How WifiMapper works
You do not need an account to map WiFi. Install the Android app, walk around, and the app scans, stores and maps everything on the phone itself. Scanning and the map are both fully local - no sign-up, no email address, nothing leaves the device. An account only comes into it if you later want those samples kept in the cloud and drawn on the bigger web map.
Map your local area, on the phone
Install the app and start a scan
Download WifiMapper for Android, set how often you want it to sample (five seconds is a good starting point) and press Start. The app asks Android for every WiFi network in range and pairs each reading with your GPS position, over and over as you move, so a walk through a building or around a block turns into a trail of measured points. It never joins the networks it maps - it only listens to what they broadcast - so it needs no WiFi passwords and changes nothing on the networks themselves.
View the map on your phone
Press Stop, then View Map. Every point you scanned from is drawn on the map right there on the device. Pick an SSID and its samples appear sized by signal strength, so the cluster of biggest dots shows you roughly where that access point sits. This is the whole WiFi mapping workflow, and it happens entirely offline.
Keep mapping - your samples add up
Samples are saved on the phone and survive closing the app, so sessions accumulate into one growing local WiFi map. Map a room today and the rest of the floor next week, and the map keeps both. Clear Data wipes the device's stored samples whenever you want a fresh start.
That is everything most people need: map your local area, see where the signal reaches, find the access point, and never hand over an email address to do it.
Optional: keep your samples in the cloud
Create a free account only if you want more than the phone can give you - samples stored off the device so they survive losing or replacing the phone, a full-size map in a browser, and a history you can come back to and compare. Everything above keeps working exactly the same whether you do this or not.
Create an account
Sign up on the web with an email address and a password. The free plan covers your first 100 access points and needs no card.
Enter it in the app and upload
Put the same email and password into the app's upload settings, then press Upload Data. Your stored samples go to your account, each carrying the SSID, the access point's BSSID, the channel frequency, the signal strength, the security protocol, the GPS position and the time. Until you press Upload, nothing has left the phone. If you would rather only ever upload from home, name your home network in the app and uploads are refused anywhere else.
Map WiFi signal strength on the web
Sign in at wifimapper.online and open the map. Same idea as the phone map, on a screen big enough to read: every scan point as a blue dot, and any SSID you pick drawn as red dots sized by signal strength. Your history stays in your account, so you can map a site again after moving an access point or changing a channel and put the two WiFi maps side by side.
What you need
- An Android phone with WiFi and GPS - that is the whole hardware list.
- Location permission, because a WiFi map without positions is just a list.
- No account, unless you want your samples in the cloud and on the web map.
- Any browser, if you do.
Ready to map some WiFi?
Start with the app and map your own area - no sign-up needed. Come back and create a free account whenever you want that data kept somewhere other than the phone.