rpi-imager
Raspberry Pi Imaging Utility
Raspberry Pi Imager is the quick and easy way to install Raspberry Pi OS and other operating systems to a microSD card, ready to use with your Raspberry Pi. Watch our 45-second video to learn how to install an operating system using Raspberry Pi Imager. Download and install Raspberry Pi Imager to a computer with an SD card reader. Put the SD card you'll use with your Raspberry Pi into the reader and run Raspberry Pi Imager. NOTE: Relies on polkit when run as regular user. It doesn't have to be polkit-gnome, but it has a low install base overhead.
Apache-2.0