Modem Speed Test
Click start and the adaptive engine measures ping, download and upload in under a minute — with no account and no app.
What happens when you run it
Instead of forcing one fixed download on everyone, the tool adapts: it sends progressively larger payloads and stops the moment the estimate stabilizes.
Each pass of the measurement reads the payload directly from Cloudflare's edge and times how long the transfer actually takes, so the growing ladder reflects your real throughput rather than a guess.
The adaptive ladder is why this test is both quick on slow links and accurate on fiber — it gives each connection exactly the data it needs.
How to read your result
Download is how fast data travels to you — it drives streaming, browsing and game downloads. Upload is the reverse and matters for backups, video calls and cloud work.
Latency is the round-trip time to our test server — small numbers are better for gaming and calls. Jitter measures the variation, and high jitter is what makes calls sound robotic even at low ping.
What moves the needle
Your measured speed can vary with the time of day, the device's Wi-Fi generation, and how many other people are using the connection.
No single test can represent every destination on the internet, but a path to a major edge network is the standard, neutral way to benchmark a connection.
Making the result useful
Run the test a few times over a few days before drawing conclusions. One-off speeds are noisy; a median of several runs is a much more reliable picture of your connection.
Your data stays in your browser for the duration of the test; only a small, anonymous summary is saved afterward, and never the raw payload.
This test is free, requires no account, and never shows ads while it runs — the only goal of the measurement is to give you a trustworthy number as quickly as possible.
A few final tips
Modem Speed Test is built to run on your connection in under a minute — press start, read the four numbers, and compare them with what your plan promises.
Speed test limitations
A speed test measures your connection to our test server, which typically lives on the same backbone your ISP peers with. Speeds to other destinations can vary with routing, server load, and the websites you use.
Latency shown here is the round-trip time to the test server, not the latency you would get to every gaming server or streaming CDN. Use it as a general baseline, not a guarantee.
Related tests & guides
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