Bandwidth Test
Use the free test below to measure your connection right now. It adapts to your speed and finishes in under a minute.
What happens when you run it
Because the download is split into several measured passes, a single slow moment or network hiccup can be discarded instead of silently dragging the whole result down.
This test starts with a short latency probe, then downloads test data from Cloudflare's edge in increasing amounts until it can estimate your connection confidently. Slow links stop early; gigabit links scale up to get a stable reading.
A connection that measures 50 Mbps needs far less data to confirm that number than a 900 Mbps fiber line needs, and this test sizes the transfer accordingly.
How to read your result
A higher download number means quicker page loads and smooth 4K streaming; upload matters for video calls, backups and large file sends.
Ping is measured over many small round trips, and the result you see is the median of all of them, so an occasional slow packet does not distort the reading.
What moves the needle
A test reaches a steady state only after TCP congestion control ramps up, which is why very short downloads can under-report fast connections — this test's ladder avoids that by using progressively larger payloads.
This service measures the path to Cloudflare's edge, which is close to how your ISP peers with the broader internet — a fair general baseline.
Making the result useful
The result screen labels the server you measured against, so you always know exactly what path a number represents before you compare it with anything else.
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.
Making the result useful
Bandwidth 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
This test measures throughput to Cloudflare's edge, not to every service you use. Remote work, gaming or streaming servers may route differently and show different performance.
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.
Related tests & guides
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