Speedtest
FreeOokla's bandwidth test — measure download, upload, ping and jitter against thousands of nearby servers in seconds, with a results history when you sign in. The reference tool ISPs themselves cite.
Why we recommend Speedtest
'Speed test' pulls over 50 million searches a month and Ookla's Speedtest is the brand that defined the category — its server network is so dense (thousands of test points worldwide) that results are accepted as evidence in arguments with your ISP, which is what most tests are really for. It measures ping and jitter alongside raw throughput, which matters for calls and gaming. Is it free? Yes — the test is free and unlimited, ad-supported; results history just needs a free account.
Best use cases
How to use it: open speedtest.net and press Go — no account, no install, results in about thirty seconds. Test wired vs Wi-Fi from the same spot to isolate router problems, and run it at different hours to document evening congestion before calling your provider. Netflix's fast.com is the minimalist alternative; Speedtest is the one with server choice and history.
Honest limitations
Does it work offline? By definition, no — it exists to measure your connection, so there is nothing to use without one (the web page itself won't load). The website carries noticeable ads (the desktop apps are cleaner), a nearby test server can flatter your ISP's routing, and browser tests can under-read multi-gigabit fibre where the native apps measure more accurately.
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