MicroPython Web IDE

About this tool

This is a browser-based IDE for boards that run a Python interpreter on-device — MicroPython (ESP32, Raspberry Pi Pico, micro:bit, and more) and CircuitPython (Adafruit boards). Because the interpreter already lives on the board, your .py files run directly with no compile step: the classic limitation that a browser can't build C/C++ firmware simply doesn't apply here. Connect over the Web Serial API, and the code editor, REPL terminal and file manager all talk to the board locally — nothing is uploaded to a server.

How it works

The tool speaks MicroPython's raw REPL protocol. When you press Run, it interrupts whatever is executing, switches the board into raw REPL, streams your code over raw-paste mode (window flow-controlled, so a large script transfers cleanly without the friendly REPL's auto-indent mangling it), runs it, and pipes the output straight back to the terminal. Ctrl-C interrupts a running program; Ctrl-D triggers a soft reset. On-device filesystem operations — list, read, write, delete — are performed by running small Python snippets over the same channel and parsing what the board prints.

Files and autorun

The file manager lists what's on the board and lets you edit, upload, download and delete files. Save an editor tab as main.py (or code.py on CircuitPython) and the board runs it automatically on the next reset — the whole point of these boards. CircuitPython note: when your computer has the CIRCUITPY USB drive mounted writable, the board mounts its own filesystem read-only, so writes from the web fail until you eject the drive; the tool detects the flavor and explains this.

Examples and snippets

A starter library covers the usual first steps — blink an LED, read an analog sensor, connect to Wi-Fi, stream numbers to the live plotter — loadable in one click. Snippets you write yourself are saved in your browser's localStorage and never leave the device.