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espressif/esptool · source

Snapshot 0 · 2026-11-04T12:47:23Z · Python · GPL-2.0

GitHub description at capture

Serial utility for flashing, provisioning, and interacting with Espressif SoCs

README at capture

# esptool

A Python-based, open-source, platform-independent serial utility for flashing, provisioning, and interacting with Espressif SoCs.

[![Test esptool](https://github.com/espressif/esptool/actions/workflows/test_esptool.yml/badge.svg?branch=master)](https://github.com/espressif/esptool/actions/workflows/test_esptool.yml) [![Build esptool](https://github.com/espressif/esptool/actions/workflows/build_esptool.yml/badge.svg?branch=master)](https://github.com/espressif/esptool/actions/workflows/build_esptool.yml)
[![pre-commit.ci status](https://results.pre-commit.ci/badge/github/espressif/esptool/master.svg)](https://results.pre-commit.ci/latest/github/espressif/esptool/master)

## Documentation

Visit the [documentation](https://docs.espressif.com/projects/esptool/) or run `esptool -h`.

## Flasher Stub

esptool uploads a small [flasher stub](https://docs.espressif.com/projects/esptool/en/latest/esptool/flasher-stub.html) program to the chip to improve flashing performance and work around ROM bootloader limitations. The stub is developed in the [esp-flasher-stub](https://github.com/espressif/esp-flasher-stub) repository. Prebuilt binaries are bundled with esptool releases.

## Contribute

If you're interested in contributing to esptool, please check the [contributions guide](https://docs.espressif.com/projects/esptool/en/latest/contributing.html).

## About

esptool was initially created by Fredrik Ahlberg (@[themadinventor](https://github.com/themadinventor/)), and later maintained by Angus Gratton (@[projectgus](https://github.com/projectgus/)). It is now supported by Espressif Systems. It has also received improvements from many members of the community.

## License

This document and the attached source code are released as Free Software under GNU General Public License Version 2 or later. See the accompanying [LICENSE file](https://github.com/espressif/esptool/blob/master/LICENSE) for a copy.