PDFをBase64に変換する方法｜手順とおすすめツールまとめ

import base64

# Replace with your actual file path, e.g., 'C:/Users/YourName/Documents/invoice.pdf' or '/home/user/documents/report.pdf'
with open("document.pdf", "rb") as pdf_file:
base64_string = base64.b64encode(pdf_file.read()).decode('utf-8')
print(base64_string)

const fileInput = document.querySelector('input[type=file]');
fileInput.onchange = async (e) => {
const file = e.target.files[0];
const base64 = await fileToBase64(file);
console.log(base64);
};

function fileToBase64(file) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => resolve(reader.result.split(',')[1]);
reader.onerror = error => reject(error);
});
}

const fs = require('fs');

// Replace with your actual file path, e.g., '/home/user/documents/report.pdf'
const base64 = fs.readFileSync('document.pdf').toString('base64');
console.log(base64);

const fs = require('fs');

// Create a read stream for the PDF file
const stream = fs.createReadStream('document.pdf');

// Collect chunks of data
let chunks = [];

stream.on('data', (chunk) => {
chunks.push(chunk);
});

stream.on('end', () => {
// Combine all chunks into a single Buffer
const pdfBuffer = Buffer.concat(chunks);
// Convert to Base64
const base64 = pdfBuffer.toString('base64');
console.log(base64);
});

stream.on('error', (err) => {
console.error('Error reading file:', err);
});