Internet Speed Test Guide
LineProof is a free browser-based speed test for checking download speed, upload speed, ping latency, jitter, packet loss indicators, WiFi quality, broadband performance, and saved local speed test history.
What LineProof Measures
Why Results Can Differ Between Speed Test Sites
Different speed test services use different servers, transfer sizes, protocols, connection counts, and routing paths. A WiFi speed test can also change depending on router distance, interference, device CPU load, battery mode, VPNs, browser extensions, and congestion on the local network.
How to Read a Good Result
- For 4K video streaming, stable download speed and low packet loss usually matter most.
- For competitive gaming, ping and jitter are often more important than maximum download speed.
- For video calls and cloud backup, upload speed and jitter stability matter.
- For remote work VPNs, consistent latency and low packet loss are important.
Measurement Transparency
LineProof runs tests only after the user starts a measurement. Results are labeled by provider. Cloudflare Speedtest is used as the primary provider and M-Lab NDT7 runs only when the Cloudflare test fails. Values that cannot be measured from a normal browser are shown as unavailable instead of being fabricated.
Improve Your WiFi or Broadband Result
- Move closer to the router or use Ethernet for comparison.
- Pause large downloads, cloud sync, and streaming on other devices.
- Test once on WiFi and once on a wired connection if possible.
- Disable VPN temporarily if you want to measure the direct ISP path.
- Run more than one test at different times to detect congestion patterns.