Espressif ESP32/ESP8266 Online Flasher

If you have a Chromium-based web browser it's often possible to flash your ESP32 device direct from the web browser...

• Click one of the links below to install the relevant firmware.
• Choose the communications port for your ESP8266/ESP32 device from the list
• In the next window, click Install Firmware
• Click Install in the next window to confirm
• If the window stays with a spinning progress indicator but nothing happens for 10 seconds, you may need to put your ESP32 into bootloader mode first by holding BOOT while tapping RESET/EN button.
• Once complete, you can connect with the Web IDE (ensure Baud Rate in Settings -> Communications is set to 115200)

NOTE: The ESP8266 build provided here is for 512k boards, but works on 4MB boards too. To make the most of a 4MB board check out the ESP8266 page