usage
base64_string = file_to_base64("document.pdf")
print(f"Base64 length: {len(base64_string)}")

# Get file info
import mimetypes

def file_to_base64_with_info(file_path):
    # Get MIME type
    mime_type = mimetypes.guess_type(file_path)[0]

    # Get file size
    file_size = os.path.getsize(file_path)

    # Encode to Base64
    with open(file_path, "rb") as file:
        base64_str = base64.b64encode(file.read()).decode('utf-8')

    return {
        'filename': os.path.basename(file_path),
        'mime_type': mime_type,
        'size': file_size,
        'base64': base64_str
    }

# Convert multiple files
def convert_directory(directory_path):
    results = []

    for filename in os.listdir(directory_path):
        file_path = os.path.join(directory_path, filename)

        if os.path.isfile(file_path):
            result = file_to_base64_with_info(file_path)
            results.append(result)

    return results

# Usage with JSON
import json

file_data = file_to_base64_with_info("document.pdf")
json_output = json.dumps(file_data, indent=2)
print(json_output)

<?php
// Convert file to Base64
function fileToBase64($filePath) {
    $fileData = file_get_contents($filePath);
    $base64 = base64_encode($fileData);

    // Get MIME type
    $finfo = finfo_open(FILEINFO_MIME_TYPE);
    $mimeType = finfo_file($finfo, $filePath);
    finfo_close($finfo);

    return [
        'filename' => basename($filePath),
        'mime_type' => $mimeType,
        'size' => filesize($filePath),
        'base64' => $base64
    ];
}

// Usage
$result = fileToBase64("document.pdf");
echo "File: " . $result['filename'] . "\n";
echo "Size: " . $result['size'] . " bytes\n";
echo "Base64 length: " . strlen($result['base64']) . "\n";

// For API response
header('Content-Type: application/json');
echo json_encode($result);

// Convert uploaded file
if ($_FILES['file']['error'] === UPLOAD_ERR_OK) {
    $tmpPath = $_FILES['file']['tmp_name'];
    $result = fileToBase64($tmpPath);

    // Send as JSON
    header('Content-Type: application/json');
    echo json_encode($result);
}

// Batch convert files
function convertMultipleFiles($directory) {
    $results = [];
    $files = glob($directory . '/*');

    foreach ($files as $file) {
        if (is_file($file)) {
            $results[] = fileToBase64($file);
        }
    }

    return $results;
}
?>

const fs = require('fs').promises;
const path = require('path');
const mime = require('mime-types');

// Convert file to Base64
async function fileToBase64(filePath) {
  const buffer = await fs.readFile(filePath);
  return buffer.toString('base64');
}

// Get file info with Base64
async function fileToBase64WithInfo(filePath) {
  const stats = await fs.stat(filePath);
  const buffer = await fs.readFile(filePath);
  const base64 = buffer.toString('base64');
  const mimeType = mime.lookup(filePath) || 'application/octet-stream';

  return {
    filename: path.basename(filePath),
    mimeType,
    size: stats.size,
    base64
  };
}

// Usage
(async () => {
  const result = await fileToBase64WithInfo('document.pdf');
  console.log('File:', result.filename);
  console.log('Size:', result.size, 'bytes');
  console.log('Base64 length:', result.base64.length);
})();

// Express.js API endpoint
const express = require('express');
const multer = require('multer');
const upload = multer({ storage: multer.memoryStorage() });
const app = express();

app.post('/api/file/encode', upload.single('file'), async (req, res) => {
  if (!req.file) {
    return res.status(400).json({ error: 'No file uploaded' });
  }

  const base64 = req.file.buffer.toString('base64');

  res.json({
    filename: req.file.originalname,
    mimeType: req.file.mimetype,
    size: req.file.size,
    base64
  });
});

// Convert multiple files
async function convertDirectory(directoryPath) {
  const files = await fs.readdir(directoryPath);
  const results = [];

  for (const file of files) {
    const filePath = path.join(directoryPath, file);
    const stats = await fs.stat(filePath);

    if (stats.isFile()) {
      const result = await fileToBase64WithInfo(filePath);
      results.push(result);
    }
  }

  return results;
}