Step #2: The Teensy Loader Application

The Teensy Loader program communicates with your Teensy board when the HalfKay bootloader is running, so you can download new programs and run them.

Update: Teensy LC & 3.x & 4.x are supported by Teensyduino. After installation, Teensy Loader is in hardware/tools. It is run automatically when using Verify or Upload within the Arduino software.

Teensy Loader is available for these operating systems:


Linux (Ubuntu)


Command Line Version

The Teensy Loader is also available in a command line version for advanced users. It works on Mac, Windows, Linux and BSD Unix.