Web Serial Monitor

What this tool does:

Displays live Serial.print() output from USB‑serial devices (ESP32, Arduino, RP2040, etc.) using your browser’s Web Serial API.

Your device must appear as a USB serial / COM port.

Browser support:

  • ✅ Chrome
  • ✅ Microsoft Edge
  • ❌ Firefox (not supported)
  • ❌ Safari (not supported)

Please switch to Chrome or Edge if you are using Firefox or Safari.

If you see no output:

  • Ensure the baud rate matches Serial.begin() in firmware
  • Click Connect after the device finishes booting
  • Press the device RESET / EN button after connecting
  • Close Arduino Serial Monitor or other apps using the port