How to Free Up Disk Space on Windows 11

A full drive is not just an inconvenience. Windows needs free space to install updates, to page memory, to build restore points and to handle temporary files, so a system drive running near capacity gets slow, refuses updates, throws odd errors and eventually starts failing at things that have nothing obviously to do with storage.

The good news is that most machines are carrying several gigabytes of things nobody needs, and clearing them is safe, free and takes about fifteen minutes.

Where we are coming from: Software Kings sells Microsoft licences. There is a short section near the end about how updates and disk space interact, which is where our product is genuinely relevant. Everything else here is free and built into Windows.

How much free space should you actually have?

The common advice of “10 to 15 percent free” comes from the era of mechanical hard drives. For a modern SSD running Windows 11, a more practical target is a fixed amount rather than a percentage.

• Below 10 GB free: you are in trouble. Updates will fail and the system will feel sluggish.
• 20 GB free: workable, enough room for a feature update to install.
• 50 GB or more free: comfortable, with room for temporary files and future updates without thinking about it.

Feature updates in particular need a substantial amount of temporary working space, which is why a machine that has been fine for months suddenly refuses to update. If updates are failing on your PC, low disk space is one of the first things to check, alongside the causes in our guide on what to do when Windows Update gets stuck.

Step 1: Find out where the space has gone

Do this before deleting anything. Guessing wastes time and people usually guess wrong.

1. Press Windows + I, then go to System, Storage.
2. Wait for it to finish calculating. You get a breakdown by category: Apps and features, Temporary files, Documents, Pictures, and so on.
3. Click Show more categories to see everything, including System and reserved.
4. Click into whichever category is largest to see the detail.

This tells you whether you are dealing with a genuine storage problem, meaning your own files really do fill the drive, or an accumulation problem, meaning Windows is holding on to things it no longer needs. The fix is different for each.

Step 2: Clear temporary files, including the big one

This is where most of the easy space is.

1. In Settings, System, Storage, click Temporary files.
2. Review the list carefully and tick what you want removed.
3. Click Remove files.

What each significant category actually is:

Category	Typical size	Safe to remove?
Previous Windows installation(s)	15 to 25 GB	Yes, but you lose the ability to roll back the last feature update
Windows Update Cleanup	2 to 8 GB	Yes, these are superseded update files
Temporary files	1 to 5 GB	Yes
Delivery Optimisation Files	1 to 5 GB	Yes, they regenerate as needed
Recycle Bin	Varies	Check it first, deletion is permanent
Downloads	Varies, often large	Only after checking, these are your files
Thumbnails and temporary internet files	Small	Yes, they rebuild automatically

Step 3: Turn on Storage Sense so it maintains itself

Storage Sense is the built in automation that keeps the drive from filling up again. It is off by default on many machines, which is a shame because it removes the need to ever do this manually again.

1. Go to Settings, System, Storage.
2. Switch Storage Sense on, then click into it to configure.
3. Set it to run During low free disk space, or weekly if you want it more aggressive.
4. Set Delete files in my Recycle Bin if they have been there for over to 30 days.
5. Consider leaving Delete files in my Downloads folder set to Never, unless you are disciplined about moving things out of Downloads.

Step 4: Uninstall what you do not use

Go to Settings, Apps, Installed apps and sort by size. The list is usually revealing: old games, trial software that came with the PC, applications installed once for a single task and never opened again.

On a machine bought pre-built, this is also where the manufacturer bloatware lives. Trial antivirus suites, promotional apps and duplicate utilities can account for several gigabytes between them, and removing them speeds the machine up as well as freeing space. Keep the genuinely useful items such as audio utilities and official driver managers.

On the antivirus question specifically, most people do not need a third party suite on top of what Windows already includes, though there are situations where one makes sense. Our antivirus and security catalogue covers the options if you decide you want more than the built in protection.

Step 5: Find the large files hiding in your own folders

If Windows itself is not the problem, your own files are, and they are rarely where you expect. Video, disk images and old backups are the usual culprits.

To find them without installing anything:

1. Open File Explorer and click This PC.
2. In the search box, type size:gigantic and press Enter. This finds files over 4 GB. Use size:huge for files between 1 and 4 GB.
3. Sort the results by size and work through the top of the list.

Common finds: old ISO files from a Windows installation you did months ago, video exports, virtual machine disks, and installers for software you already installed. All safe to delete once you have confirmed what they are.

Step 6: Move files to the cloud or an external drive

If your own documents and photos genuinely fill the drive, deleting is not the answer, relocating is.

• OneDrive Files On-Demand keeps files visible in File Explorer while storing them in the cloud rather than on the drive. Right click a folder and choose Free up space to convert its contents to online only. The files stay accessible and download on demand when you open them.
• An external drive is the cheapest way to move a large photo or video library off the system drive permanently.
• A second internal drive, if the machine has room, lets you keep games and media off the boot drive entirely.

Whatever you move, keep a backup. Moving files off the system drive is not the same as backing them up, and a single copy on one external drive is one failure away from gone. If something does disappear, our guide on recovering unsaved Office files covers the Office side of that problem.

Step 7: Advanced options, with the caveats

These free up real space but each has a trade you should understand before doing it.

Reduce System Restore’s allocation. Restore points can occupy several gigabytes. Search for “Create a restore point”, select your drive, click Configure, and lower the maximum usage to around 5 percent. Do not disable protection entirely, because System Restore is genuinely useful when an update goes wrong.

