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A little help, from Zutilium.
Free online tool
Speed Test
Measure your browser connection to Cloudflare test endpoints
Upload a file
Drop your file here
or click anywhere to browse
Download and upload measurements
The browser transfers measurement data to and from Cloudflare endpoints to estimate transfer speed.
Latency and jitter
Repeated requests provide an HTTP round-trip latency estimate and variation between samples.
Live test display
Follow the gauge and metric cards while each test phase runs, then compare repeated measurements.
How to Use Speed Test
- 1
Close other bandwidth-heavy activity and consider any metered-data allowance.
- 2
Start the test and allow the latency, download, and upload phases to finish.
- 3
Review the metrics and repeat under comparable conditions if needed.
What people use this tool for
- Compare Wi-Fi and wired performance on the same device.
- Check a connection before a video call or large transfer.
- Track how a connection behaves at different times of day.
Frequently Asked Questions
Which server receives the test traffic?
The browser connects directly to speed.cloudflare.com download and upload endpoints. Cloudflare receives those measurement requests; this is not a test confined to Zutilium servers.
Is this a guaranteed measure of my ISP plan speed?
No. Device performance, browser behavior, Wi-Fi, other traffic, VPN routing, and the path to the test server can affect results. The test uses sequential transfer requests rather than a validated multi-connection benchmark.
Does the test use real data?
Yes. Download and upload phases each target about 12 seconds of transfers. Faster connections can transfer substantial data, so consider your mobile or metered connection allowance.
What does ping mean here?
It is a timing estimate from HTTP requests, not an ICMP network ping. Compare results from the same setup and endpoint rather than treating different test methods as identical.
How can I compare results?
Close competing downloads or streams and repeat the test using the same device and connection. Compare Wi-Fi and wired connections or different times of day.