How to free up space on Windows 11 when it is full

When Windows 11 warns that a drive is almost full, the fastest calm fix is built in. Open Settings, go to System, then Storage, and Windows shows you exactly what is using the space and offers to clear the easy wins in one place. Everything below builds on that one screen, from a fully automatic cleanup to the gigabytes of old update files most people never think to look for.

See what’s using your space first#

Before deleting anything, find out where the space actually went. Open Settings > System > Storage (search for storage settings if the menu looks different on your build). The Storage page breaks your drive down by category — apps, temporary files, documents, and so on — so you can see whether the problem is junk or your own files.

Below that breakdown, Cleanup recommendations groups the safest things to remove: temporary files, large or unused files, cloud-synced files, and apps you rarely open. It shows an estimate of how much each will free before you delete anything, which makes it the single best starting point. Microsoft’s own walkthrough, Free up drive space in Windows, recommends working through these methods one at a time and checking your free space after each.

Category	What it usually is	Clear it?
Temporary files	Caches, leftover installers, update remnants	Yes, safe
Recycle Bin	Files you deleted but didn’t purge	Yes, once you’re sure
Apps and features	Installed programs and games	Uninstall the unused ones
Documents, Pictures, Videos	Your own personal files	Move them, don’t delete
System and reserved	Windows itself, paging, recovery	Leave it alone
Previous Windows installation	Windows.old rollback files	Yes, after the rollback window

Turn on Storage Sense so it stays clean#

Storage Sense is the automatic option. Once it’s on, it frees space for you by removing temporary files and emptying the Recycle Bin on a schedule, so the drive doesn’t creep back to full. Turn it on under Settings > System > Storage by setting Storage Sense to On.

By default it is conservative: it does not touch your Downloads folder or your OneDrive files unless you tell it to. Open its settings and you can choose how often it runs, how long items sit in the Recycle Bin before deletion, whether to clear old downloads, and whether unopened cloud files become online-only. One limit worth knowing, per Microsoft’s Storage Sense guide: it works on your system drive, usually C:. It won’t tidy a second drive for you.

Run Disk Cleanup for temporary and system files#

Disk Cleanup is the older tool that still reaches the deepest. Type disk cleanup in the taskbar search box and open it, choose the drive, select OK, then check the boxes next to the file types you want to remove. That first pass clears everyday clutter like temporary internet files and thumbnails.

To go further, select Clean up system files, pick the drive again, and Windows recalculates with extra categories added — the ones that tend to hold the most space. Microsoft’s reference for this is Disk Cleanup in Windows. If the machine still feels sluggish afterward, a full drive is only one cause among several — our guide to why a Windows PC runs slow walks through the rest in order.

Empty the Recycle Bin and uninstall apps you don’t use#

Deleting a file usually just moves it to the Recycle Bin, where it keeps occupying space until the bin is emptied. Right-click the Recycle Bin on the desktop and choose Empty Recycle Bin, or let Storage Sense handle it on a schedule. Do this before assuming a “deleted” folder actually freed anything.

For programs, open Settings > Apps > Installed apps, sort the list by size, and uninstall anything you no longer use — old games and trial software are common offenders. You can reach the same uninstall action straight from Cleanup recommendations, which flags apps you rarely open.

Move files to another drive or OneDrive#

If your own files are the problem rather than junk, the answer is to move them, not delete them. In File Explorer, drag large folders — video, photo libraries, downloads — onto a second internal drive or an external USB drive. To stop new files from landing back on the full drive, set Settings > System > Storage > Advanced storage settings > Where new content is saved to point at the roomier drive.

OneDrive offers a lighter touch. Its Files On-Demand feature replaces full-size local copies with online-only placeholders: the files still show in File Explorer, but the space returns to your drive until you open one. If you’re starting to wonder whether the real bottleneck is memory rather than storage, it’s worth learning how to tell if your PC needs more RAM before you spend anything.

Clear old Windows Update and previous-installation files#

After a large Windows update, the installer keeps your old version in a folder named Windows.old so you can roll back if something breaks. It is often the single largest reclaimable chunk on the drive. To remove it, use Disk Cleanup > Clean up system files and check Windows Update Cleanup and Previous Windows installation(s) if they appear.

One honest caveat: deleting the previous installation removes your ability to return to the earlier version of Windows, and it can’t be undone. That rollback option normally disappears on its own about ten days after an upgrade, so if you upgraded a while ago you’re clearing files you could no longer use anyway. If your upgrade decision is still ahead of you, our notes on what to do about Windows 10 end of support cover the timing.

Method	Roughly how much it frees	Effort
Cleanup recommendations	A few GB of temp and unused files	Low
Storage Sense (automatic)	Ongoing temp and Recycle Bin cleanup	Low, set once
Disk Cleanup (system files)	Medium to large	Low
Empty Recycle Bin	Whatever you’ve deleted	Low
Uninstall unused apps	Varies by app	Low
Move files or use Files On-Demand	As much as you move	Medium
Windows Update and Windows.old cleanup	Often the biggest single win	Low

Work down the list from the top and check the Storage page again after each step. Most people clear more than enough within the first two or three methods, and turning on Storage Sense means you won’t be back at the same warning next month.