Measures download, upload, ping and jitter of your connection directly in your browser, using Cloudflare's global network.
Speed tests vary depending on the server used, time of day, network congestion and even the browser. Small differences between tools are normal; large, recurring differences may indicate a specific route limitation to a service.
Jitter is how much your ping varies over time. High jitter can cause stutter in video calls and online games, even with a low average ping.
Yes — downloads, uploads, cloud backups or other devices using the same network during the test will lower the measured result.