SerialTool is the most advanced software for serial port communication currently available on the market. Its ease of use, along with its features, makes it unique. This software is continually developed and updated, offering unparalleled stability and ease of use. Designed for intensive serial port logging, SerialTool is ideal for both occasional use and as a continuous monitoring and logging system for one or more serial ports.
SerialTool is dedicated to all developers who use the serial port daily for their projects, helping them with the most intensive debugging of their applications. SerialTool is not only a software for professionals but is also ideal for those approaching the world of electronics for the first time using Arduino or similar boards, where the first exercises are always based on serial port communication.
SerialTool is the only free software, for most of its functions, that allows you to manage multiple serial ports simultaneously without needing to launch multiple instances of the application. SerialTool is the only software that includes an editor for Python scripting and an integrated library to directly use the graphical interface of SerialTool. By writing your script in Python, you can directly display the data on the main screen of the application without having to develop your application. It is ideal for all professionals who want to deliver a professional software to their clients capable of running their Python program. Python scripting saves hours of developing proprietary software and avoids the complicated management of the graphical interface!
SerialTool provides a set of indispensable tools for developing embedded platforms and in the industrial field. In addition, SerialTool integrates a hex file editor to create and modify files freely.
SerialTool is cross-platform! It works correctly on 64-bit Windows, MacOS, and Linux operating systems. A single professional software that uses the same graphical interface and offers the same functionalities on all PC operating systems!
The graphical interface is intuitive and includes usage comments directly in the software, eliminating the need to read manuals or frantically search the internet to perform a specific function.
A Serial Port (COM Port) Software to communicate, monitor, sniff and debug serial ports.
SerialTool is more than a terminal, it works as a full Serial Port Assistant designed for development, debugging, and data transmission. It supports RS232, RS485, and UART interfaces and can communicate with devices such as sensors, controllers, CNC machines, DMX equipment, or GPS/GIS instruments.
It assists you to generate structured data packets, from simple byte sequences to a time based sends of data buffers.
Engineers and designers benefit from higher speed when building, debugging, and testing applications. SerialTool combines packet analysis, monitoring sessions, and automation tools so you can create hardware-software integrations more efficiently.
SerialTool allows you to open multiple serial ports at once and communicate simultaneously by sending and receiving data. Thanks to its versatility, it keeps the traffic of each serial port separate in its own session log, which lets you analyze every sent and received serial data packet.
You can view bits and bytes graphically with ByteVisualizer. Byte Visualizer displays the individual bits of a byte and simulates them on the serial port, highlighting the start bits, data bits, parity bits, and stop bits. Byte Visualizer is highly configurable and functions as a bit-byte converter, as if the serial port were connected to an oscilloscope.
SerialScope is a Serial Port Oscilloscope software that converts serial port data into graphical displays, similar to the Byte Visualizer. It simulates a software oscilloscope, allowing you to monitor data traffic on your serial port.
If you need to monitor a third-party application that already uses the serial port for reverse engineering, or debug your own serial software, SerialTool offers a powerful COM Sniffer.
COM Sniffer is a Serial Port Sniffer is a powerful tool designed to test, monitor, and analyze the data flow through your computer's COM ports. It allows you to simultaneously track communications for an unlimited number of ports in a single session, capturing all data in a structured, easy-to-read format. This dedicated solution is essential for developers and technicians for debugging COM-based applications and devices, offering a convenient way to read, filter, and save valuable data for detailed analysis.
SerialTool is a non-intrusive Serial Port Sniffer and Protocol Analyzer for RS-232, RS-422, and RS-485. With COM Sniffer you can capture, log, and export serial traffic to pcap for analysis in Wireshark.
If you want to learn how to log, monitor, and sniff a serial port, this tutorial is for you. It explains how to physically hook into a COM port for hardware monitoring or use a software-only solution like COM Sniffer to capture communication without wiring.
A Virtual COM port emulator allows you to create unlimited COM port pairs. Each pair includes two ports where the output of one becomes the input of the other, exactly like a null-modem cable. This makes it simple to connect two serial programs directly and test their communication.
SerialTool’s Virtual COM Port Emulator lets you create and manage multiple virtual COM port pairs on Windows. Each virtual pair behaves like a real null-modem connection: data sent to one port is instantly received on the other, allowing two applications to exchange serial data without physical cables.
Unlike basic emulators, SerialTool offers advanced functions such as splitting, sharing, and joining COM ports, testing serial software, and supporting control line emulation. You can redirect traffic between real and virtual ports and achieve high-speed transfer for accurate simulation.
SerialTool’s Virtual COM Port Utility maps virtual COM ports on a Windows PC and redirects application data across a network. Instead of sending bytes through a local serial interface, traffic is encapsulated over TCP/IP and delivered to a remote device server.
This redirection allows legacy software expecting a local COM port to transparently communicate with network-attached equipment. The utility works with RS232 and RS485 devices and ensures that applications do not need to be modified to work over Ethernet.
By combining virtual port creation with network redirection, SerialTool makes remote debugging, monitoring, and device integration easier. Developers and system integrators can map serial equipment to virtual ports and seamlessly control them across LAN or WAN connections.
Read more about COM Redirector, COM Splitter, and Serial-to-Ethernet on the Virtual COM Port Utilities page
SerialTool is a complete Modbus Software solution that lets you read and write registers or coils from any Modbus RTU, ASCII, or TCP device. It allows you to monitor, debug, and visualize Modbus communication in real time on Windows, macOS, and Linux.
With the integrated COM Sniffer (Windows), SerialTool also works as a Modbus Analyzer. You can log Modbus RTU, ASCII, and TCP traffic, export it in pcap format, and analyze it in Wireshark for full protocol visibility and advanced debugging.
