On Windows, open Settings > System > About and check System type
On Windows, press Win + Pause/Break and look for System type
On Windows, open Control Panel > System and Security > System and check System type
On Windows, open Command Prompt and run: wmic os get osarchitecture
On Windows, open System Information and check System Type
On macOS, click the Apple menu > About This Mac
On Linux, open Terminal and run: uname -m
On Linux, open Terminal and run: getconf LONG_BIT
On Android, check device specifications in Settings or the manufacturer’s website
On iPhone or iPad, check the device model on Apple’s website to determine architecture