Ping (latency)
How long a packet takes to reach the server and come back. Lower is more responsive. For gaming and calls, up to ~60 ms is comfortable and up to ~120 ms is acceptable.
Internet stability test
See how steady your connection really is: across 25 quick probes we measure ping (latency), jitter (how much it fluctuates) and packet loss — then tell you in plain words whether it's good enough for calls, gaming and video. Everything is computed right in your browser.
Probes run from your browser to our server. We don't log or store any measurement results.
Press “Run test” — we send a series of short requests and, from their round-trip time, estimate latency, its fluctuation and the share of lost packets. It takes a few seconds and nothing needs to be installed.
The test sends 25 probes to our server. Accuracy depends on the current load on your device and network — for reliability you can run it a couple of times.
All probes run from your browser to our server, and the calculation happens on your device. We don't log or store measurement results.
What the test shows
Together these three metrics describe not speed but steadiness — exactly what calls, gaming and video depend on.
Jitter
How much latency jumps from probe to probe. High jitter matters more than high ping: it's what breaks up audio and stutters real-time video.
Packet loss
The share of probes that never arrived. Even 1–2% loss is noticeable in video calls and games — you get stutters and repeated “what did you say?”.
When it helps
Video calls keep dropping
Tell whether it's your connection or the other side: high jitter and loss directly explain why audio cuts out and video freezes.
Lag in online games
Check ping and stability before a match. Steady low ping matters more than the big “speed” number in your plan's ad.
Compare Wi-Fi and cable
Run the test on different connections and spots in your home and see where the link is steadier and where the signal jumps.
More LiMP tools
Free network, privacy and security checks right in your browser — no install, no sign-up.
What internet stability is and why it isn't speed
Speed (megabits per second) is about how fast a large file downloads. But the quality of calls, online games and video depends not on speed but on stability: how evenly and without gaps the data flows. A connection can post a high speed-test number and still break up calls — if its latency jumps or packets get lost.
This test measures exactly that steadiness. Your browser sends a series of short probes to our server and, from their round-trip time, computes three metrics: ping, jitter and packet loss.
Ping, jitter and packet loss — what they mean
- Ping (latency) — the time for a packet to reach the server and return. Measured in milliseconds; lower is more responsive.
- Jitter — how much latency fluctuates between probes. A steady 80 ms is better than jumps from 20 to 200 ms: jitter is what breaks audio and stutters video.
- Packet loss — the share of probes that never arrived. In real time even small loss causes stutters and artefacts.
- Spread — the gap between the fastest and slowest probe; a clear picture of how much latency wanders.
Which values count as good
For comfortable calls and gaming, ping up to 60 ms is good and up to 120 ms is acceptable. Jitter is best kept below 30 ms, and packet loss near zero; even 2–3% loss shows up in video calls. Ordinary browsing and video streaming tolerate weaker numbers, because they buffer data ahead of time.
Exact thresholds depend on the task, so the test doesn't just print numbers — it turns them into a plain verdict on whether your connection is good enough for calls, gaming and streaming right now.
Why a connection can be unstable
The most common causes of jumps and loss are congested or noisy Wi-Fi, a weak signal far from the router, many devices on one channel, and an overloaded or throttled ISP link. Sometimes a provider deliberately slows specific services (throttling) — then the link is steady to some addresses and keeps breaking to others.
If the problem is the route to specific services or throttling, a VPN can help: traffic goes through an encrypted tunnel and a server with a different path, so the provider can no longer selectively squeeze the connection. It won't improve the Wi-Fi radio link itself, though — for that, getting closer to the router, using a cable or a less busy channel helps.
Frequently asked questions about connection stability
Speed shows how much data passes per second — that matters for downloads. Stability shows how evenly the data flows: latency, its fluctuation and loss. Calls, gaming and video depend on stability, not on the “megabits” in a plan's ad. A connection can be fast and still unstable.
For calls and gaming, ping up to 60 ms is comfortable and up to 120 ms is acceptable, jitter is best below 30 ms, and packet loss near zero. Ordinary browsing and video tolerate higher values because data is buffered ahead of time. The test itself turns the numbers into a plain verdict.
For real-time communication, jitter and packet loss are often more harmful than a high ping by itself. A steady 100 ms is easier to handle than jumps from 20 to 200 ms: the fluctuation breaks audio and stutters video even when the average ping looks acceptable.
The browser measures round-trip time to our server, which reliably reflects latency and its fluctuation. But the absolute values depend on your device's current load and on what the tab is doing, so treat the result as an estimate rather than a lab measurement. For reliability, run the test a couple of times.
Sometimes. If your ISP throttles specific services or the route to them is unstable, a VPN routes traffic through its own link and a server with a different path — so the provider can't selectively squeeze the connection. But it won't fix the Wi-Fi itself (weak signal, interference): for that, move closer to the router, use a cable or a less busy channel.
No. Probes run from your browser to our server, and all the calculation happens on your device. We don't log or keep results or any test history.