hardware test
Web Serial Port Test
Useful for Arduino, ESP32, USB-to-serial adapters, 3D printers, and other serial-capable hardware in supported browsers.
No accountLocal where possibleRetest anytime
Advanced hardware access
This advanced test only works in browsers that expose the required hardware API.
DeviceOK requests access only after you click. Advanced browser hardware APIs are permission-gated and are not universally supported.
Private by design
DeviceOK opens only the port you choose and closes it after the test.
Use the result as evidence, not a guess.
This test checks
- Web Serial support
- Port selection
- Open/close access
How to read it
Opening the port confirms browser access at the selected baud rate.
It does not prove the attached device understands a particular protocol or command set.