Clear the Windows.old folder if it survived the temporary files cleanup. This is the same rollback copy described above and it disappears on its own after 10 days, so in most cases waiting is easier than intervening.

Hibernation file. On a desktop that never hibernates, hiberfil.sys can be several gigabytes. It can be disabled from an administrator terminal, but doing so also removes Fast Startup, so on a laptop it is usually not worth it.

Does free space actually make a PC faster?

Partly, and it is worth being precise about it rather than repeating the usual claim.

A drive that is nearly full does slow down, because Windows has less room for paging and temporary files and because SSDs need free blocks to write efficiently. Going from 2 GB free to 40 GB free will produce a noticeable improvement.

Going from 200 GB free to 400 GB free will not. Beyond a comfortable margin, extra free space does nothing for performance, and if your PC is slow with plenty of storage available, the cause is elsewhere: startup programs, background processes, an ageing drive or a driver problem. Our guides on speeding up Windows 11 and on a PC that got slow after an update cover those causes properly.

Where the licence comes into it

Honestly: activating Windows will not create disk space, and if you are here because your drive is full, everything you need is above this line.

There is one connection worth knowing about. Feature updates need a significant amount of free working space to install, and they also need the machine to be receiving updates in the first place. Installs that are unactivated or activated with a bypass tool frequently have updates failing or blocked, which produces a specific and confusing situation: the drive fills with partially downloaded update files that never install and never clean themselves up, and the machine gets slower while nothing appears to be happening.

If that sounds like your PC, the disk cleanup will help temporarily but the underlying problem is the update pipeline. We covered why bypassed installs end up in that state in our analysis of Windows activators and the risks around them, and a genuine key resolves it for less than most people expect:

Licence	Price	Best for
Windows 11 Pro (Retail)	$15.00	Transfers to a new PC, includes BitLocker
Windows 11 Home (OEM)	$10.00	A single home machine
Windows 11 Pro plus Office 2024	$26.50	Licensing the OS and Office together

The OEM versus Retail comparison covers which type suits your machine. If you are reinstalling from scratch rather than cleaning up, the USB installation guide walks through it including activation.

Frequently asked questions

How do I free up disk space on Windows 11 quickly?

Go to Settings, System, Storage, Temporary files, tick the categories and click Remove files. On most machines this recovers several gigabytes in a couple of minutes, and the largest single item is usually the previous Windows installation left behind by a feature update.

How much free space does Windows 11 need?

Aim for at least 20 GB free so feature updates can install, and 50 GB or more for comfort. Below 10 GB the system becomes unstable, updates fail and performance drops noticeably.

Is it safe to delete “Previous Windows installation(s)”?

Yes, with one consequence: you lose the ability to roll back to your previous Windows version. If the last feature update installed weeks ago and everything works, deleting it is a safe way to recover 15 to 25 GB. If it installed very recently and something feels wrong, wait.

What is Storage Sense and should I turn it on?

It is the built in automation that clears temporary files and empties the Recycle Bin on a schedule. Turning it on means the drive maintains itself. Set it to run during low free disk space, and leave the Downloads folder option set to Never unless you regularly move files out of there.

Is it safe to delete everything in the Temporary files list?

Almost all of it, with two exceptions to check first. Downloads contains files you saved deliberately, not temporary ones, and Recycle Bin deletion is permanent. Look inside both before ticking them. The rest, including update cleanup and delivery optimisation files, is safe.

How do I find what is taking up space on my drive?

Settings, System, Storage shows a breakdown by category. For large individual files, open File Explorer, click This PC, and search for size:gigantic to find anything over 4 GB, or size:huge for files between 1 and 4 GB.

Does freeing up disk space make my computer faster?

Only up to a point. Going from nearly full to comfortably free makes a real difference, because Windows needs room for paging and temporary files and SSDs need free blocks to write efficiently. Beyond a healthy margin, more free space does nothing, and slowness with plenty of space free has a different cause.

Should I use a PC cleaner or registry cleaner?

No. They recover very little space, they occasionally break things, and the categories they clean are handled safely for free by Settings and Storage Sense. Everything in this guide uses tools already built into Windows.

Why does my drive fill up again after I clean it?

Usually update files, temporary files from applications, and browser caches accumulating normally. Turning on Storage Sense handles that automatically. If it refills unusually fast, check whether Windows Update is repeatedly downloading something that never installs successfully.

Can I move Windows itself to a bigger drive?

Yes, by cloning the drive or by doing a clean install on the new one. A clean install is more reliable and gives you a fresh system, and a Retail licence transfers to the new hardware without difficulty.

In short

Look at Storage first so you know what you are dealing with, clear temporary files including the previous Windows installation, turn on Storage Sense so you never have to do it again, uninstall what you do not use, and find the oversized files hiding in your own folders with a size search.

That covers almost every case, uses nothing but tools already on the machine, and takes about fifteen minutes. If the drive is genuinely full of your own files, the answer is moving them rather than deleting them, and the cloud or an external drive is cheaper than the time you would spend agonising over what to throw away.

Sources: Microsoft Support, free up drive space in Windows; Microsoft Support, manage drive space with Storage Sense; Microsoft Support, Windows 11 system requirements; Microsoft Support, save disk space with OneDrive Files On-Demand.
Reviewed by Alex Bouchard, Director of Enterprise Solutions and Licensing. Last updated: September 2026.
Disclosure: Software Kings sells Microsoft licences. Every cleanup method in this article uses free tools already built into Windows.