Internet Speed Test
Measure ping, jitter, download and upload speed.
Use the Internet Speed Test tool
What this internet speed test does
Internet Speed Test measures round-trip latency, jitter, download throughput and upload throughput by exchanging data with Cloudflare's public speed endpoint. The result reflects this browser, this network and the Cloudflare edge it reached, not a guaranteed line rate.
The quick test transfers about 6 MB and the standard test about 12 MB. Nothing is installed and no account is needed. Close other downloads, streaming and backups before testing if you want a representative result.
Why use it
- Check whether a slow page is caused by the connection or by the site.
- Compare Wi-Fi and Ethernet, or two rooms, with the same test.
- Record a baseline before calling an ISP about a fault.
- See whether latency or raw bandwidth is the problem for calls and games.
How to use it
- 1Choose Quick or Standard, depending on your data allowance.
- 2Choose Start test and leave the tab open while it runs.
- 3Read the four results: ping, jitter, download and upload.
- 4Run it again at a different time or on another connection before drawing conclusions.
Worked examples
Quick check
Input
Quick test over home Wi-Fi
Output
A ping, jitter, download and upload figure, plus the Cloudflare edge and time.
Before and after
Input
Standard test on Wi-Fi, then on Ethernet
Output
Two comparable results that show whether the Wi-Fi link is the bottleneck.
Common mistakes
- Testing while a phone, console or backup job is using the same connection.
- Comparing a browser result with an ISP's own speed-test server and expecting identical numbers.
- Reading a single run as a permanent line speed; congestion and routing change during the day.
- Assuming a fast download makes video calls smooth; latency and jitter matter just as much.
Frequently asked questions
How much data does the test use?
About 6 MB for Quick (5 MB down and 1 MB up) and about 12 MB for Standard (10 MB down and 2 MB up). The small latency requests add a few kilobytes.
Why does the result differ from my ISP's test?
The measurement server, route, browser overhead and current network load all differ. Neither result is wrong; use the same method when comparing two connections.
Is the test private?
Cloudflare sees the request and returns the edge location and network information to the browser. The test does not create an account or keep a history, but it does send 1–2 MB of generated data to Cloudflare's upload endpoint. Cloudflare's own policies apply to its service.
What are ping and jitter?
Ping is the median round-trip time of small requests. Jitter is the average change between consecutive samples. Low, stable numbers are better for calls and games.
Can I stop the test?
Yes. Choose Cancel while it is running. No partial result is recorded and the remaining data is not transferred.