Check VPN behavior on a hotspot before uploading

You are about to send a large folder to cloud storage over a phone hotspot. Before the upload begins, you want to know whether the VPN still protects the browser after connecting to the hotspot, or whether your real network address becomes visible.

The VPN Leak Test checks whether your real IP address is exposed through IPv6 or WebRTC while the VPN is on. It can help you check the browser's current connection, but it cannot prove that every app on your computer uses the VPN or that the upload will finish without interruption.

Check the VPN on your hotspot

1. Connect your laptop or tablet to your phone's hotspot. Wait until websites load normally, then connect the VPN.
2. Open the VPN Leak Test in the same browser you plan to use for the upload. If your VPN provider offers a browser extension, make sure it is enabled in this browser.
3. Read the displayed IP and leak findings. Compare the public address shown with the VPN disconnected and connected, using the same hotspot. A connected VPN should normally show its exit address rather than the hotspot provider's internet address.
4. Switch the VPN off, then on again, and repeat the check. If you plan to reconnect to the hotspot during the upload, test again after that network change too.
5. Before uploading, confirm that the VPN says it is connected and that your cloud storage app or website is working. If the upload is important, start with a small test file and watch for pauses or errors.

Hotspot networks can change as the phone switches between cellular conditions or as your laptop disconnects and reconnects. A VPN may briefly reconnect during those changes. Testing only before joining the hotspot can miss a problem that appears after the network changes.

What the result means

The public address changes when the VPN connects, with no leak reported

This is a reassuring result for the browser at that moment. The browser is using an address associated with the VPN connection, and the test did not detect the checked IPv6 or WebRTC leak paths. It is not proof that other apps use the VPN, or that the VPN will stay connected throughout a long upload.

The address stays the same with the VPN on

The browser may not be routed through the VPN. Check whether the VPN is actually connected, whether a browser extension is paused, or whether the VPN is configured to exclude this browser. Some services can use different exit addresses over time, so compare the result with your VPN provider's expected behavior rather than relying only on an address you saw earlier.

The test identifies a possible IPv6 or WebRTC leak

The browser may be revealing an address outside the VPN route through one of those paths. This does not automatically mean your cloud upload is exposed in the same way, because the test checks browser behavior, not the upload app. Still, pause a sensitive upload until you have checked the VPN settings and tested again.

The test shows a local or private address

A local network address, often beginning with 192.168, 10, or 172.16 to 172.31, is not the same as your public internet address. WebRTC can reveal local network details without exposing your public address. Focus on whether the test reports a public address outside the VPN, and review the finding in context.

The VPN disconnects or the test will not load

This points to a connection or browser issue, not necessarily an IP leak. The hotspot may be dropping data, the VPN may be reconnecting, or the network may block a required connection. Reconnect the VPN, wait for it to show connected, and repeat the check.

How to fix it

1. Reconnect the VPN after joining the hotspot. Turn the VPN off and back on once the laptop has joined the phone's network. Wait for its connected status before testing again.
2. Check that the VPN covers the app you will use. A browser extension usually protects traffic in that browser, not a separate desktop sync program. If the upload uses an installed app, use a device-wide VPN connection or check the provider's documentation for app coverage.
3. Review split tunneling and exclusions. Split tunneling lets selected apps bypass the VPN. Remove the browser or upload app from any bypass list if you want its traffic routed through the tunnel. The name and location of this setting vary by VPN provider.
4. Check the VPN connection settings. In Windows 11, open Settings › Network & internet › VPN to review a built-in VPN connection. On macOS, open System Settings › VPN to review the VPN connection. If you use a separate VPN app, check its connection and routing settings there instead.
5. Check the phone's hotspot connection. Keep the phone in a place with a stable cellular signal, leave hotspot sharing enabled, and prevent the phone from entering a power-saving state that stops sharing. On iPhone, look under Settings › Personal Hotspot. On Android, look under Settings › Network & internet › Hotspot & tethering, though labels vary by model.
6. Test again after changing one setting. Reopen the leak test, reconnect the VPN, and check the result on the hotspot. Changing one thing at a time helps show which adjustment mattered.

A leak check is not an upload test

The VPN Leak Test checks browser-visible IP behavior. It does not measure hotspot speed, prove that a cloud sync app follows the same route, or detect every possible privacy issue. A clean result is a useful checkpoint, not a guarantee that the connection will remain private and stable for hours.

For a large transfer, keep the phone and computer where the hotspot connection is steady, and avoid switching networks while the upload is running. If the VPN drops, pause the transfer until it reconnects and you can confirm the browser's connection again.

The test checks network information visible to the browser, not the files on your device or the contents of your cloud account.