SerialTool Hex File Editor is a powerful Binary Editor that lets you edit files at the binary level in both hexadecimal and ASCII format.
SerialTool lets you edit binary files with a HEX Editor and send them over the serial port. A complete solution for HEX editing and serial communication.
Use SerialTool with Python to monitor, debug, and automate serial port communication. A powerful pySerial alternative for RS232/RS485 on Windows, macOS, Linux.
SerialTool integrates with Python to send, receive, and log serial port data without relying on console tools like pySerial miniterm. With Python scripting inside SerialTool, you can automate COM port communication, debug RS232/RS485 devices, and create powerful serial workflows directly from Windows, macOS, or Linux.
SerialTool integrates Python scripts and a full Python API to simplify serial port communication. Send, receive, debug, and log RS232/RS485 on Windows, macOS, and Linux.
SerialTool is a USB mapping tool for Windows, macOS, and Linux that automatically detects all USB ports, highlights serial ports, and provides complete USB device information for each COM connection.
SerialTool lets you redirect serial port data and signals over any TCP/IP network, turning local COM ports into remote network devices. With no extra hardware, you can send or receive RS232/RS485 data across LAN or WAN using your existing serial software.
Unlike older utilities, SerialTool supports Windows, macOS, and Linux. It extends serial-to-network communication beyond TCP/IP by supporting TCP, UDP, HTTP POST/GET, and HTTPS POST/GET calls. This lets you forward COM port data across LAN, WAN, or cloud services, integrate with web APIs, and monitor devices in real time without additional hardware.
With SerialTool you can easily record serial port traffic to a file from multiple RS232/RS485 or virtual COM ports at the same time. This tutorial explains step by step how to monitor, sniff, and log communication, then save the captured data in text, CSV, or pcap format for later analysis.
Features of SerialTool
The Ultimate Serial Port Software: Cutting-Edge Features and Unmatched Performance
Multiplatform free software
With SerialTool, you can monitor, sniff, debug, communicate, and log any serial port. It runs on Windows, macOS (Intel and Apple Silicon), and Linux (compatible with most distributions). A PRO version is also available at highly competitive prices, offering unmatched capabilities compared to any other serial port software.
Unlike other software, SerialTool manages multiple serial ports in a single instance. You can assign a serial port number to each COM port (Windows) or device (Mac OS and Linux).
In addition to the terminal mode, the hexadecimal mode allows you to display the sent and received packets from the serial ports in different colors. It is also possible to mark some bytes with different colors to distinguish them during the log and you analyze each byte and display it in ASCII, hexadecimal, binary, or octal mode.
Python scripting with a professional editor to create your programs and use the SerialTool graphical interface. Some examples are already integrated into SerialTool and just need to be adapted to your needs.
COM Sniffer allows, similarly to SpyPort, monitoring and sniffing of data transmitted through a COM port opened by another software, as well as all other IOCTL signals. This function is only available for Windows users with a PRO license.
SpyPort function to monitor all serial port traffic at the Kernel level, even from third-party programs. This function is only available for Windows users with a PRO license.
SerialTool integrates a powerful, reliable, and professional Hex File Editor. This functionality makes SerialTool unique, dealing not only with the serial port but with all possible developer needs.
SerialTool offers a graphical tool to monitor packets and view them like an oscilloscope. A very useful tool for taking the first steps in exploring the serial port.
ByteVisualizer is designed to deliver advanced data visualization and transformation capabilities at both the byte and bit levels, as well as simulate data transmission over a Serial Port.
SerialTool allows you to archive all incoming and outgoing packets from the serial port in a list that can be exported in CSV or text format. You can search within the packets for a specific ASCII or hexadecimal sequence.
Map USB ports and connected device. USBMap is a feature of SerialTool that lists basic information about USB host controllers, USB hubs, and connected USB devices.
SerialTool offers the ability to send timed packets directly to the serial port for a set number of times. You can also add a counter before sending the packet or at the end of a packet to make the debugging mode of your applications even more detailed.
SerialTool allows you to edit and send pre-stored buffers to increase simplicity and speed of use. The buffers can be recalled and sent directly from the dedicated panel.
The Auto-Answer mode allows you to automatically respond with predefined answers upon the arrival of a specific sequence of bytes (hexadecimal or ASCII) in a serial port. This function is very useful during the development of embedded systems where you need to simulate a response upon the arrival of a particular sequence of bytes.
SerialTool offers the possibility to trigger alarms upon the arrival of a specific sequence of bytes and decide how to operate. You can set an alarm upon the arrival of a packet that contains or does not contain a specific sequence of bytes (ASCII or hexadecimal) or if it starts or does not start with a specific sequence of bytes. The alarm logs can be directly saved to a file.
SerialTool allows you to save all serial traffic in and out of a specific serial port in ASCII or binary file mode. This function allows precise monitoring of all serial traffic.
You can send all incoming or outgoing traffic from a serial port directly over the network in TCP, UDP mode, or to an HTTP script of type GET or POST. This mode is very useful for remote logging of a device to verify its correct operation.
It is possible to automatically complete the sending of a packet with a wide range of CRCs at 8-Bit, 16-Bit, 24-Bit, and 32-Bit with the most commonly used polynomials.
Among the various functionalities, you can freely choose the graphical interface appearance by selecting from the proposed themes or directly loading your custom theme created in .qss format.
Comparison of Features
FREE Version
Professional Version
Operating System
Windows 32/64Bits, Mac OS (Intel and Apple ARM - from OS Version 10.14 (Mojave)), Linux
Windows 32/64Bits, Mac OS (Intel and Apple ARM - from OS Version 10.14 (Mojave)), Linux
