- Windows 11 includes tools like Storage and Storage Sense to see what's taking up space and automate some of the cleanup.
- File Explorer, Settings, and Control Panel allow you to locate files and programs that consume the most space.
- Third-party applications such as WinDirStat and SpaceSniffer provide a very detailed visual view of disk usage.
- Combining manual, automated cleaning and external tools helps keep the disk optimized and avoid space problems.
Over time, any PC's hard drive fills up with files we no longer need : old downloads, installers, duplicate copies of photos, huge videos, programs you no longer use… All of this gradually accumulates, and eventually your computer starts to slow down or you run out of space to install games, programs, or Windows 11 updates. It's important to understand what a hard drive is for.
The usual approach is to delete a few large files at random and think that's enough, but often the storage remains practically full . To truly understand what's taking up space on your disk ( both SSD and HDD ), you need to combine Windows 11 tools with some specialized utilities that show you the actual size of folders, applications, and files.
Why it's important to know what takes up space in Windows 11
On a modern computer, storage is almost as critical as RAM or the processor . If the disk is at its limit, Windows 11 has less capacity to create temporary files, install patches, or move data, resulting in occasional crashes, extremely long loading times, and update errors.
Furthermore, when you understand where your storage space is actually going, you can make informed decisions: perhaps you have 4K videos that could be moved to an external drive, a duplicate music library, or piles of temporary files that serve no purpose. It's not just about deleting for the sake of deleting, but about distinguishing what can be safely removed from what should be kept.
Keep in mind that not everything that takes up space is obvious at first glance . Often the problem isn't your documents, but rather large applications, games you no longer play, temporary system files, copies of installers, or even emails and maps downloaded for offline use.
Fortunately, Windows 11 has several built-in features to see a breakdown of disk usage and detect those "culprits" of wasted space, and you can also rely on external programs that show everything visually and very clearly.
View used and free disk space in Windows 11 from Settings
The first thing you should do is check how much space you have used and free on each drive . Windows 11 offers a very convenient panel that shows this overall and also broken down by category. If you see that the system warns you about low space, you can find out how to remove the low space warning.
To access this view, open the Settings app . You can do this by pressing the Windows key + I , using the Start menu, or via the gear icon if it's conveniently located on the taskbar.
Once in Settings, go to the "System" section . This is where almost all the computer's general settings are grouped: display, sound, notifications, power... and also storage.
In the left-hand menu, click on "Storage" . You will see a list of all your storage drives: the main drive where Windows is installed, any other internal drives you may have, and also any connected external drives such as flash drives or USB hard drives.
For each drive, Windows 11 displays a bar showing the used and available space . If you select your primary drive, the system will load a statistics screen that breaks down storage usage by content type: apps and games, system and reserved files, temporary files, documents, pictures, videos, email, maps, and more.
This process may take a few seconds, but once it's finished, you'll have a very clear overview of how your storage space is being used . By clicking on each category (for example, "Apps & features" or "Temporary files"), you'll enter another window where you can see more details and, in many cases, take direct action to free up space.
Use the Storage Sensor to automate part of the cleaning
In addition to showing what's taking up disk space, Windows 11 includes a feature called Storage Sense that helps you delete unnecessary files periodically without having to constantly monitor it.
To access this option, go back to Start > Settings > System > Storage . Within this section, scroll down until you find the "Storage Sense" section . Here you'll see a toggle switch that allows you to turn this feature on or off.
If it's turned off, turn on Storage Sense . From there, you can access its detailed settings to specify how you want it to behave: how often it runs, what types of files it deletes, and how long it keeps them before deleting them.
In the "Run Storage Sense" field , you can select how often to run it: daily, weekly, monthly, or only when space is running low. This option is very useful if you frequently work with your hard drive nearly full and want Windows to clean up when it detects that you're running low on space.
Below you'll find specific sections like Recycle Bin and Downloads . In Recycle Bin, you can define how often its contents will be automatically deleted: every day, every 14 days, every 30 days, every 60 days, or never. The same applies to the Downloads folder, which tends to fill up with installers, PDFs, and other files you only use once, taking up gigabytes of space without you even noticing.
Finally, from this same panel you can run Storage Sense immediately to perform a cleanup right then and there, without waiting for the scheduled interval. This is especially useful when you see you're running out of space just before installing a large program or game.
