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How to Remove Junk Files from Computer Windows 10 & 11 (Complete Guide)

Over time, every Windows computer collects unnecessary files that consume valuable storage space and reduce system performance. These unwanted files are commonly known as junk files.

When you use your computer for everyday activities such as browsing websites, installing applications, downloading files, watching videos, or updating Windows, many temporary files are created automatically.

Some of these files are useful for a short period, but after completing their purpose, they remain stored on your hard drive. As these files continue to build up, your computer may become slower, applications may take longer to open, and Windows may display low disk space warnings.

The good news is that you can safely remove junk files from your computer using built-in Windows tools. You do not always need expensive cleaning software.

In this complete guide, you will learn:

• What junk files are
• Different types of junk files
• How junk files are created
• How junk files affect computer performance
• How to remove junk files from Windows 10 and Windows 11
• How to prevent junk files from building up again

Table of Contents

• What Are Junk Files?
• Why Does Your Computer Create Junk Files?
• Main Types of Junk Files
• How Junk Files Affect Computer Performance
• How to Remove Junk Files from Windows 10 & 11
• How to Prevent Junk Files
• Frequently Asked Questions

What Are Junk Files?

Junk files are unnecessary files stored on your computer that are no longer needed by Windows, applications, or users.

These files are usually created during normal computer activities. For example:

• Opening websites creates browser cache files.
• Installing software creates setup files.
• Running applications creates temporary system data.
• Windows updates create installation files.
• Deleted files remain inside the Recycle Bin.

A few junk files may not create noticeable problems. However, when thousands of unnecessary files accumulate over months or years, they can take up large amounts of storage space.

A computer with a small SSD or HDD can experience performance problems much faster because Windows needs enough free space to operate correctly.

Regular junk file cleanup helps you:

• Free up hard drive space
• Improve Windows performance
• Reduce system errors
• Make applications run faster
• Keep your computer organized

Why Does Your Computer Create Junk Files?

Many users ask:

"Why does my computer create junk files automatically?"

The answer is simple. Junk files are created as a result of normal computer operations.

Whenever Windows or an application performs a task, temporary files may be created to complete that process.

Examples include:

• A web browser saves website data to load pages faster.
• Windows creates temporary files during updates.
• Programs create temporary data while running.
• Installation packages are created during software setup.
• Applications save logs and error reports.

After the task is completed, many of these files are no longer useful. However, Windows does not always remove all temporary data automatically.

Over time, these unnecessary files collect on your storage drive and create digital clutter.

Main Types of Junk Files

There are several types of junk files created on Windows computers. Understanding these files helps you remove unnecessary data safely.

1. Temporary Internet Files (Browser Cache)

Temporary Internet Files are also known as browser cache files.

When you visit websites, your browser stores different types of data on your computer, including:

• Images
• Videos
• Website scripts
• Cookies
• Page elements

The purpose of cache files is to help websites load faster when you visit them again.

For example, if you frequently visit a website, your browser may already have some images and files stored locally. This reduces loading time.

However, if you visited a website only once, those cached files may never be used again.

Large amounts of browser cache can cause:

• Reduced storage space
• Browser slowdown
• Outdated website information
• Loading problems

Cleaning browser cache regularly helps maintain better browsing performance.

2. Temporary System Files

Temporary system files are created by Windows while performing different operations.

These files may include:

• Windows installation files
• Update files
• Error reports
• System logs
• Application temporary data

These files help Windows complete important tasks. However, after the task is completed, many temporary files are no longer required.

For example, when Windows installs an update, it may create temporary installation files. After the update finishes successfully, some files may remain stored on your drive.

Removing unnecessary temporary system files can recover valuable disk space.

.3. Installer Files

Installer files are created when you install programs and applications on your computer.

They may include:

• Setup files
• Installation packages
• Temporary installation data

During installation, Windows uses these files to copy program files and complete the setup process.

After installation is completed, many installer files become unnecessary.

Always download programs from trusted sources because some free applications may include:

• Unwanted browser extensions
• Additional software
• Advertising programs
• Potentially unwanted programs (PUPs)

4. Thumbnail Files

Windows automatically creates thumbnail files to display previews of pictures, videos, and documents. These small preview images help folders open faster because Windows does not need to generate previews every time you open a folder.

For example, when you open a folder containing hundreds of photos, Windows displays small image previews instead of only showing file names.

