Test your connection, identify common faults and follow practical fixes. Free, private and no account required.
Run complete testExplore diagnosticsRun several tests at different times for a representative result.
A speed number is only a starting point. The same symptom can come from the device, Wi-Fi, local traffic, broadband line, provider route, DNS or the service itself. Use controlled comparisons to find the boundary where performance changes.
Pause large transfers and run three tests on the same device. Note the time, room, connection type and whether a VPN is active. The browser test uses real HTTPS transfers and measures the complete path to LumaProbe, not only the provider line.
Compare beside the router with the problem room, then Wi-Fi with Ethernet where possible. If wired performance is healthy but a room is poor, investigate coverage. If every device is poor on both, check official provider information and the access connection.
Upload affects calls and backups; latency affects responsiveness; jitter shows variation. Failed requests are unsuccessful HTTPS samples, not a formal ICMP packet-loss percentage. Repetition matters more than one unusually good or bad run.
LumaProbe requires no account, stores public test history only in your browser, publishes its implemented method and links to official provider checkers instead of inventing live outage claims.
Checks run only when you request them and explain what each result means.
See your public IP, HTTPS status and browser-reported connection type.
Learn more →Confirm that a domain resolves and compare lookup time.
Learn more →Check a public website HTTP response without opening it.
Learn more →Inspect online state, cookies, local storage and connection API support.
Speed test →Follow a short decision tree and receive targeted next steps.
Start troubleshooter →Review speed tests saved privately in this browser and export them as CSV.
Learn more →We link to verified provider pages and never invent outage reports.
A controlled way to separate broadband, coverage, interference and device problems before changing equipment.
Read guide →Buying guideChoose a router, access point or mesh system from diagnosed coverage, port and support needs—not headline speed.
Read guide →NetworkingA practical guide to Cat 5e, Cat 6, link speeds, switches, adapters and wired backhaul for home networks.
Read guide →GamingDiagnose local Wi-Fi, busy-line queueing and route problems without chasing misleading “gaming speed” claims.
Read guide →ReliabilityImprove calls and remote access, separate work and home faults, and prepare a realistic fallback before an important meeting.
Read guide →UK consumer guideUnderstand contract speed information, document a persistent fault and use the provider complaint and ADR process under current UK rules.
Read guide →Some links may earn us a commission at no extra cost to you. Recommendations are categories, not paid rankings.
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