Test de Réseau et de Débit Internet.

Press Start and keep this tab in the foreground. The tool first measures latency (ping) and jitter by timing a burst of tiny requests, then downloads a real file to measure your download speed in Mbps. Within a few seconds you'll see all three numbers in the results panel. For a reliable picture, close other downloads and streams first and run the test a few times — a healthy connection lands in a tight, repeatable band.

Several things sit between you and the promised number. Wi-Fi loses speed with distance and walls, so a wired connection almost always tests faster. Other devices and tabs share your link. And a browser test opens far fewer connections than a dedicated app, so on very fast plans it can under-read simply because a single stream can't fill the pipe. Getting most of your plan over Wi-Fi is normal; getting a small fraction of it is worth investigating.

Bandwidth (your download speed) is how much data can flow per second — it decides how fast big things load. Latency (ping) is how long a single small request takes to make the round trip — it decides how responsive the connection feels. A fast link with high latency still feels laggy for calls and gaming, while a modest link with low, steady latency can feel perfectly snappy. They're independent, which is why this test reports both.

Jitter is how much your latency varies from one request to the next. Real-time audio and video assume packets arrive at a steady rhythm; when jitter is high they arrive bunched up or late, which is what makes a call stutter or a game rubber-band even though the average ping looks fine. This tool measures jitter as the mean difference between consecutive round trips, so a low number means a steady, predictable connection.

Not reliably from inside a browser, so we don't pretend to. This tool focuses on the measurements it can make honestly: download throughput, latency and jitter, timed against a nearby server. True upload benchmarking and real packet-loss measurement need capabilities browsers restrict for privacy and security reasons — a dedicated desktop app or your router's own tools are better suited to those. We'd rather report three solid numbers than four with one of them faked.

Both, clearly separated. The big gauge and the results panel are live measurements — the tool actually transfers data and times it. The "Connection" panel on the left shows your browser's own Network Information API estimates (effective type, downlink, round-trip time), which are a coarse hint your device reports without measuring anything. When the live test can't reach the network, we fall back to that estimate and label it as such, so you always know which number came from where.

Completely. It's free, needs no sign-up, and the measurement runs in your browser. The only network traffic is the test transfer itself, to a public speed-test endpoint used to time your connection — your results are never uploaded to us, and there are no servers of ours receiving them. Only your theme and language preferences are saved, in this browser's local storage.