Measure download speed, upload speed, ping and jitter against Cloudflare's nearby edge network.
What leaves your device: generated test bytes only. No personal files are uploaded. Final-result logging in the Cloudflare test module is disabled.
The test exchanges generated measurement data with Cloudflare's edge network. It begins with latency samples, then uses staged 100 kB, 1 MB and 10 MB download and upload payloads so faster connections receive enough work for a useful estimate. A full run is capped at roughly 25 MB of traffic and result logging is disabled.
Download and upload describe the route from this browser to the selected edge during the run, not an unconditional promise from the provider. Wi-Fi interference, other users, VPNs, peering, server location and device performance all matter. Repeat at different times before reporting a persistent connection problem.
This estimates how quickly data reached the browser. Streaming and large downloads mainly depend on this direction.
This estimates how quickly generated data left the browser. Video calls, cloud backups and sending large files use it.
Round-trip latency measures response delay in milliseconds. Interactive calls and games can feel delay even when throughput is high.
Variation between latency samples can cause uneven real-time audio or gameplay. A stable connection generally has lower variation.
This browser test does not inspect provider equipment, guarantee last-mile capacity or measure every destination on the internet. Traffic shaping, VPN routing, browser limits and the chosen Cloudflare edge can affect the estimate.
Read our complete testing methodology →This lightweight configuration transfers no more than roughly 25 MB across download and upload measurements, and may stop earlier on slower connections.
Generated test traffic is exchanged with Cloudflare's edge network, which normally routes the request to a nearby available data center.
Wi-Fi conditions, VPNs, device performance, network congestion and the route to the test server can all reduce measured throughput.
No. It sends generated measurement payloads only and never opens or transfers personal files, messages or photos.
Yes, but the staged run can use up to roughly 25 MB. Check your data allowance and avoid repeated runs on a limited plan.
A VPN can add distance and processing. Compare with and without it only if doing so is permitted and safe; the VPN-on result is still representative of normal VPN use.