We measure your speed by downloading and uploading data between your device and our servers using multiple parallel connections. This saturates your connection to get an accurate reading. We run servers across multiple regions worldwide so you're tested against a server relevant to your real-world usage, not just your local ISP.

Most speed test providers like Speedtest.net and Fast.com place testing servers as close to you as possible — often within your ISP's own network or your city. This measures the fastest possible speed in ideal conditions. how.fast tests against servers in major internet hubs (like your ISP's upstream), which better reflects the speed you'll actually experience when browsing, streaming, or downloading from the general internet.

Download speed is how fast data comes TO your device — it affects streaming, browsing, and file downloads. Upload speed is how fast data goes FROM your device — it affects video calls, uploading files, and live streaming. Most connections are asymmetric: download is faster than upload.

Ping (latency) is the round-trip time for a small packet to travel to the server and back, measured in milliseconds. Lower is better. Jitter is the variation in ping — high jitter means inconsistent latency, which affects real-time applications like gaming and video calls.

We compare your download speed against data from M-Lab (Measurement Lab), which has collected millions of speed tests worldwide. If you're "faster than 73% of connections in your country," it means 73% of tested connections there were slower than yours.

Yes, completely free. No account required, no ads.