Serial Communication Tool - Web Serial

Browser-based serial terminal using Web Serial API. Connect to COM ports, send/receive HEX/ASCII, run macros, log to TXT/JSON/CSV.

A modern, browser-based alternative to Tera Term and PuTTY. Built on the Web Serial API — no installation required. Send, receive, and log serial data directly in Chrome. USE CASES • Embedded development debugging (Arduino, ESP32, STM32, Raspberry Pi Pico) • Industrial equipment configuration (RS-232C, RS-485 via adapter) • IoT device communication • Modbus, AT commands, custom protocols KEY FEATURES • Serial Configuration — Baud rate, data bits, parity, stop bits, flow control, RTS/DTR signal control • Send/Receive Log — Timestamped logs with export (TXT/JSON/CSV), filtering, auto-save on disconnect • Send History — Press ↑/↓ to recall past commands (up to 50) • Quick Commands — One-click sending of frequent commands with drag & drop reordering • Macro Automation — SEND/WAIT/RETRY syntax for automated sequences with response timeout • Regex Alerts — Pattern-based alerts with audio notification • RX/TX Rate Display — Real-time bandwidth monitoring • Response Time Monitor — Latency measurement for command-response cycles • HEX Binary Send — Send arbitrary binary data via hex notation • Profile Management — Save and share connection profiles (import/export) • Multilingual — Japanese, English, Chinese, Korean, German, French, Spanish, Portuguese PERMISSIONS: Only "storage" — no network access whatsoever.