How to check which Windows 11 build you have
- Windows 11, version 25H2
- Windows 11, version 26H2
- Windows 11, version 26H1
- Build 26300.9032
- Build 26340.9233
Priya Natarajan3 min readQuick answer
To check your Windows 11 build on pre-release builds, look at the desktop watermark in the lower-right corner of your screen. You can also view your Windows core version, Insider channel, and build details by going to Settings > Windows Update > Windows Insider Program. For packaged applications, top-level version numbers can be checked directly in Settings > Apps > Installed apps.
Checking which Windows 11 build you have installed on your computer is an essential step when troubleshooting issues, validating new features, or verifying system updates. Every Windows update brings a specific build number that identifies the underlying operating system core, platform changes, and servicing updates applied to your machine. Whether you are running standard servicing releases or testing pre-release software, knowing your build number ensures you understand which features are active on your device and whether your installation remains fully supported.
For users participating in preview testing, keeping track of your Windows 11 build is particularly important due to flight certificate expiration dates. Windows Insider Preview builds rely on security certificates that are periodically renewed to keep test devices receiving ongoing updates. For instance, older flight certificates are set to expire on August 11, 2026, meaning devices must be updated to Build 26300.9032 or later to remain on a supported build path. Furthermore, knowing whether your system relies on Windows 11, version 25H2/26H2, a targeted version 26H1 release for specific silicon hardware, or an early platform build like Future Platforms helps you manage operating system upgrades and channel transitions without unexpected data loss.
Steps
Illustration: the Installed apps page under Settings > Apps
- Look at the lower-right corner of your desktop to check for a visible watermark, which displays the build number on pre-release builds.
- Open the Settings app from your Start menu or by pressing the Windows key and I together.
- Go to Settings > Windows Update > Windows Insider Program to view your current Windows core version and Insider channel.
- Click Choose your Insider settings to review the exact channel experience assigned to your device.
- Go to Settings > Apps > Installed apps to view version numbers listed at the top level for packaged applications on your PC.
- Go to Settings > Windows Update > Windows Insider Program > Feature flags if you need to check manual feature flags available for your specific build.
What it changes
Checking and verifying your Windows 11 build number provides full visibility into the core operating system branch and feature set running on your PC. Windows releases are structured around specific core versions. Standard retail releases align with builds such as Windows 11, version 25H2/26H2, whereas specialized branches like version 26H1 represent targeted releases designed to support specific silicon in the Windows hardware ecosystem. Knowing your exact build helps you identify whether your machine receives updates through standard servicing or enablement packages, such as Build 26300.9032 and Build 26340.9233, which deliver updates to version 26H2.
Your build number also determines how new operating system capabilities are delivered to your system. Many experimental features are introduced using Controlled Feature Rollout (CFR) technology, which rolls out changes to a subset of devices before expanding broadly. For example, Build 26340.9233 updated Settings > Apps > Installed apps to display version numbers at the top level for packaged apps, while introducing an Open apps maximized toggle under Settings > Accessibility > Visual effects and app-by-app permissions under Settings > Privacy & security > Camera, Microphone, or Location. Meanwhile, Build 26300.9032 introduced refined Settings search ranking and automatic search scope expansion under Settings > Privacy & security > Search. Verifying your build number allows you to confirm whether these system capabilities, interface updates, and security flight certificates are active on your machine.
Undo
- Go to Settings > Windows Update > Windows Insider Program to access your channel settings.
- Select Choose your Insider settings to see the available preview channels for your current Windows core version.
- Select the radio button for the channel you want to move to, such as switching between Release Preview, Beta channel, or Experimental channel on the same Windows core version.
- Perform a clean installation of Windows 11 if your device is on Experimental (Future Platforms) or Windows 11, version 26H1 and you need to return to a standard retail core build, as switching branches from higher development cores requires a full OS reinstall.
Sources
Frequently asked questions
Where can I see my Windows 11 build number on the desktop?
On pre-release and Windows Insider builds, a visible desktop watermark displaying your build number is shown at the lower-right corner of the desktop screen.
How do I check my Windows core version and channel settings?
Go to Settings > Windows Update > Windows Insider Program to view your core version and click Choose your Insider settings to review your active channel.
Where can I view app version numbers in Windows 11?
Go to Settings > Apps > Installed apps to see version numbers listed at the top level for packaged applications.
Why does my build number matter for Windows Insider Preview updates?
Insider Preview builds rely on flight certificates that expire periodically. For example, older builds must update to Build 26300.9032 or later before August 11, 2026, to ensure the device continues receiving future updates.
Checked against Microsoft's release notes on ; re-checked when a new build ships.
Writes Thea's how-to guides for new and changed Windows 11 features: where a setting moved, how to turn it on or off, and what it actually does. Every guide is checked against Microsoft's release notes and updated when a new build changes the steps.
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