Internet Speed Test

Your browser downloads and uploads blocks of random data to and from the nearest Cloudflare test server, and times how long each one takes. It starts with small blocks and only moves to bigger ones if your connection is fast, so the result is accurate without wasting data. It uses Cloudflare's open-source speed test engine.

Download speed is how fast data reaches you, which matters for streaming, browsing and downloads. Upload speed is how fast you send data, which matters for video calls, sending big files and cloud backups. Ping (latency) is how long a tiny message takes to go to the server and back, in milliseconds. Jitter is how much the ping changes from one moment to the next. For ping and jitter, lower is better.

It depends on what you do and how many people share the connection. Netflix recommends 5 Mbps for 1080p HD and 15 Mbps for 4K on one screen. In the US, the FCC counts 100 Mbps download and 20 Mbps upload as its benchmark for high-speed fixed broadband. A home with several people streaming and on video calls at the same time needs more than one person browsing.

The test also measures ping while it is downloading and uploading. If ping rises a lot under load, your router is holding data in a queue (often called bufferbloat). That is why a game or video call can lag when someone else in the house starts a big download, even if your speed looks fine.

Plans usually say "up to" a speed, measured to your router with a cable. Wi-Fi, distance from the router, walls, older phones and laptops, other devices using the connection, VPNs and busy evening hours can all lower the result. Test once with a cable plugged into the router to see what the line itself delivers.

No. Speed tests show megabits per second (Mbps). Files are measured in megabytes (MB), and 1 byte is 8 bits. So 100 Mbps downloads at most about 12.5 MB per second.

It depends on your speed, because faster connections need bigger blocks to measure well. A slow connection uses a few megabytes. A very fast connection can use a few hundred megabytes. The exact amount is shown after each test, so take care on a limited mobile data plan.

The test sends only random test data, never your files. To measure your speed, your browser connects to Cloudflare's speed test servers, so Cloudflare sees your IP address, as any website you visit does. We turned off the option that sends your results to Cloudflare. Your last five results are saved only in your own browser, and you can clear them at any time. Get Into Tools does not receive your results.

Some ad blockers, firewalls and school or work networks block speed test servers. If the test cannot reach speed.cloudflare.com, it shows an error. Try again on another network, or pause the blocker for this page.