Running out of disk space on Windows 10/11 can trigger low disk space warnings and interfere with updates. In many cases, you can reclaim space without buying a larger drive or paid software.
This guide covers five free ways to free up disk space, from Windows cleanup tools to partition management. If deleting files isn’t enough, you’ll also learn how to merge partitions to fix a full C drive.
Quick Summary: How to Free Up Disk Space?
Method 1: Clean Temporary Files – Automate cleanup through Settings > System > Storage to remove junk files with Storage Sense. [Windows Built-in Tool]
Method 2: Extend C Drive Capacity – Reallocate free space from the D/E drive to the C drive using EaseUS Partition Master.
Method 3: Remove System Junk – Delete system files, update backups, and Windows.old folders via Disk Cleanup. [Windows Built-in Tool]
Method 4: Clear Large Personal Files – Locate and remove big videos and archives using File Explorer or a disk space analyzer. [Windows Built-in Tool]
Method 5: Uninstall Unused Apps and Games – Free up storage by removing heavy software via Settings > Apps. [Windows Built-in Tool]
5 Free Ways to Free Up Disk Space on Windows
If you need to free up space on Windows 10/11 without spending money, start with these five methods.
1. Use Storage Sense to Clean Up Temporary Files
Storage Sense automatically removes temporary files and other items you no longer need, helping free up disk space.
Go to Settings > System > Storage > Storage Sense and turn it on. You can also select Run Storage Sense now to start a cleanup manually.
Based on your settings, Storage Sense can also manage items such as Recycle Bin contents, Downloads, and cloud storage.
Best for: Temporary files and routine cleanup.
2. Extend C Drive with Unallocated Space
Not every low disk space issue is caused by too many files. If your C drive is nearly full but another partition has plenty of unused space, you can combine them using the partition merge feature. For example:
| Partition | Total Space | Used Space |
|---|---|---|
| C: | 120 GB | 112 GB |
| D: | 500 GB | 200 GB |
In this case, deleting a few more temporary files may only be a short-term fix. EaseUS Partition Master, rated 4.9/5 on Trustpilot based on over 39,000 reviews, offers a free Merge feature that lets you directly combine adjacent partition space into your C drive.
- Right-click the C: drive and select Merge.
- Select the target partition (such as D:) whose space you want to combine into the C: drive, then click OK.
- Click Execute Task, then Apply to confirm the changes.
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Note: The exact steps may vary depending on your partition layout and whether the partitions are adjacent. Back up important files and double-check the selected partitions before you proceed.
Best for: A full C drive when another partition has enough unused space.
3. Use Disk Cleanup to Free Up Space
Search for Disk Cleanup in the Windows Start menu, select the drive you want to clean, and review the file categories to completely delete the Windows.old folder on Windows 10 to remove outdated OS backups.
You can typically remove standard items such as:
- Temporary files
- Thumbnails
- Downloaded Program Files
- Delivery Optimization Files
- Recycle Bin
Note: Be careful when removing Previous Windows installation(s). Deleting these files permanently removes the Windows.old folder and prevents you from rolling back to your previous version of Windows.
Best for: Removing temporary and system files identified by Windows as safe to delete.
4. Delete or Move Large Personal Files
Large videos, photos, downloads, installers, and other personal files can quickly consume C drive space. Instead of deleting files you still need, move them to another drive, external storage, or cloud storage.
Open File Explorer > This PC, check folders such as Downloads, Videos, Pictures, and Documents, and sort files by Size to find the largest ones first.
If you are not sure what is taking up the most space, a free disk space analyzer such as EaseUS Partition Master can help you visualize which files and folders use the most storage. Before deleting anything, make sure you no longer need the files or have a backup.
Best for: Finding large personal files and moving them off a crowded C drive.
5. Uninstall Apps You No Longer Use
Unused apps and games can take up significant disk space. Windows includes a built-in uninstall tool, so you do not need additional software for basic app removal.
- Press Windows + I to open Settings, then go to Apps.
