Step-by-Step Procedure to Write OS Image for Raspberry Pi

Operating systems are an essential component of any computing device. Without an OS, the hardware is just a hunk of silicon and metal. An OS allows the software to communicate with and control the hardware. This is true for personal computers as well as single board computers (SBCs) like the Raspberry Pi.

The Raspberry Pi is a tiny, credit card-sized SBC that has taken the maker world by storm since its launch in 2012. Its low cost and versatility have made it a favorite for DIY projects. But like any computer, the Raspberry Pi also needs an OS to function.

In this comprehensive guide, we will cover everything you need to know about how to write OS images for Raspberry Pi. We will be using the official Raspberry Pi Imager tool to write OS images. But before we get into the nitty-gritty, let’s first understand what the Imager is and why it is the best tool for the job.

What is Raspberry Pi Imager?

The Raspberry Pi Imager is the official SD card writing utility for Raspberry Pis, created by the Raspberry Pi Foundation. It provides an easy way to install Raspberry Pi OS and other operating systems to an SD card or USB drive.

The Imager simplifies the process of installing an OS on a Pi. You don’t need to manually download OS image zip files and use third-party tools like Etcher to write them. The Imager has a built-in list of all major OSes supported on the Pi, including Raspberry Pi OS, Ubuntu, Windows 10 Iot, RetroPie and many others.

Apart from the default OS list, you can also write any custom OS image file downloaded from the web using the Imager. The app supports image files like ISO, IMG, ZIP, etc.

Some key advantages of using the Raspberry Pi Imager are:

  • Simple and easy-to-use interface.
  • Supports writing images to SD card and USB drives.
  • The built-in list of all major OSes supported on Pi. There is no need to find and download images separately.
  • Can write any custom OS image file.
  • Available for Windows, MacOS, and Linux.
  • Actively maintained and updated by Raspberry Pi Foundation.

In summary, the Raspberry Pi Imager is the best tool recommended for writing OS images to boot media for your Pi projects. It takes the guesswork out of finding and downloading system images.

Now that we know what the Imager is and why it is useful let’s move on to installing it on our computer.

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Install Raspberry Pi Imager on Windows

To install Raspberry Pi Imager on a Windows PC, follow these steps:

Step 1: Go to the official download page and click on “Download for Windows”. This will download the installer exe file.

Step 2: Once downloaded, double-click on the imager_x.x.x.exe file to launch the installer.

Downloaded Imager file

Step 3: Click Install on the welcome screen.

Installation Welcome Screen

Step 4: Accept the license agreement if it asks and click Next. The new version doesn’t ask for the installation location. By default, the Imager will be installed in C:\Program Files (x86)\Raspberry Pi Imager\. The program gets installed in a few seconds. Once done, click Finish to launch Raspberry Pi Imager. The application will open up ready to write OS images.

Raspberry Pi Imager First Time Launch

The Windows installer takes care of downloading all necessary dependencies and sets up Raspberry Pi Imager with just a couple of clicks.

Install Raspberry Pi Imager on Mac

Here are the steps to install Raspberry Pi Imager on MacOS:

  1. Download the DMG file for MacOS from the official page.
  2. Double-click on the downloaded imager_x.x.x.dmg file. This will mount the disk image.
  3. Drag and drop the Raspberry Pi Imager app to the Applications folder shortcut.
  4. Eject the mounted disk image.
  5. Launch Raspberry Pi Imager from the Applications folder on your Mac.

That’s it. The application is now ready to write OS images on MacOS.

Install Raspberry Pi Imager on Ubuntu

It is simple to install Raspberry Pi Imager on Linux distributions. We use Ubuntu as a demo machine in this blog. To install Raspberry Pi Imager on Ubuntu or any Debian based Linux distribution, run these commands in the terminal:

sudo apt update
sudo apt install rpi-imager
Install Raspberry Pi on Ubuntu
Launch Raspberry Pi Imager on Ubuntu

For other Linux distributions like Fedora, a snap package is available. Refer the documentation for distribution-specific installation instructions.

How to Write OS Image for Raspberry Pi?

The process of writing an OS image is straightforward with the Raspberry Pi Imager, irrespective of the host platform. The steps are the same on Windows, Mac or Linux.

Here is how to burn an OS image for Raspberry Pi using the Imager tool:

Step 1: Insert the SD Card or USB Drive

First, insert the SD card or USB drive you want to write the image to into your computer. Make sure the card/drive is not write-protected.