Check which apps are taking up the most space in Windows 11
It's not all the fault of personal files: often it's applications and programs that inflate disk usage the most . Heavy games, video editing suites, development environments… it's a good idea to keep track of which programs are the biggest disk hogs to decide if it's worth having them installed.
You can get a detailed list from the Settings app itself. Go back to Settings > System > Storage and, within the storage breakdown, go to the "Apps & features" or "Installed apps" option, depending on your version of Windows 11.
You'll see a list of all the apps installed on your computer, along with the size of each one . You can sort this list by size using the drop-down menu or sorting options, so that the apps that take up the most space appear first.
If you want to refine your search even further, you can filter by storage drive using the corresponding menu. This is very useful if you have multiple partitions or disks and want to know exactly which applications are installed on each one.
When you notice an app taking up too much space, you have several options: uninstall it directly from the list, move it to another drive (if the app allows it), or check if it has internal options to delete cached or temporary data. You could also use third-party tools (such as Revo Uninstaller, IObit Uninstaller, or CCleaner) for a more thorough uninstallation to remove any remaining files.
Control Panel: Another way to view program sizes
Although Microsoft is migrating almost everything to the Settings app, the classic Control Panel is still available in Windows 11 and is useful for some tasks, including viewing the size of traditional desktop programs.
To open it, click the search icon on the taskbar , type "Control Panel," and select the first result. You can also find it from the Start menu.
Once inside, change the view in the upper right corner to "Large icons" (or small icons) to see all sections clearly. Then, click on "Programs and features".
This window will display a standard list of programs installed on your computer . If the "Size" column is not visible, right-click on the column headers (where it says Name, Publisher, Installed on…) and select the "Size" option to add it.
Clicking on the size column header lets you sort programs by the space they occupy . This allows you to quickly see which desktop applications are the heaviest and decide whether it's worth keeping them installed or uninstalling them to free up several gigabytes of space.
Use "Apps & Features" to quickly manage programs
Another way to check app storage space in Windows 11 is to go directly to the "Apps" section in Settings , instead of going through the Storage menu.
To do this, open Start > Settings > Apps and go to "Installed apps" or "Apps & features" (the name varies depending on your Windows 11 build). There you'll see all the apps again, along with their size, installation date, and other options.
As before, you can sort by size so that the apps that take up the most space appear first. From each entry, you can uninstall, move, or modify the app (if the developer offers this option).
This same section is used by Microsoft when, for example, Storage Sense suggests you review your heaviest applications . In fact, the Windows 11 Storage panel includes a "Cleanup Recommendations" section where the system shows you suggestions for files and apps you could remove with just a few clicks.
See which files are taking up the most space using File Explorer
If you're looking to locate large personal files such as videos, photos, music, and documents , the most straightforward method is to use the good old File Explorer.
On the taskbar, click the File Explorer icon and, in the left panel, go to "This PC" . From there, you can open the user's main folders: Videos, Music, Pictures, Documents, Downloads... These are usually where the largest files are stored.
To quickly see the file sizes in a folder, switch to "Details" view . You can do this from the top (view tab or view icon, depending on the version) by selecting the details option, where the size column appears among others.
Once you're in Details view, right-click in the empty space within the file list and select "Sort by > Size". This will move the largest files to the top, making it easier to quickly locate the biggest ones.
Another very useful option is to use Explorer's search box. Type any text to activate the "Search" tab , and then use the "Size" filter to choose categories like "Small," "Medium," "Large," "Giant," etc. This will filter the results by size , allowing you to see only very large files in the folder or drive you're exploring.
When you identify files you no longer need, you can delete them directly or, if you prefer to keep them but free up internal disk space, move them to a USB drive, SD card, or external hard drive. This way, you'll still have them available when you connect that device, but they won't take up space on your PC.
How to move files to an external drive to free up space
In many cases, you don't want to delete photos, videos, or music, but you do want to free up space on your internal SSD or HDD . The best solution then is to move those files to an external hard drive.
The process is simple: First, connect a USB drive, external hard drive, or SD card to your Windows 11 computer. Wait for the system to recognize it and for it to appear in "This PC" as a new drive.
