A Python-based, open-source, platform-independent utility to communicate with the ROM bootloader in Espressif chips.

Test esptool Build esptool


Visit the documentation or run -h.


If you’re interested in contributing to, please check the contributions guide.

About was initially created by Fredrik Ahlberg (@themadinventor), and later maintained by Angus Gratton (@projectgus). It is now supported by Espressif Systems. It has also received improvements from many members of the community.


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 for a copy.