Free browser-based tools for serial communication, ESP and STM32 flashing, SPI flash programming, AVR programming and logic analysis. Connect compatible hardware directly from your browser to inspect, program and debug embedded devices without installing a desktop toolchain.
Web Serial
Connect to ESP32, Arduino, ARM boards, Bus Pirate firmware, USB-UART adapters and CDC-ACM serial devices directly from Chrome, Firefox or Edge. Read logs, send commands, paste scripts, save serial sessions locally.
Open Web Serial TerminalSPI Flash
Browser-based flashrom workflow for probing, reading, writing, and saving SPI NOR flash chips through serprog-compatible hardware, enabling firmware extraction directly from a web browser.
Open SPI Flash ProgrammerSUMP Logic
Capture digital signals from SUMP-compatible hardware, inspect GPIO waveforms in the browser and export VCD, CSV, raw binary or session JSON data for protocol debugging and reproducible analysis.
Open Web Logic AnalyzerESP Tool
Flash ESP firmware parts, read backups, merge binaries offline and erase chips from a desktop-style browser tool. Supports common ESP32 layouts, custom offsets, validation, all in your web browser.
Open Web ESP ToolSTM32 ST-LINK
Identify STM32 targets, flash BIN or Intel HEX firmware, back up memory, erase pages or sectors and switch to a serial console through the built-in ROM UART bootloader or ST-Link adapter.
Open STM32 Web ToolAVR ISP
Prototype AVR ISP workflows in the browser with the ESP32 Bit Pirate AVRDUDE adapter. Detect ATmega and ATtiny targets, read memory, write HEX files with the Bus Pirate driver.
Open Web AVR ProgrammerThese browser tools are built for ESP32 Bit Pirate workflows, but they also work with other hardware that exposes the same open interfaces and protocol adapters.
Web Serial works in Chrome, Firefox, Edge, Opera and compatible Chromium browsers on desktop. Safari does not currently support Web Serial hardware access.
The operating system must recognize your ESP32 board, USB UART adapter, CDC-ACM device or ESP32 Bit Pirate USB mode before the browser can request access.
If serial access fails on Linux, grant your user access to the device with sudo setfacl -m u:$USER:rw /dev/ttyACM0, then reconnect the board.
Serial logs, flash data and logic analyzer captures are processed locally by these static pages. The application does not upload captures to a server.
ESP32 Bit Pirate is an open-source firmware that turns compatible ESP32-S3 devices into a multi-protocol hardware hacking and debugging tool inspired by the Bus Pirate.
It supports serial and web command-line workflows for UART, I2C, SPI, 1-Wire, 2-Wire, 3-Wire, CAN, JTAG/SWD, infrared, Wi-Fi, Bluetooth, Sub-GHz, RFID, RF24, FM and USB adapter modes.
These web tools strengthen the ESP32 Bit Pirate ecosystem by making common embedded workflows discoverable from a secure browser page: serial console access, firmware memory work, digital logic capture and protocol investigation.
The same hardware can switch between protocol mode and adapter-style workflows, so you can move from probing a bus to capturing waveforms, reading memory or programming without changing tools.
Use the same command structure over USB serial, Wi-Fi web interface or browser-based Web Serial workflows.
Scan, sniff, send, script, dump, explore wired and wireless protocols.
Work with EEPROM, flash, smartcard, SIM, iButton, RFID tag, firmware dumps.
Useful companion projects for extending hardware and automating ESP32 Bit Pirate workflows.
These tools build on open browser APIs and open-source projects that make this possible.
