Run a free internet speed test for download and upload Mbps, idle and loaded latency, jitter, packet loss, and bufferbloat, with clear scores for streaming, gaming, and video calls.
Measured against Cloudflare's global edge network
This is the one tool here that uses the network by design. It runs Cloudflare's official open-source speed test engine, exchanging random bytes with their public measurement endpoints. No files or personal data are sent, and reporting your result back to Cloudflare is switched off.
The test takes about 30 seconds and scales the amount of data it transfers to your connection speed.
Download
0Mbps
Upload
0Mbps
Round-trip time when idle
Variation between round trips
Messages that never arrived
Measured while the link is busy
Complete tool guide
Use this browser-based internet speed test to measure the connection this device receives now—not only the plan sold by your provider—and diagnose slow downloads, weak Wi-Fi, lag, call dropouts, packet loss, and bufferbloat.
Your input is processed in the current browser tab and is not sent to the application server.
Close other downloads, streams, and devices using the same connection.
Select "Start speed test" and leave the tab in the foreground.
Wait for latency, download, upload, and packet loss to finish.
Read the experience scores to see what the connection comfortably supports.
Start speed test runs the complete sequence, Stop ends an active measurement, and Test again replaces the current result with a new run. Keep the tab visible and the connection otherwise quiet for the fairest comparison.
Measures how quickly this device receives data. It most directly affects large downloads, high-resolution streaming, and how quickly web content loads; shared activity can lower the result.
Measures how quickly this device sends data. Upload capacity matters for video calls, cloud backups, livestreaming, and sharing large files, and is commonly lower than download on home plans.
The round-trip delay in milliseconds while the connection is not under load. Lower is better for voice, video, remote desktops, and online games; physical distance and network routing set a practical floor.
The variation between latency samples. A connection can have good average latency but still sound choppy when jitter is high because voice and video packets arrive unevenly.
The percentage of measurement messages that never arrive. Ideally it is 0%; even modest persistent loss can cause frozen video, robotic audio, game teleporting, and retransmissions.
Loaded latency measures delay while transfers fill the connection. The increase over idle is graded as bufferbloat and explains why a fast line may lag whenever someone downloads or uploads heavily.
Streaming, gaming, and real-time communication scores summarize the engine's results. Activity cards compare your measured values with practical requirements for common tasks.
Copy or download the completed result, including measurement time, speeds, latency figures, loss, and experience scores. Repeat over Wi-Fi and Ethernet to isolate wireless problems.
This tool runs Cloudflare's official open-source speed test engine, which times transfers against their global edge network using the browser's own PerformanceResourceTiming data. That measures the bytes the network actually moved rather than relying on a script's own stopwatch.
Unlike the other tools here, a speed test has to use the network. Random bytes are exchanged with Cloudflare's public measurement endpoints, and packet loss uses a short WebRTC relay connection. No page content, files, or personal data are sent, and result reporting back to Cloudflare is switched off.
Wi-Fi signal strength, other devices on the same connection, VPNs, the time of day, and the distance to the nearest edge location all move the number. Run the test a few times to get a fair picture.
Advertised speeds are the maximum to your router. Wi-Fi, older devices, a busy network, and VPNs all reduce what a single device sees. A wired test with nothing else running gives the closest comparison.
Bufferbloat is latency rising sharply while the connection is busy. It is why a video call breaks up the moment someone starts a large download, even on a fast line. The test compares idle latency with latency under load to measure it.
Under 30 ms is excellent, under 60 ms is comfortable for gaming and calls, and above 150 ms makes real-time conversation feel awkward. Jitter above roughly 30 ms causes call audio to break up even when speed is high.
Yes. A full test transfers roughly a hundred megabytes on a fast connection, and less on a slow one because the engine scales the payload to your line. On a metered or mobile connection, use it sparingly.
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