How to Flash Raspberry Pi OS Using balenaEtcher

Etcher (officially balenaEtcher) is a free, cross-platform tool that writes OS images to SD cards and USB drives. Here's how to use it to prepare a Raspberry Pi OS card.

What You'll Need

A microSD card (8 GB minimum, 16 GB or larger recommended; Class 10 / A1 or better)
An SD card reader (built-in or USB)
A computer running Windows, macOS, or Linux
A stable internet connection

Step 1: Download the Raspberry Pi OS Image

Go to raspberrypi.com/software/operating-systems
Choose your edition:
- Raspberry Pi OS (64-bit) — recommended for Pi 3, 4, 5, and Zero 2 W
- Raspberry Pi OS Lite — no desktop, ideal for headless/server use
- Raspberry Pi OS Full — includes extra recommended software
Click the Download link to get the .img.xz file (no need to extract — Etcher reads compressed images directly).

Step 2: Download and Install balenaEtcher

Visit etcher.balena.io
Download the installer for your operating system.
Install and launch Etcher. On macOS and Linux you'll typically need to grant it administrator privileges so it can write to removable media.

Step 3: Insert the SD Card

Plug the microSD card (via adapter or reader) into your computer. Back up anything important on it first — flashing erases everything.

Step 4: Flash the Image

In Etcher, click Flash from file and select the Raspberry Pi OS image you downloaded.
Click Select target and pick your SD card. Double-check the drive letter or device name — picking the wrong disk will wipe it. Etcher hides system drives by default, which helps, but verify anyway.
Click Flash! and enter your admin password if prompted.
Wait for the Flashing and Validating stages to complete (usually 3–10 minutes depending on card speed). Don't unplug the card during this process.
When you see Flash Complete!, Etcher will safely eject the card. You may see a "You need to format the disk" popup on Windows — ignore and cancel it. That's Windows not recognizing the Linux boot partition; the card is fine.

Step 5: (Optional) Enable SSH or Wi-Fi for Headless Setup

If you won't be using a monitor and keyboard, configure access before first boot:

Re-insert the SD card so the boot (or bootfs) partition appears.
Create an empty file named ssh (no extension) in the root of that partition to enable SSH.
For Wi-Fi, create a file named wpa_supplicant.conf with your network details, or — easier — use Raspberry Pi Imager instead of Etcher, which has a built-in settings dialog for SSH, Wi-Fi, hostname, and user account.

Step 6: Boot Your Raspberry Pi

Eject the SD card from your computer.
Insert it into the Pi's SD slot.
Connect your peripherals and power supply.
The Pi will boot, expand the filesystem on first run, and reboot into the desktop (or login prompt for Lite).

Troubleshooting

"Source image is too large": Your SD card is smaller than the image. Use a larger card.
Validation fails: Try a different SD card or reader; cheap or worn-out cards often fail here.
Pi won't boot (no green LED activity): Re-flash the card, try a different card, and confirm your power supply meets the Pi's requirements (5 V / 3 A for Pi 4 and 5).

A Note on Tool Choice

The Raspberry Pi Foundation now recommends its own Raspberry Pi Imager for most users — it downloads the OS for you and includes the headless-setup options mentioned above. Etcher is still excellent if you already have the image file or prefer a more general-purpose flasher, but if you're starting fresh, Imager is a touch more convenient.