Although thumbnail files are useful, Windows may keep thumbnail data for files that no longer exist. Over time, this thumbnail cache can become unnecessary junk.

Deleting thumbnail files is completely safe. Windows will automatically create new thumbnail files when required.

5. Deleted Files and Recycle Bin Files

Many users believe that deleting a file immediately removes it permanently. However, Windows usually moves deleted files to the Recycle Bin first.

Until you empty the Recycle Bin, those files continue to occupy storage space on your hard drive.

Examples of deleted junk files include:

• Old documents
• Deleted videos
• Unused downloads
• Duplicate files
• Old installation files

A large recycle bin can consume several gigabytes of storage. Regularly emptying it is one of the easiest ways to recover disk space.

How Junk Files Affect Computer Performance

Many users ignore junk files because they do not immediately notice a problem. A few temporary files may not affect your computer, but thousands of unnecessary files can slowly reduce performance.

Junk files mainly affect your computer by reducing available storage space and making Windows work harder.

Let us look at the common problems caused by excessive junk files.

1. Reduced Hard Drive Space

One of the biggest problems caused by junk files is reduced storage space.

Every computer has limited storage capacity. Whether you use a traditional hard drive (HDD) or a solid-state drive (SSD), Windows requires enough free space to work properly.

The C: drive is especially important because it usually stores the following:

• Windows operating system files
• Installed programs
• Windows update files
• User profile data
• Temporary files

When the C drive becomes almost full, you may experience:

• Slow computer performance
• Failed Windows updates
• Software installation errors
• System freezing

Try to keep enough free space on your Windows drive for better system performance.

2. Computer Crashes, Errors, and Blue Screen Problems

If your computer frequently crashes or displays Blue Screen errors (BSOD), insufficient storage space can sometimes be one of the reasons.

Windows needs free storage space to:

• Create temporary system files
• Save crash reports
• Complete Windows updates
• Manage background processes

When there is not enough free space, Windows may fail to complete important operations.

Possible symptoms include:

• Unexpected restarts
• Application crashes
• Windows update failures
• Installation errors
• Blue screen messages

Removing unnecessary files can help prevent storage-related problems.

.3. Slower File Processing

Have you noticed that your computer takes longer to open folders, search files, or organize data?

A large number of unnecessary files can slow down file management tasks.

Windows may need more time to:

• Search through files
• Create file indexes
• Display folders
• Manage temporary data

Regular cleanup helps Windows find and process important files faster.

4. Low Disk Space Notifications

Windows includes a warning system that alerts users when storage space becomes low.

You may see a message like the following:

"You are running out of disk space on Local Disk (C:)."

This warning should not be ignored because low storage can affect the following:

• Windows updates
• Application performance
• System stability
• File saving operations

Removing junk files is one of the easiest ways to recover storage space.

5. Browser Freezing and Slow Internet Browsing

Web browsers store temporary files every time you visit websites.

Over time, browser cache can become very large and may create performance problems.

Too much cached data can cause:

• Slow browser startup
• Web pages loading incorrectly
• Browser freezing
• Outdated website information

Cleaning browser cache and temporary internet files can improve browsing performance.

Related article: How to Fix Google Chrome Not Responding on Windows

How to Remove Junk Files from Computer Windows 10 & 11

There are several safe ways to remove junk files from your computer.

Windows already includes powerful cleanup tools, so you do not always need third-party cleaning applications.

The safest cleanup methods are:

1. Disk Cleanup Tool
2. Windows Temporary Files Settings
3. Storage Sense
4. Manual Temporary Folder Cleanup
5. Command Prompt Cleanup Commands
6. Emptying Recycle Bin
7. Browser Cache Cleanup

Method 1: Remove Junk Files Using Windows Disk Cleanup

Disk Cleanup is a built-in Windows tool designed to remove unnecessary files from your computer.

It can delete:

• Temporary Internet Files
• Windows temporary files
• Delivery Optimization files
• Recycle Bin contents
• Thumbnail files
• Old update files

Disk Cleanup is available in the following:

• Windows 11
• Windows 10
• Windows 8
• Windows 7

Steps to Open Disk Cleanup

Step 1:

Click the Windows Search box on the taskbar.

Type:

Disk Cleanup

Open Disk Cleanup from the search results.

Continue Disk Cleanup Steps

Step 2:

Select the drive you want to clean.

Usually, this is:

C:

Click:

OK

Windows will calculate how much storage space can be recovered.

