.INO File Extension

Arduino Sketch

Developer Arduino
4.2  |  236 Votes

What is an INO file?

An INO file is a software program created for use with Arduino, an open-source electronics prototyping platform. It contains source code written in the Arduino programming language (which is a variant of C++). INO files are used to control Arduino circuit boards.

More Information

Screenshot of a .ino file in GitHub Atom
INO file open in GitHub Atom

The Arduino electronics prototyping platform allows developers to create and install basic programs, called sketches, on a variety of specialized circuit boards. Sketches can perform simple functions, such as making an LED installed on a circuit board blink, or complex functions, such as transmitting data over the internet. Developers create Arduino sketches in the Arduino Integrated Development Environment (IDE), which saves sketches as INO files.

Prior to Arduino 1.0, the Arduino IDE saved sketches as .PDE files. While developers can still open PDE files in Arduino, they should now save sketches (including those previously saved as PDE files) as INO files.

How to open an INO file

INO files are meant to be opened and edited in the Arduino Integrated Development Environment (multiplatform). To open an INO file in Arduino, select File → Open from the program's menu bar.

Because INO files are plain text files, you can also open them in any text editor, including:

Open over 400 file formats with File Viewer Plus.Free Download

Programs that open INO files

Autodesk Tinkercad for Windows
Chrome OS
Included with OS

Verified by FileInfo.com

The FileInfo.com team has independently researched the Arduino Sketch file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

If you would like to suggest any additions or updates to this page, please let us know.