Test your Internet connection. Check your network performance with our Internet speed test. Powered by Cloudflare's global edge network. Use Speedtest on all your devices with our free desktop and mobile apps. Use Speedtest on all your devices with our free desktop and mobile apps. Check your internet speed with our simple and fast speed test. Get detailed results for your download speed, upload speed, and personalized insights into your connection performance. Fast.com estimates your current internet download speed. You will generally be able to get this speed from leading internet services, which use globally distributed servers. How fast is your download speed? In seconds, FAST.com's simple Internet speed test will estimate your ISP speed. ¿Cuál es tu velocidad de descarga? En segundos, la prueba de velocidad de internet de FAST.com calcula la velocidad de tu ISP.