- Windows 10 users: Select Apps & features.
- Windows 11 users: Select Installed apps.
- Browse through the list or sort apps by Size to locate heavy programs and games.
- Click the app menu (or the three dots) and select Uninstall, then follow the on-screen prompts.
Focus on large programs and games you no longer use, but avoid removing apps or system components if you are unsure what they do.
Best for: Freeing up space used by large, unused apps and games.
What If These Methods Aren’t Enough?
If your C drive is still nearly full after removing temporary files, deleting unnecessary data, and uninstalling unused apps, the problem may be how storage is allocated across your partitions.
EaseUS Partition Master provides additional disk management tools when basic file cleanup isn’t enough. Depending on your needs, you can adjust partition sizes, clean unnecessary files, or move apps and data to another drive.
- Allocate Space: Directly allocate space from one partition (such as D:) to another (such as C:) with a few clicks.
- Adjust Partition Space: Use the Extend/Shrink feature to increase the size of a partition.
- Clean Temporary Files: Remove temporary files, caches, and other leftovers taking up space.
- Move Apps and Data: Move apps or data to another drive when your C drive is running out of space.
Built-in Tools vs. EaseUS Partition Master
Windows tools can clean up files, while EaseUS offers more advanced disk space management.
| Feature | Windows Built-in Tools | EaseUS Partition Master |
|---|---|---|
| Clean temporary files | ✅ Available | ✅ Available |
| Extend C drive | ⚠️ Limited | ✅ Supported |
| Reallocate disk space | ⚠️ Limited | ✅ Supported |
| Move installed apps | ⚠️ Limited | ✅ Supported |
| Analyze disk space usage | ⚠️ Basic | ✅ Advanced |
| Partition management | ⚠️ Basic | ✅ Advanced |
Other Disk Management Features
Beyond freeing up storage, EaseUS Partition Master also provides tools for broader disk and system management.
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- Smart Diagnostics – Check and fix 13 common disk and system issues in one click, including disk errors, boot problems, and low disk space.
- Clone Disk – Clone an entire disk or partition to migrate data or transfer Windows to a new SSD/HDD without reinstalling the operating system.
- Convert MBR to GPT – Convert between MBR and GPT partition styles when needed.
- Create a WinPE Bootable Disk – Create bootable media for partition and system troubleshooting.
- Wipe Disk – Securely erase data from a disk when you no longer need it.
Which Method Should You Use to Free Up Disk Space?
If your Windows PC is running out of storage, you don’t need to jump straight to paid software. Start with Windows’ built-in tools to remove unnecessary files and apps. If you need more advanced disk cleanup or partition management, EaseUS Partition Master provides tools to help you free up space and better manage your storage.
- Free Download: Get it for free and start freeing up disk space today.
- Unlock More Features: Get access to advanced disk cleanup and partition management features.
FAQ
Why is my C drive so full when I didn’t download large files?
Windows updates, temporary files, cached data, apps, and other system files can gradually fill up your C drive. Use Storage Sense or a disk space analyzer to identify what is taking up the most space.
What can I safely delete to free up space on the C drive?
You can usually delete temporary files, Recycle Bin contents, and other unnecessary files using Windows built-in cleanup tools. Avoid deleting files from system folders manually.
Does deleting files actually free up space?
Yes. Deleting unnecessary files frees up storage, but files in the Recycle Bin won’t free up space until you empty it.
Why is the “Extend Volume” option greyed out in Windows Disk Management?
Windows Disk Management can only extend a partition when suitable unallocated space is available next to it. If the space isn’t adjacent, Extend Volume may be unavailable.
Will I lose any data or operating system settings when extending C drive with EaseUS?
Extending the C drive can usually be completed without deleting existing files or reinstalling Windows, but partition operations always carry some risk. Back up important data before making changes.
What happens if the power goes out when I use EaseUS?
A power outage can interrupt a partition operation and potentially cause disk or data problems. Back up important files and avoid interrupting the process whenever possible.
