AltF NetCheck
WiFi Speed Test
This WiFi speed test measures the download and upload speed, ping and jitter you actually get over your wireless connection, from the room you are in. Run it next to the router and again in other rooms: the drop between them is your Wi-Fi coverage, and the gap to a wired test is what your Wi-Fi costs you. Every run is saved so you can compare rooms.
- Free, no sign-up
- Cloudflare global network
- Ping, jitter and bufferbloat
- History stays on your device
Run the internet speed test
-Mbps
-Mbps
-ms
Idle round-trip time
-ms
Ping variation
-ms
Measured during download and upload
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Grade A+ to F
Your connection
Run a test to see your ISP, public IP (masked by default), approximate location and the server you were tested against.
The test talks to Cloudflare's speed-test servers, which see your IP address like any website does. AltFTool does not store your results; history stays in this browser.
Your speed history
Every test you run is saved here, in this browser only, so you can compare times of day, rooms or Wi-Fi vs cable. Nothing is uploaded.
How to test Wi-Fi properly
- Run one test on an Ethernet cable (or right next to the router) as your baseline.
- Run a test in each room you use, holding the device as you normally would.
- Note which band you are on: 5 GHz is faster near the router, 2.4 GHz reaches further.
- Compare the runs in your history below. More than about a 50% drop in a room means it needs a mesh node or access point.
What slows Wi-Fi down
- Distance and walls, especially brick, concrete, metal and mirrors.
- Crowded channels from neighbouring networks, common in apartments.
- Old devices or routers (Wi-Fi 4 / 802.11n) that cap speed for everyone on the network.
- Microwaves, baby monitors and Bluetooth on the 2.4 GHz band.
- Too many active devices sharing the same airtime.
Is it my Wi-Fi or my ISP?
If a wired test (or one beside the router) is close to your plan speed but other rooms are slow, the issue is Wi-Fi coverage and a better router position, mesh system or access point will help. If even the wired test is well below your plan at off-peak times, the issue is the line or the ISP.
WiFi Speed Test FAQ
What is a good WiFi speed?
Near the router you should get most of your plan speed on 5 GHz. In far rooms, 25 Mbps or more is enough for 4K streaming, and ping under 50 ms with low jitter keeps calls and games smooth.
Why is my WiFi slower than my plan?
Wi-Fi loses speed with distance, walls, interference and older devices. Many phones and laptops also cannot reach gigabit speeds over Wi-Fi even when the line can.
Should I use 2.4 GHz or 5 GHz?
Use 5 GHz (or 6 GHz on Wi-Fi 6E/7) when you are reasonably close to the router for higher speed and less interference. Use 2.4 GHz only where 5 GHz cannot reach.
Want the complete picture? The main page explains every result, how much speed each activity needs, why tests read lower than your plan and how NetCheck measures.
Internet speed test guideAltFTool stores no results and no IP addresses. Tests run against Cloudflare's speed-test servers; your history is kept in this browser only.