ESP32 Web Flasher - Free Online IT Tool

⚡ ESP32 Web Flasher

Flash multiple firmware (.bin) files to ESP32 series microcontrollers with custom offsets directly from your browser. Privacy-First: Client-Side

Flashing Baud Rate

Erase Flash First?

Initial Offset

Initial Firmware (.bin)

ℹ️ About ESP32 Web Flasher

The ESP32 Web Flasher is a professional-grade utility that leverages the Web Serial API and the official Espressif esptool-js library. It allows you to upload multiple compiled firmware (.bin files) to specific memory offsets (like bootloader, partition table, and app) without any local software installation.

Features:

Multi-File Support: Add as many file/offset pairs as needed for complex partition layouts.
Auto-Detection: Automatically identifies the connected ESP32 variant (ESP32, S2, S3, C3, etc.).
High Speed: Supports flashing speeds up to 921,600 baud.
Privacy-First: Your firmware files are processed entirely in your browser; nothing is uploaded.

Note: Requires a Chromium-based browser (Chrome, Edge, Opera).

📖 How to use ESP32 Web Flasher

1. Select your Flashing Baud Rate (460800 is recommended).
2. Choose if you want to perform a Full Erase before flashing.
3. Click 'Run Tool' to open the Flash Manager dashboard.
4. In the dashboard, set the <strong>Offset</strong> (e.g., <code>0x1000</code>) and upload your <code>.bin</code> file.
5. Use <strong>+ Add File</strong> to include additional binaries (e.g., bootloader at 0x1000, app at 0x10000).
6. Click 'Connect & Flash' to start the process.