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See your public IP, IP version, HTTPS status and browser-reported connection type.
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Your connection, made clearer.
Check your speed. Understand the delays. Find your next step.
Explore all diagnosticsReady to testTest server: United Kingdom
Distance to the UK server can raise latency outside nearby regions.Uses about 24 MiB (25 MB) per completed test.
Test label (optional)
For example: Office Wi-Fi or Living room. Saved only in this browser.
Internet speed-test results
—Mbps Download
—Mbps Upload
—ms Idle latency
—ms Download-loaded latency
—ms Upload-loaded latency
—ms Jitter
—Failed requests
Run several tests at different times for a representative result.
What this result may support
Web browsing—
HD streaming—
4K streaming—
HD video calls—
Online gaming—
These are approximate single-device estimates, not guarantees. Other users, applications, routes and service requirements can change the experience. How the estimates are interpreted →
—Responsiveness under load
Saved tests and comparisons
Choose up to three saved tests. Keep the device and test conditions consistent, or change one thing at a time.
Labels and results stay in this browser. Clearing browser data removes them. A complete test uses about 24 MiB (25 MB); opening this panel runs no tests.
Use your browser's print dialog to print or save as PDF. Only the selected results are included.
PRACTICAL HELP
What would you like to check?
Start with the symptom, then explore the details.
DIAGNOSTIC TOOLKIT
Connection diagnostics
Choose a check to see what it measures and how to interpret the result.
DNS resolution
Confirm that a domain resolves and compare lookup time.
Learn more →Website response
Check a public website HTTP response without opening it.
Learn more →Browser capabilities
Inspect online state, cookies, local storage and connection API support.
Speed test →Wi-Fi troubleshooter
Follow a short decision tree and receive targeted next steps.
Start troubleshooter →Result history
Review speed tests saved privately in this browser and export them as CSV.
Learn more →Turn one result into a useful diagnosis
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.
Test under known conditions
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.
Change one part of the path
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.
Interpret more than download
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 needs no account and saves speed-test history in this browser. Read how the tests work and use providers' official status pages for current outage information.
A speed test is more than one number
Download capacity matters for large transfers and streams, but upload, idle latency, loaded latency, jitter and consistency often explain calls, games and “fast but laggy” connections better.
Idle versus loaded latency
Compare idle latency with latency during download and during upload, measured separately. Smaller increases are better.
Compare controlled tests
Use the same device and connection type, pause avoidable traffic and repeat at different times. Compare Wi-Fi beside the router, the problem room and Ethernet before blaming the package.
Worldwide test, UK server
Anyone can run LumaProbe, but the current test node is in the United Kingdom. Long-distance routes can add latency or limit throughput, so distant visitors should focus on repeatable comparisons.
VERIFIED LINKS
Official service status
Open the provider's official status page for current information.
PRACTICAL HELP
View all guides →Guides
Wi-Fi diagnosis
How to fix slow Wi-Fi without guessing
A controlled way to separate broadband, coverage, interference and device problems before changing equipment.
Read guide →Buying guideRouter and mesh Wi-Fi buying guide
Choose a router, access point or mesh system from diagnosed coverage, port and support needs—not headline speed.
Read guide →NetworkingEthernet cables and network switches explained
A practical guide to Cat 5e, Cat 6, link speeds, switches, adapters and wired backhaul for home networks.
Read guide →GamingHow to reduce gaming ping, jitter and connection drops
Diagnose local Wi-Fi, busy-line queueing and route problems without chasing misleading “gaming speed” claims.
Read guide →ReliabilityBuild a reliable work-from-home connection
Improve calls and remote access, separate work and home faults, and prepare a realistic fallback before an important meeting.
Read guide →UK consumer guideUK broadband speeds, evidence and provider complaints
Understand contract speed information, document a persistent fault and use the provider complaint and ADR process under current UK rules.
Read guide →DIAGNOSE BEFORE BUYING
Equipment that may help
Some links may earn us a commission at no extra cost to you. Recommendations are categories, not paid rankings.
Affiliate disclosureMesh Wi-Fi systemsFor persistent weak coverage across several roomsSee options →Cat 6 Ethernet cablesFor the most stable connection to fixed devicesSee options →Gigabit Ethernet switchesFor adding wired ports without replacing your routerSee options →USB Ethernet adaptersFor laptops without a network socketSee options →