checkinternetspeed.tools is a free internet speed test that runs entirely in your browser. Type a URL, press a button, and see your download, upload, ping, and jitter — no app to install, no account to create, and no record of your results kept anywhere.

Most speed tests are built by companies that also sell something: a router, an ISP plan, a monitoring product. This one isn't. It does one job — tell you honestly what your connection is doing right now — and it tries to be transparent about how it gets the numbers and where they fall short.

How the measurement works

The test runs four measurements in sequence so each has the connection to itself. Ping and jitter come from a series of tiny round-trips to a one-byte file. Download streams incompressible data over several parallel connections and divides bytes by time. Upload sends random data your browser generates to a small server endpoint that counts the bytes and immediately discards them. Everything is timed on your device.

What it deliberately doesn't do

It doesn't claim laboratory precision on gigabit lines, it doesn't store your results, and it doesn't measure ICMP ping the way a terminal does — browser measurements use HTTP, which reads slightly higher. Those limits are spelled out plainly on the home page rather than hidden, because a speed number is only useful if you know what it does and doesn't represent.

Built and maintained by Murugan Vellaichamy, Software Engineer.