Step 3:

Under Files to delete, select the types of files you want to remove.

Common safe options include:

• Temporary Internet Files
• Temporary Files
• Thumbnails
• Delivery Optimization Files
• Recycle Bin

After selecting the files, click the following:

OK → Delete Files

Windows will permanently remove the selected junk files.

Remove More Junk Files Using Clean Up System Files

The normal Disk Cleanup option removes common temporary files. However, Windows also provides an advanced option called Clean up system files.

This option can remove additional unnecessary files, including:

• Windows Update Cleanup files
• Previous Windows installation files
• Device driver packages
• Temporary Windows installation files

Steps to Clean System Files

1. Open Disk Cleanup.
2. Select your Windows drive.
3. Click Clean up system files.
4. Select the drive again.
5. Choose the files you want to remove.
6. Click OK.

Important: Be careful when deleting Previous Windows installation(s). This removes old Windows files created after a major upgrade and may prevent you from returning to the previous Windows version.

Method 2: Delete Temporary Files to Remove Junk Files

Windows stores temporary files in special folders while applications and system processes are running.

Many of these files are no longer needed after completing their tasks.

Steps to Delete Temporary Files

Step 1:

Press:

Windows Key + R

to open the Run dialog box.

Step 2:

Type:

%temp%

Click:

OK

Step 3:

The Windows Temp folder will open.

Press:

Ctrl + A

to select all files.

Press:

Delete

to remove temporary files.

Some files may show a message:

"The action cannot be completed because the file is open."

This is normal. Click Skip because those files are currently being used by Windows or another program.

Method 3: Automatically Remove Junk Files Using Storage Sense

Windows 10 and Windows 11 include a useful feature called Storage Sense.

Storage Sense automatically removes unnecessary files and helps keep your computer storage clean.

It can clean:

• Temporary files
• Recycle Bin files
• Old update files
• Unused temporary data

How to Enable Storage Sense

1. Open Settings.
2. Go to System → Storage.
3. Turn on Storage Sense.
4. Click Configure Storage Sense or run it now.
5. Select your preferred cleanup options.

Recommended settings:

• Delete temporary files automatically
• Empty Recycle Bin after a selected period
• Remove unused files from Downloads (optional)

Method 4: Remove Junk Files Using Command Prompt

Advanced users can use Command Prompt to run Windows Disk Cleanup automatically.

Open Command Prompt as Administrator

1. Click the Windows Start button.
2. Type Command Prompt.
3. Right-click Command Prompt.
4. Select Run as administrator.

Create Disk Cleanup Settings

Type the following command:

cleanmgr /sageset:1

Press Enter.

Select the cleanup categories you want Windows to remove.

Run Automatic Disk Cleanup

Use this command:

cleanmgr /sagerun:1

Windows will automatically clean the selected junk files.

Quick Disk Cleanup Command

For quick cleanup, run:

cleanmgr /lowdisk

This command is useful when Windows shows a low disk space warning.

Method 5: Delete Temporary Files Using Command Prompt

You can also open and clean temporary folders using Command Prompt.

Open Temporary Folder

%SystemRoot%\explorer.exe %temp%\

This command opens the Windows temporary folder.

Delete Temporary Files

del %temp%\*.* /s /q

Command explanation:

• del = delete files
• /s = remove files from subfolders
• /q = quiet mode without confirmation

Warning: Never delete unknown files from Windows system folders. Only remove files from safe temporary locations.

Continue to Part 4...

Method 6: Clear Browser Cache to Remove Junk Files

Web browsers create temporary files every time you visit websites. These files are called cache files and they help websites load faster.

However, when cache files become too large or outdated, they may cause:

• Slow browser performance
• Web pages loading incorrectly
• Browser freezing
• Old website versions appearing

Clearing browser cache regularly can help maintain better browsing performance.

Clear Google Chrome Cache

1. Open Google Chrome.
2. Press:

Ctrl + Shift + Delete

3. Select Cached images and files.
4. Choose the time range.
5. Click Clear data.

Clear Microsoft Edge Cache

1. Open Microsoft Edge.
2. Press:

Ctrl + Shift + Delete

3. Select Cached images and files.
4. Click Clear now.

Clear Mozilla Firefox Cache

1. Open Firefox.
2. Press:

Ctrl + Shift + Delete

3. Select temporary files.
4. Click Clear.

Method 7: Empty Windows Recycle Bin

When you delete files in Windows, they are normally moved to the Recycle Bin instead of being removed permanently.