Next, open File Explorer and go to the folder where the files you want to move are located (for example, Pictures, Videos, or Downloads). Select the files or folders you want to move: you can use the Ctrl or Shift keys to select multiple items at once.
With the files selected, click the "Cut" option at the top , or right-click and select "Cut" from the context menu. Then, navigate to the drive letter of the external drive in "This PC," open or create a folder where you want to save them, and click " Paste . "
This way, the files will be physically moved to the external drive . They will no longer take up space on your internal drive, but will remain accessible whenever the external device is connected. It's a great way to keep content you don't use daily readily available without filling up your main drive.
Analyze disk usage with WinDirStat
When you want to go a step further and see exactly what's taking up space on every corner of your disk , third-party tools are a great help. One of the best-known and longest-running is WinDirStat , a free and open-source program.
After downloading and installing WinDirStat, open it and choose the drive you want to analyze (for example, your C: drive). The program will scan the entire disk structure and, when finished, will present you with an interface with three main sections.
In the upper left corner, you'll see a directory tree where each folder and subfolder is displayed along with its size and percentage of total space. This allows you to quickly identify which directories are taking up the most space.
The lower section of the window displays a map of colored blocks (known as a treemap): each rectangle represents an individual file, and the block size is proportional to the disk space it occupies. The colors are assigned by file type, so you can quickly see if, for example, you have many videos, images, or large executable files.
When you place the cursor over any block in that map, WinDirStat displays detailed information about the file : name, exact path, size, type… You can also select a folder in the top tree and see only the blocks corresponding to its contents.
If you identify a file you want to delete, simply right-click on it and choose the delete option . This way, you can delete large files directly from the tool itself, although it's always a good idea to know exactly what you're deleting to avoid accidentally removing something important from your system.
Analyze the disk with SpaceSniffer
Another very popular utility for visualizing how disk space is allocated is SpaceSniffer . Unlike WinDirStat, this tool stands out for displaying everything in a single, very intuitive graphical panel, without a traditional directory list.
After downloading SpaceSniffer from its official website (it usually works even without full installation), run it and choose the drive you want to scan . The program will begin drawing a series of rectangles on the screen representing folders and files.
In SpaceSniffer, larger folders typically appear in a brownish tone and are subdivided into smaller blocks corresponding to their contents. Files are usually displayed in blue, and the entire display adapts as the analysis progresses.
The beauty of SpaceSniffer is that you can double-click on any folder to "go inside" it and see its subfolders and files in detail, always visually ordered according to their size.
This way, you can drill down as deeply as you like, pinpointing in just a few minutes which specific files are taking up space in each area of the disk. If a blue block stands out because of its size, it's probably a video, an ISO image, or a very large compressed file.
When you find files or groups of files that you know you don't need, you can right-click on them and choose "Delete" to remove them directly from the tool. In a matter of seconds, the space occupied by those blocks will be freed up, and the chart will be reorganized to reflect the new situation.
When to use external tools and when to stick with Windows tools
Windows 11's built-in tools (Storage, Storage Sense, Explorer, Apps & features, Control Panel…) are more than enough for most users who just want to do a little cleaning , remove heavy programs and organize personal files.
However, if you notice that your disk is still full, that space is "disappearing" for no apparent reason, or you want a much deeper analysis, WinDirStat and SpaceSniffer are almost indispensable tools . They allow you to see things that would go unnoticed in the standard Windows interface, such as folders lost in unusual locations, accumulations of temporary files, old backups of data, and so on.
It's also important to remember that the Windows system and reserved files occupy a significant portion of your disk space, which shouldn't be touched lightly . Even if the "System and reserved" section appears large, you shouldn't delete anything directly from there except for the safe options offered by the system itself (for example, cleaning temporary files or files from previous versions of Windows ).
By combining these options, you can control both the space used by your applications (whether they're Microsoft Store apps or traditional programs) and the size of your personal files and system data . The result is a computer with more breathing room, fewer problems when updating, and, overall, smoother performance.
Taking a few minutes from time to time to check your storage using Windows 11 tools, and if necessary, using programs like WinDirStat or SpaceSniffer, is the best way to avoid unpleasant surprises when your disk fills up at the worst possible moment and to keep your PC tidy, lightweight, and ready for whatever you ask of it.
