Find which app is using your internet on Windows
Use Task Manager, Resource Monitor and Windows data usage settings to find which app is using your bandwidth, and see live speed while you do it.
When your connection feels slow or your data allowance disappears, the quickest fix is to find the app responsible. Windows has several built-in tools for this. Each answers a slightly different question.
Task Manager: who is busy right now
- Press Ctrl+Shift+Esc to open Task Manager.
- On the Processes tab, look at the Network column.
- Click the column header to sort by the biggest user.
This gives a quick snapshot of which apps are transferring data at this moment. It shows a percentage of your adapter’s capacity rather than a speed in MB/s, so it is best for spotting the heaviest user.
Resource Monitor: send and receive per process
- Press Windows key + R, type
resmon, and press Enter. - Open the Network tab.
- Expand Processes with Network Activity to see send and receive rates per process.
Resource Monitor shows bytes per second and lets you see which remote addresses an app is talking to. It is the most detailed built-in view for live activity.
Windows data usage: totals over time
On Windows 10 and Windows 11, open Settings, then Network & internet, then Data usage. Windows lists how much data each app has used over the last 30 days. This is useful for finding apps that use data in the background, and for setting a data limit on a metered connection. See how to monitor data usage on Windows.
Common culprits
- Windows Update and Microsoft Store updates
- Game launchers downloading patches
- Cloud storage and backup apps uploading files
- Browser tabs playing video or syncing
- Other devices on the same Wi-Fi, which these tools cannot show
Keep a live readout in view
Task Manager and Resource Monitor need to be opened and read. A compact floating window or taskbar readout keeps your download and upload speed visible, so you notice a sudden spike straight away and can then open Resource Monitor to find the cause. That is the idea behind network usage monitoring and measuring network activity during downloads.
If the numbers look wrong, make sure the right adapter is selected. See Windows network adapters explained.
Related pages
How to monitor data usage on Windows
Find per-app data usage and keep track over time.
Network usage monitoring
Track how much data your PC uses over days and weeks.
Measuring network activity during downloads
Use live speed to judge whether a download is healthy.
Published 2026-10-16