Until you empty the Recycle Bin, deleted files continue using storage space.

Steps to Empty Recycle Bin

1. Go to the Windows desktop.
2. Right-click the Recycle Bin.
3. Select Empty Recycle Bin.
4. Click Yes.

Tip: Before emptying the Recycle Bin, check that you do not need any important deleted files.

Method 8: Remove Unused Programs and Applications

Installed applications can also become a source of unnecessary files.

Many users install programs and forget about them. These unused applications may continue consuming:

• Storage space
• Temporary data
• Update files
• Configuration files

How to Uninstall Unused Programs in Windows

1. Press:

Windows Key + I

2. Open Settings.
3. Go to Apps → Installed Apps.
4. Select unwanted programs.
5. Click Uninstall.

Removing programs you no longer use is an effective way to free up disk space.

Related article:

How to Prevent Junk Files From Building Up Again

Cleaning junk files once can improve your computer performance, but regular maintenance prevents the problem from returning.

1. Enable Storage Sense

Windows Storage Sense automatically removes unnecessary temporary files and helps maintain free storage space.

2. Install Software Carefully

Avoid downloading unknown programs from unreliable websites.

Some free software packages may include:

• Unwanted applications
• Browser extensions
• Advertising software
• Potentially unwanted programs (PUPs)

Always download applications from trusted official websites.

3. Regularly Clean Browser Cache

If you browse the internet frequently, clear your browser cache occasionally to remove old temporary internet files.

4. Keep Enough Free Disk Space

Avoid filling your Windows drive completely.

Try to keep at least 15% to 20% free space on your main drive.

Enough free space helps Windows:

• Create temporary files
• Install updates
• Manage virtual memory
• Run applications smoothly

5. Clean Your Downloads Folder

The Downloads folder often becomes a hidden storage problem.

Remove files you no longer need, such as:

• Old setup files
• Duplicate documents
• Large videos
• Unused ZIP files

Frequently Asked Questions (FAQ)

1. What are junk files on a computer?

Junk files are unnecessary files created by Windows, applications, and browsers during normal computer use. They include temporary files, cache files, old installation files, and deleted items.

2. Are junk files harmful to my computer?

Junk files usually do not directly damage computer hardware. However, large amounts of junk files can reduce storage space and slow down Windows performance.

3. How often should I remove junk files?

For most users, cleaning junk files once a month is enough. Users who frequently install software, download files, or browse the internet may need cleanup more often.

4. Is it safe to delete temporary files?

Yes. Most temporary files can be safely deleted because Windows and applications recreate them when needed.

5. Does removing junk files make my computer faster?

Yes. Removing unnecessary files can improve performance by freeing storage space and helping Windows operate more efficiently.

6. What is the best tool to remove junk files in Windows?

Windows built-in tools such as Disk Cleanup and Storage Sense are safe and effective options for removing junk files.

7. Can I delete Windows Update Cleanup files?

Yes, Windows Update Cleanup files can usually be removed after updates are successfully installed.

However, be careful when removing previous Windows installation files because they may be needed to restore an older Windows version.

8. Why does my computer keep creating junk files?

Junk files are created naturally whenever you:

• Browse websites
• Install applications
• Update Windows
• Run programs

Regular cleanup is necessary because new temporary files are always created.

Related Articles

Improve your Windows computer with these helpful guides:

• How to Fix Low Memory on Windows PC (Windows 11, 10, 8 & 7)
• Fix White Screen on Laptop Startup Windows 10 & 11
• Windows 10 No Bootable Device Found Error: Complete Fix Guide
• Windows 10 Search Not Working? Complete Fix Guide
• How to Check PC Specifications in Windows (CPU, RAM, GPU, BIOS)
• How to Fix DNS Server Not Responding Error in Windows 10 & 11

Final Thoughts

Junk files are a normal part of using any computer. Every time you browse websites, install software, download files, or update Windows, temporary data is created.

However, allowing these unnecessary files to accumulate for a long time can reduce available storage space and affect system performance.

By regularly using Windows tools such as:

• Disk Cleanup
• Storage Sense
• Temporary File Cleanup
• Command Prompt Cleanup

You can keep your Windows 10 or Windows 11 computer faster, cleaner, and more reliable.

Regular maintenance only takes a few minutes but can greatly improve your overall computing experience.