Large Test Files — Download Speed Test & Upload Testing

Linux / macOS

dd if=/dev/urandom of=testfile.bin bs=1M count=100

Node.js

const fs = require('fs');
const crypto = require('crypto');
const size = 100 * 1024 * 1024; // 100MB
const buf = crypto.randomBytes(size);
fs.writeFileSync('testfile.bin', buf);

Python

import os
with open('testfile.bin', 'wb') as f:
    f.write(os.urandom(100 * 1024 * 1024))  # 100MB

PowerShell (Windows)

$out = [System.IO.File]::Create("testfile.bin")
$out.SetLength(100MB)
$out.Close()