Cloudflare Network Calibrated
Accurate Internet Speed Test Online
Test your real-world download, upload, ping, and jitter with adaptive stream tuning and filtered throughput sampling.
Cloudflare Global Edge
Ready0% complete
ping
download
upload
Connection Quality
Pending
Run a test to grade connection quality.
Live Session
Current phaseReady
Progress0%
Live readingWaiting
PING
—ms
JITTER
—ms
DOWNLOAD
—Mbps
UPLOAD
—Mbps
Built With Care
“This test uses Cloudflare's CDN endpoints with adaptive multi-connection streams and filtered throughput sampling for accurate real-world measurements.”
Internet Speed Test
Measure your download speed, upload speed, ping, and jitter using Cloudflare's global network. Runs entirely in the browser — no Flash or Java plugin required.
No signup neededRuns offlineClient-side processing
How to Use Internet Speed Test
- 1Close background apps and pause any active downloads or streams.
- 2Click the Play button. The test runs three phases: Ping → Download → Upload.
- 3Ping measures round-trip latency and jitter to Cloudflare's global edge.
- 4Download auto-scales stream count and payload size to saturate your connection before measuring stable throughput.
- 5Upload auto-adjusts chunk size and concurrent streams based on detected line capacity.
Key Features
- Powered by Cloudflare's global content network — the same infrastructure as professional ISP diagnostics.
- Progressive payload sizing (Fast.com strategy) avoids false readings from connection warmup.
- Adaptive multi-connection streams (Ookla-style) saturate both low and high bandwidth links.
- Sample filtering trims startup spikes and unstable windows before calculating final Mbps.
- Jitter measurement to diagnose packet-burst issues affecting video calls and gaming.
- Zero plugins or native apps — runs entirely in the browser.
Real Ways People Use This
ISP Performance Verification
Verify that your internet service provider is delivering the speeds promised in your plan.
Troubleshooting Network Issues
Diagnose slow connections by measuring ping, jitter, and bandwidth to identify bottlenecks.
Pre-Video-Call Check
Test your connection quality before important video meetings or live streams.