Test your internet speed
Measure download, upload, ping and jitter in your browser. The test starts only when you choose.
Use practical guides to compare Wi-Fi and Ethernet, troubleshoot slow speeds, and choose enough bandwidth for your household.
For one person, 25 Mbps down and 5 Mbps up covers HD streaming, calls and browsing. A busy household with several 4K screens, gaming and video calls is more comfortable at 100 Mbps or more. The bandwidth calculator adds up your own devices.
On this page
- What this result shows
- Your result
- Before and after your fix
- Understand and improve your connection
- Know your numbers
- What is a good internet speed?
- Download and upload
- Ping and jitter
- Wi-Fi or cable
- Why results change
- What Is FastSpeedTest and How Does It Work?
- Why is FastSpeedTest accurate?
Download is data coming to you: video, web pages, game updates. Upload is data you send: your camera on a call, backups, files you share. Many cable and DSL plans give far less upload than download, which is why calls can struggle on a fast plan. Read more .
Ping is the time for a small request to reach the test server and come back. Jitter is how much that time jumps between requests. A steady 60 ms usually feels better in a call than a 30 ms average that keeps spiking. See what a good ping is and what jitter means .
Wi-Fi loses speed through walls, distance and busy channels. Testing once next to the router and once on an Ethernet cable tells you whether the slowdown is inside your home or on the line. Compare the two tests side by side.
Other devices, evening peak hours, VPNs, browser extensions and the distance to the test server all move the numbers. That is also why different speed test sites show different results. Here is why .
FastSpeedTest is a free, browser-based internet speed test that measures your real download speed, upload speed, ping and jitter in about 20 seconds. Unlike app-based tools, it runs entirely inside your browser, on any phone, tablet or laptop, with nothing to install.
When you tap Run Speed Test , your device exchanges data with the nearest of 300+ Cloudflare edge locations worldwide. Because the test server is geographically close, the result reflects the speed you actually experience day to day, not a best-case lab number. We measure four things that matter:
Your results stay on your device in local history . We never store personal data on a server. You can also share results with a unique link, export to PDF or PNG, and track trends over time.
Most speed tests connect to a single server, often hundreds of miles away. FastSpeedTest routes your test to Cloudflare's nearest edge node using anycast, which means the connection crosses as few network hops as possible. We run multiple parallel streams, ramp payload size dynamically (500 KB to 5 MB), and discard the slowest and fastest samples to reduce noise. The result is a stable, reproducible number you can compare across tests. Learn exactly how the engine works .
WiFi signal strength degrades through walls, floors, and interference from electronics. Place your router centrally and elevated. Run a WiFi speed test before and after repositioning to measure improvement. This alone can boost your download speed by 20 to 40 percent. Read the full router placement guide .
Key points
- Download speed (Mbps): how fast data arrives at your device. Determines how quickly pages load, videos buffer, and files download.
- Upload speed (Mbps): how fast your device sends data out. Critical for video calls, cloud backups, and live streaming.
- Ping / latency (ms): the round-trip time for a single packet. Lower is better, especially for gaming and real-time apps.
- Jitter (ms): how much your ping varies from packet to packet. High jitter causes stuttering in calls and rubber-banding in games.
Frequently asked questions
- How accurate is this internet speed test?: FastSpeedTest measures your actual connection speed by transferring data to and from Cloudflare's global edge network, the same infrastructure used by millions of websites. Results reflect real-world download speed, upload speed, ping, and jitter. For the most accurate results, close other tabs, pause downloads, and test on a wired connection.
- What is jitter and why does it matter for gaming?: Jitter measures variation in ping times. High jitter causes stuttering in video calls, rubber-banding in online games, and buffering during streams. For competitive gaming, jitter should be under 10 ms.
- What internet speed do I need for 4K streaming, gaming, and Zoom?: For 4K Netflix/YouTube streaming: 25+ Mbps download. For competitive gaming: ping under 30 ms and jitter under 10 ms matter most. For Zoom/Teams video calls: 10+ Mbps upload. For working from home with multiple devices: 100+ Mbps is recommended.
- How does bufferbloat affect my connection?: Bufferbloat causes ping spikes from 20 ms to 500 ms+ during heavy downloads or uploads. This makes video calls choppy and games laggy even with fast broadband. Enable SQM/QoS on your router to fix it.
- Why is my actual speed lower than what my ISP advertises?: ISPs advertise 'up to' speeds under ideal lab conditions. Real speeds depend on network congestion, WiFi interference, router quality, number of connected devices, and distance from your ISP's node. Track whether you consistently get less than 80% of your advertised speed, which may warrant an ISP complaint.
- Does this speed test work on mobile phones and tablets?: Yes. FastSpeedTest runs entirely in your browser, with no app download needed. It works on iPhone, Android, iPad, and any device with a modern browser (Chrome, Safari, Firefox, Edge, Samsung Internet).
- What's the difference between download speed and upload speed?: Download speed measures how fast you receive data (loading websites, streaming video, downloading files). Upload speed measures how fast you send data (video calls, uploading to cloud storage, live streaming). Most ISPs provide faster download than upload speeds.
- How often should I run an internet speed test?: Run speed tests weekly to track your connection quality over time. Test at different times of day to identify peak-hour throttling. Always test after changing routers, upgrading your plan, or contacting your ISP about slow speeds.
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