Verdict: if you are setting up a Raspberry Pi for the first time, use Raspberry Pi Imager. If you want to back up a working Pi card to a full .img file you can restore later, use Win32 Disk Imager. They are not really rivals: one is the easiest way to get Raspberry Pi OS onto a card, and the other is the simplest way to read a card back to a raw image on Windows. Many Pi owners end up keeping both installed.
That split comes from what each tool was designed to do. Raspberry Pi Imager is the Raspberry Pi Foundation’s official tool for preparing SD cards. It offers a list of operating systems, downloads the one you choose, and writes it. Win32 Disk Imager is a general Windows raw-imaging tool. Its latest release, version 1.0.0, dates from 2017-03-08, it is licensed under GPLv2, and it is Windows-only, with no Mac or Linux version. It writes .img files and reads whole devices back to .img files, but it does not download operating systems and it does not parse ISO filesystems.
Comparison at a glance
| Feature | Win32 Disk Imager | Raspberry Pi Imager |
|---|---|---|
| Platform | Windows only | Windows, Mac and Linux |
| Write an OS image | Yes, from a local .img file | Yes, with built-in OS download |
| Read a card back to .img | Yes, full device read-back | Not its core job |
| Built-in validation | Verify Image feature in v1.0.0 | Write verification as part of flashing |
| Compression | None; a read-back equals the full device size | Downloads are handled by the tool, not a general compressor |
| ISO handling | Does not parse ISO filesystems | Works from its OS catalogue and local images |
| Maintenance status | Legacy; last release 2017-03-08 | Actively maintained by the Raspberry Pi Foundation |
| Price | Free | Free |
What Raspberry Pi Imager does best
Raspberry Pi Imager removes the two steps that trip up beginners: finding the right download and getting the first-boot settings right. You pick your Pi model and operating system from a menu, and the tool fetches the image and writes it. Its advanced options let you set a hostname, enable SSH, and configure Wi-Fi before first boot, which saves a round of keyboard-and-monitor setup. For a first install, that guided flow is genuinely hard to beat, and because it is the official tool, its OS list stays current with Raspberry Pi releases.
The trade-off is that Pi Imager is opinionated. It is excellent at putting a known operating system on a card, but it is not a backup tool. If your Pi has months of configuration, installed software, and data on it, Pi Imager will not give you a simple button to clone that whole card into a restorable file. That is the gap Win32 Disk Imager fills.
What Win32 Disk Imager does best
Win32 Disk Imager has two jobs and does both plainly: Write takes a local .img file and copies it sector by sector to the chosen drive, and Read copies the whole device sector by sector to a .img file. That Read function is the reason it still matters for Pi owners. After you have a working Pi, you can read the card back, store the .img file, and restore it later if the card fails. Our guide to backing up an SD card to an .img file walks through that workflow, and flashing Raspberry Pi OS with Win32 Disk Imager covers the write side.
The costs of that simplicity are real. A read-back is the full size of the device, because Win32 Disk Imager has no compression and no option to read only used space; a 32 GB card produces a 32 GB file, even if only a few gigabytes are used. You can compress that file afterwards with a tool such as 7-Zip, but Win32 Disk Imager will not do it for you. It also has no command-line interface, no scheduled imaging, and no validation beyond the Verify Image feature added in v1.0.0. If you want automatic nightly backups, neither this tool nor Pi Imager is the right answer; you need a proper backup solution.
When Win32 Disk Imager is still the right pick
- You want a full, restorable backup of a working Pi card on Windows.
- You already have an .img file and just want a small, no-nonsense writer.
- You are restoring an image you made earlier, or cloning one known-good card to others.
- You are working offline and already have the image file on disk.
When to switch to Raspberry Pi Imager
- This is your first Pi install and you do not have an OS image yet.
- You want the tool to download Raspberry Pi OS and set hostname, SSH, or Wi-Fi for first boot.
- You are on a Mac or Linux computer, where Win32 Disk Imager cannot run at all.
- You want a maintained tool with current OS listings and ongoing updates.
A practical rule: flash with Pi Imager when you are starting fresh, and back up with Win32 Disk Imager once the Pi is set up the way you like it. If you only ever do one of those jobs, pick the tool built for it. For the full basics, see how to use Win32 Disk Imager, and get the program from the download page. If your card will not boot after flashing, the write itself is only one suspect; see also Raspberry Pi will not boot after flashing.
Frequently asked questions
Can Raspberry Pi Imager read an SD card back to an .img file?
No. Raspberry Pi Imager is built to write an operating system to a card, not to back a card up to a raw image. If you need a full read-back, use Win32 Disk Imager, which has a dedicated Read function.
Does Win32 Disk Imager download Raspberry Pi OS for me?
No. Win32 Disk Imager only writes an image file you already have. You must download Raspberry Pi OS separately first, then point Win32 Disk Imager at that file.
Which tool should a first-time Raspberry Pi user pick?
Raspberry Pi Imager, because it downloads the operating system, writes it, and handles common first-boot settings in one guided flow. Win32 Disk Imager is the better second tool once you want backups.
Can I use both tools on the same card?
Yes. Many people flash with Raspberry Pi Imager and back up with Win32 Disk Imager. Just be careful to pick the correct drive in Win32 Disk Imager, because Write overwrites the entire destination drive.