Web Serial Port Test
Useful for Arduino, ESP32, USB-to-serial adapters, 3D printers, and other serial-capable hardware in supported browsers.
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.
What happened?Choose the result you observed.
Privacy: DeviceOK opens only the port you choose and closes it after the test.
What this test tells you
This test checks
- Web Serial support
- Port selection
- Open/close access
How to read the result
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.