Best USB Serial Adapters of 2026

The Gearmo USB to Serial Adapter with LED Indicators is a 5ft long serial adapter that connects old DB-9 serial communication devices to modern computers with USB. It features a full LED dual-color display for testing RS-232 host to device link easily. This adapter supports multiple OS platforms including Windows 7, 8, 10, and 11, as well as Linux and MacOS 10.X. Gearmo is a reliable and superior-built product and offers CAD, Mechanical Drawings, and Data Sheets.

The Tripp Lite Keyspan High-Speed USB to Serial Adapter connects a serial device to a USB computer with plug-and-play convenience. It draws power directly from your computer and supports data transfer rates up to 230 Kbps, twice the speed of a standard built-in serial port. The DB9 serial port is seen as a COM port by your computer, and is available for use by any program that accesses COM ports. Additionally, an LED shows adapter status and data activity at a glance.

The HiLetgo CP2102 USB 2.0 to TTL Module is a stable and reliable serial adapter that allows you to connect your MCU to your computer with ease. It features a standard USB type A male and TTL 5pin connector, with pins for 3.3V, RST, TXD, RXD, GND, and 5V. It supports a wide range of baud rates, from 300 bps to 1.5 Mbps, and is compatible with Windows, Mac OS, and Linux.

The JSAUX DisplayPort HDMI Adapter lets you easily connect your DisplayPort-enabled device to an HDMI display with stunning clarity. It supports up to 4K resolution at 30Hz, providing sharp and vibrant visuals for your monitor or TV. If you want smoother motion at lower resolutions, it also supports 2K at 60Hz and 1080p at 120Hz, perfect for gaming or video playback. You won’t need any drivers or software to get started—just plug it in and go, making setup quick and hassle-free. Plus, the adapter’s durable build with gold-plated connectors ensures long-lasting performance and reliable connections for your devices.

The StarTech.com USB to Serial RS232 Adapter is a portable and versatile device that allows you to connect, monitor, and control a serial device through USB. It features broad compatibility with USB 1.0 or 2.0 ports and works with Windows, Mac, or Linux systems. The adapter also supports fast transfer speeds up to 921.6Kbps and is USB-powered, requiring no additional power adapter. Its lightweight design makes it ideal for professionals on the go.

The OIKWAN USB to RS232 Adapter with FTDI Chipset is a high-quality, reliable and convenient solution for connecting serial devices to your Windows, MAC or Linux system. The latest FTDI chipset ensures fast and stable operation, while the gold-plated USB RS232 connector and PVC cable provide excellent performance and durability. With plug-and-play installation, this USB-powered adapter cable supports a transfer rate of up to 1Mbps and can be used with a wide range of devices, including modems, scanners, printers and more.

The StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI - Null Modem - USB 1.1 / 2.0 - Bus-Powered (ICUSB232FTN) offers maximized portability and compatibility with your Windows, Mac, or Linux systems. It features a single cable design that eliminates the need for additional adapters and cables. This serial adapter can convert your available USB port into a null modem RS232 DB9 serial port, which resolves any DTE/DCE conflicts. It also supports fast transfer speeds of up to 921.6Kbps.

The DSD TECH USB UART Cable is a versatile tool that supports multiple TTL voltage levels including 5V, 3.3V, 2.5V, and 1.8V, allowing you to connect with a wide range of devices easily. Featuring the reliable FTDI FT232RNL chip, it offers stable and industrial-grade performance compatible with Windows, Linux, and MacOS systems, ensuring smooth communication. The included transparent protective case shields the device from static interference and accidental short circuits, giving you peace of mind during use. Additionally, the cable provides access to various pins like UART TX, RX, RTS, CTS, and more, making it convenient for detailed hardware debugging and development tasks.

The SABRENT USB Serial Adapter is a high-quality cable that allows you to connect your computer to serial devices such as modems, printers, and GPS devices. With a cable length of 6 feet, it provides flexibility in placing your devices. The male thumbscrews on the side connectors ensure a secure connection. This adapter supports remote wake-up and power management, eliminating the need for IRQs and avoiding IRQ conflicts. It also features a 96-byte buffer for efficient data transfer. Compatible with USB Specification v1.1(0) and USB CDC v1.1, USB 2.0, it offers seamless compatibility with various devices. With the SABRENT USB Serial Adapter, you can easily connect and manage your serial devices hassle-free.

The waveshare USB RS485 Adapter is an industrial-grade converter that allows fast and reliable communication between USB and RS485 devices. It comes with original FT232RL and is embedded with multiple protection circuits such as lightning-proof, resettable fuse, ESD protection, and TVS diode, ensuring stability, reliability, and safety. The adapter is small in size, easy to use, and allows automatic transceiving. It's an ideal choice for industrial control equipment and applications with high communication requirements. The onboard self-recovery fuse and protection diodes ensure stable current and voltage outputs and provide over-current/over-voltage protection, improving shock resistance. The adapter also features 3 LEDs that indicate the power and transceiver status. It supports various operating systems, including Mac, Linux, Android, WinCE, Windows 10 / 8.1 / 8 / 7 / XP.