How to use this test
Stay on the connection you want to compare
Use the Wi-Fi or network you want to check and pause large transfers if practical.
Measure once
Choose Measure speed and let the download and upload complete.
Compare carefully
Run a second sample if needed; short tests can vary with server load and network activity.
What we check
The page downloads a 2 MB file from this site, then posts a matching 2 MB sample back to its measurement endpoint.
It divides the transferred bytes by browser timing for a short result in Mbps.
What this test can’t tell you
It cannot see Wi-Fi signal strength, identify the radio band, measure every destination, or separate your router, ISP and server limits.
Something not working?
The upload is unavailable
A static host needs a same-site upload endpoint for the second half of this check. The page will say so instead of inventing a result.
The result changes
That is normal for a small transfer. Try again after pausing downloads, streams and cloud backups.
Common questions
Does it prove my Wi-Fi is the problem?
No. It measures the path between this browser and this website, not Wi-Fi hardware alone.
Why is this different from another speed test?
Each service uses different files, locations, durations and server capacity.