A speed test that works anywhere
SpeedFibre measures the real speed of your internet connection, whatever the technology: fibre, cable, DSL, 4G or 5G home internet, satellite, or your phone's mobile data. It works with any provider in any country, detects yours automatically and measures well beyond 1 Gbps.
The test runs against the closest server on Cloudflare's global network, which has points of presence in hundreds of cities. Speed is calculated over several seconds of continuous transfer, the way Speedtest by Ookla and Google's test do, so a short burst at the start cannot inflate the result.
What the test measures
- Ping and jitter: small packets travel to the server and back; we show each one so you can see how stable the connection is.
- Download: files of increasing size are downloaded until your line is saturated for several seconds.
- Upload: the same in the other direction.
- Latency under load: ping measured while the line is busy. This is what causes lag in games and frozen video calls when someone else is downloading, and few tests show it.
Results are in megabits per second (Mbps). Your browser shows downloads in MB/s, which is 8 times smaller: see Mbps vs MB/s.
Reading your results
| Metric | What it measures | Good value |
|---|---|---|
| Download | Receiving: video, web pages, downloads | 50 Mbps or more for a household |
| Upload | Sending: video calls, cloud backup, streaming | 10 Mbps or more, 50+ for creators |
| Ping | Response time, in milliseconds | Under 30 ms on fibre or cable |
| Jitter | How much ping varies | Under 10 ms |
| Latency under load | Ping while the line is busy | Less than 30 ms above idle ping |
After the test, the gaming, video-call and streaming scores tell you in one glance what your connection can handle. More detail in how to read speed test results.
Fibre, cable, DSL, 5G or satellite: what changes
Fibre (FTTH). The fastest and most stable: on a cable you should get close to your plan. See the fibre speed test.
Cable (DOCSIS). High download speeds, often a much lower upload, and evening slowdowns in busy areas. Compare in fibre vs cable vs 5G.
DSL. Speed drops with the length of the phone line. See the DSL speed test.
4G and 5G. Speed depends on signal, time of day and the device. See the mobile speed test.
Satellite. Low-orbit services now offer usable latency; older geostationary ones remain slow to respond. Read satellite internet speed and latency.
Why results differ between tests
Each tool measures against its own servers with its own method. A gap of 5 to 10% between two tests is normal; a gap of 50% points to Wi-Fi, a busy server or throttling. Full comparison: Speedtest vs Fast.com vs Google.
5 rules for a reliable test
- Test at least once over an Ethernet cable to rule out Wi-Fi.
- Pause downloads, updates and streaming on other devices.
- Close tabs and apps that use the internet.
- Test at different times: speed often drops in the evening.
- Enter your plan speed in the result to see the percentage you really get.
Not sure what speed you need? Answer our 3-question quiz.
Frequently asked questions
Is the speed test free?
Yes, completely free, with no sign-up and no app. It runs in the browser on computers, tablets and phones.
Is this speed test accurate?
It measures speed over several seconds of continuous transfer against the closest server. Results are usually within a few percent of Speedtest by Ookla or Google's test on the same line.
Does it work in my country?
Yes. The test uses Cloudflare's global network and picks the closest server automatically, wherever you are.
Can I test 4G or 5G?
Yes. Turn off Wi-Fi on your phone and start the test: it then measures your mobile connection.
What is a good internet speed?
For a household with several screens, 100 to 300 Mbps is comfortable. One person who browses and streams in HD is fine with 25 to 50 Mbps. Ping matters as much as speed for gaming and calls.
Why is my result lower than my plan?
Wi-Fi, distance to the router, other devices and peak hours all reduce real speed. Test over a cable to see what actually reaches your router.
Does the test use my mobile data?
Yes. On a fast connection a full test can use several hundred MB. Use Wi-Fi if your data plan is limited.
