Yes, Win32 Disk Imager is widely reported to work on Windows 11, but with an important qualification: it is not officially tested or certified for Windows 11. The current release, version 1.0.0, was published on 2017-03-08, years before Windows 11 existed, so no official Windows 11 testing could have been done for that release. If you use it on Windows 11, you are relying on a mature, older Windows tool that happens to keep working, not on a version built for the current operating system. For most straightforward read and write jobs, that distinction does not stop it from doing its job, but it should shape how carefully you verify the result.
Win32 Disk Imager is a Windows-only tool, released under GPLv2, for writing a raw disk image to a removable drive and for reading a whole drive back into an image file. It does not parse ISO filesystems, it does not compress its output, and a Read captures the whole device, so the resulting .img file is the full size of the device, not just the used data. A Write overwrites the entire destination drive. Those behaviours have not changed on Windows 11, and they are the reason the tool still needs care even when it launches without complaint.
Before you start on Windows 11
Download version 1.0.0 from the Download page and check that you have the right file for your system: the installer is 12.6 MB and the portable zip is about 17.0 MB. Use a good-quality card reader and a card you can afford to erase completely, because the destination will be overwritten in full. Back up anything on the card first, and close other programs that might try to open the card, such as file managers or disk tools. If Windows shows a SmartScreen warning for an older unsigned-style installer, only proceed if you downloaded the file from a source you trust and you understand what you are installing.
- Run Win32 Disk Imager as administrator, every time.
- Insert the card or USB drive before you choose a device, and double-check the drive letter.
- Choose the correct .img file, then check the drive letter a second time before you click Write.
- After writing, use safe ejection and test the card in its target device before you rely on it.
Step-by-step: writing an image on Windows 11
The basic workflow is described in detail in How to Use Win32 Disk Imager, and the same steps apply on Windows 11. First, run the program as administrator. Second, click the folder icon and select your .img file. Third, select the device letter for your card or USB drive from the Device drop-down. Fourth, click Write and confirm. Do not remove the card while the progress bar is running, and do not let the PC sleep in the middle of a write if you can avoid it. When the write finishes, the program reports success, but that report alone does not prove the target device will boot: test it in that device.
To make a backup instead, follow How to Back Up an SD Card to an .img File. Select the device, choose a destination filename ending in .img, and click Read. Remember that the output will be the full size of the card, so a 32 GB card produces a roughly 32 GB image even if only a few gigabytes are in use. You can compress that file afterwards with a tool such as 7-Zip, but Win32 Disk Imager itself does not compress it.
Windows 11 quirks worth knowing
The most common Windows 11 problem is not the tool failing to start, but permission. If you launch it normally and get an access-denied error, close it and relaunch as administrator; that fixes a large share of write failures. See also Win32 Disk Imager Error 5: Access Denied if the error persists, because another program holding the drive open, or a locked or failing card, can produce the same message. A second quirk is the format prompt described above: Windows 11 cannot read the Linux partitions on a Raspberry Pi card, so it may offer to format the drive after a successful write. Declining that prompt is part of normal use, not a sign the write failed.
Limitations on Windows 11
Win32 Disk Imager writes raw images only. It will not expand a filesystem to fill a larger card, it will not shrink an image, and it will not let you browse the files inside an image the way an ISO tool would. If you write a Raspberry Pi image to a larger card, you will usually need a separate step to expand the filesystem afterwards, as covered in Expand Filesystem After Flashing. It also has no built-in scheduling, no incremental backup, and no verification pass beyond the verify feature added in version 1.0.0. If you need a modern, actively maintained writer with a simpler interface, compare it with current alternatives in Win32 Disk Imager vs Rufus and Win32 Disk Imager vs balenaEtcher before you commit to it for regular use.
None of this means the tool is unusable on Windows 11. Treat it as a proven but ageing utility: back up anything important, verify the written card by booting it, and do not assume one successful run means official support on every configuration. The maintainer returned in November 2024, but no new release has followed.
Frequently Asked Questions
Is Win32 Disk Imager officially supported on Windows 11?
No. The current release, version 1.0.0, dates from 2017-03-08, before Windows 11 existed, so it cannot have been officially tested or certified for Windows 11. Many users report that it works on Windows 11, but that is user experience, not an official compatibility statement.
Do I need to run it as administrator on Windows 11?
Yes. Right-click the program and choose Run as administrator. Without elevated rights, writing to a card or drive is likely to fail, commonly with an access-denied error.
Why does Windows ask to format my card after writing an image?
That prompt is normal when the written image contains a Linux filesystem that Windows cannot read. Do not format the card. Eject it safely and use it in the device it was written for, such as a Raspberry Pi.