The Imager will automatically detect inserted drives. It is recommended to use an SD card of at least 8GB capacity. For USB drives, select a decent-capacity drive from reputed brands for reliable performance.

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Step 2: Choose the Operating System

Launch the Raspberry Pi Imager app. You will see the main screen with OS, storage, and write buttons.

Click on the “Choose OS” button. This will open a menu with a list of supported operating systems.

Scroll down the list and click on the OS you want to install. For this demo, we will pick the default “Raspberry Pi OS (64-bit)”.

The app will go back to the main screen and show the selected OS below the button.

Alternatively, you can install any custom OS image not on the default list:

  • Click on “Choose OS” and select “Use custom” at the bottom.
  • A file explorer will open – navigate to and select the OS image file.
  • Supported image formats are ISO, IMG, ZIP, etc.
  • Select the image, and Imager will return to the main screen.
Choose the Operating System

You can choose any OS from the list of recommended images:

  • Raspberry Pi OS – The official supported OS from Raspberry Pi Foundation. Available in different flavors with and without desktop environment.
  • LibreELEC – A Linux distribution for running Kodi on Raspberry Pi.
  • Ubuntu – Popular Linux distribution provided by Canonical.
  • RetroPie – Turns Raspberry Pi into a retro-gaming console.
  • RISC OS – A non-Linux OS designed specifically for Raspberry Pi boards.
  • Specialist OS – Includes OS images for networking, industrial applications, etc.
  • Misc Utility Images – Tools for bare metal programming, multi-boot setups, etc.
  • Other General Purpose OS – Third party Linux distributions like Kali Linux, Gentoo, Fedora, etc.

Step 3: Choose SD Card or USB Drive

After picking the OS, click the “Choose SD card” button. This will display a list of connected drives. Select the drive you inserted – it will be listed by brand, size, and drive letter/name. The app will again go back to the main screen with the selected drive shown.

Choose SD Card or USB Drive

Step 4: Write the OS Image

Finally, click on the “Write” button to begin writing the OS image to the SD card or USB drive. A popup will appear showing the selected OS and target drive – click “Yes” to confirm and start writing. The Imager will now write the OS image to the drive. This may take 5-15 minutes depending on image size and drive speed. Once writing is complete, you will get a “Write Successful” message. Click “Continue” to finish.

Raspberry Pi Imager selected OS and Drive
Confirm writing
Image writing in process

Eject and remove the drive from your system. It is now ready to boot the Pi with the installed OS!

Image verification in process
Completion of Image writing process

So in just a few clicks, we wrote the Raspberry Pi OS image to a drive using the Imager. This same process applies to all other OSes – just select a different system in step 2 and the Imager will handle the rest.

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Advanced Options in Raspberry Pi Imager

The Raspberry Pi Imager packs some advanced options to customize your OS install without needing to edit config files manually.

When writing Raspberry Pi OS (or Raspbian), an “Advanced Options” button appears on the main screen. Click it to open a configuration menu.

Advance Options in Raspberry Pi Imager

Here you can set options like:

  • Set default username and password – This sets up an account on first boot.
  • Configure wireless LAN – Enter your WiFi SSID and password. The Pi will auto-connect on first boot.
  • Set locale settings – Configure timezone, keyboard layout etc.
  • Enable SSH – Enable SSH server for headless remote access.
  • Configure boot options – Set things like auto login, desktop autostart etc.
  • Set hostname – Useful for identifying the Pi on a network.
  • Add custom preseed scripts – For automation.

These options are written to the image and take effect on first boot after installation. It saves having to manually configure a lot of settings later.

The Imager is under active development. More advanced features are expected in future releases.


Installing an operating system on a Raspberry Pi does not need to be complicated if you use the right tools. Raspberry Pi Imager from the Foundation makes it extremely simple to write OS images to SD cards and USB drives.

It streamlines the entire process – download images, check drives, write data, validate written data – with a clear user interface. Additional options enable tweaking OS settings during installation itself.

For both novice and experienced Raspberry Pi users, Raspberry Pi Imager is the recommended way to get started with a new OS quickly.

So go ahead, download and install the imager on your computer, choose your preferred OS, select a drive, and get your Raspberry Pi up and running with a fresh operating system in minutes!

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