How to Free Up 20 GB on Windows 11 Without Any Software

When your main drive starts running low on space, you do not need third-party cleaner utilities or sketchy registry cleaners. Windows 11 includes powerful, built-in storage management tools that can safely eliminate 20 GB or more of system junk in just a few minutes.

Step 1: Use Windows 11 Cleanup Recommendations

Microsoft added a dedicated cleanup scanner directly into the Windows 11 Settings app. It consolidates duplicate files, unused installers, and huge temporary caches into one place so you can clear them with a single click.

1. Press Windows Key + I to open the Settings app.
2. Click on System in the left sidebar, then select Storage on the right.
3. Under the Storage management section, click on Cleanup recommendations.
4. Review the four categories: Temporary files, Large or unused files, Files synced to the cloud, and Unused apps.
5. Expand each section, select the items you no longer need, and click Clean up.

Step 2: Remove Old Windows Installation Files

If you recently upgraded Windows 11 to a newer version or feature update, Windows keeps a full copy of your prior installation in a folder called Windows.old. This folder alone often consumes between 15 GB and 30 GB of storage space.

1. Open Settings (Windows Key + I) and navigate to System > Storage.
2. Click on Temporary files. Windows will take a moment to scan your drive.
3. Look for Previous Windows installation(s) and check the box next to it.
4. Also check Windows Update Cleanup and Delivery Optimization Files.
5. Scroll up to the top of the list and click the blue Remove files button.

Why This Works

Windows intentionally hoards old setup files for 10 days in case a feature update fails or causes hardware crashes. Once your PC is running reliably on the new build, these multi-gigabyte rollback files become useless dead weight on your solid-state drive.

A Crucial Warning

In the Temporary Files menu, look carefully before clicking “Remove files.” Windows 11 often lists your personal Downloads folder here. Unless you intend to wipe your recent downloads, ensure the Downloads box remains unchecked before proceeding.

Step 3: Clear the Hidden Hibernation File (Desktops Only)

Windows reserves a file on your primary drive named hiberfil.sys to store your open session when hibernating. If you use a desktop PC connected to constant power and never use the hibernate state, this file wastes anywhere from 8 GB to 32 GB depending on your total installed RAM.

1. Press Windows Key + S, type cmd, right-click Command Prompt, and select Run as administrator.
2. Click Yes when prompted by User Account Control.
3. Type the following command and press Enter:
   powercfg -h off
4. The prompt will execute silently, and the allocated file will instantly vanish from your C: drive.

Note: If you are on a laptop, keep hibernation active so your battery does not fully drain during prolonged sleep periods.

Step 4: Enable Storage Sense to Prevent Bloat

Instead of manually scrubbing your drive every few months, turn on Windows 11’s automated housekeeper to clear cache files and empty the Recycle Bin on a schedule.

1. Return to Settings > System > Storage.
2. Toggle the switch next to Storage Sense to On.
3. Click the arrow next to Storage Sense to open its configuration page.
4. Check the box labeled Keep Windows running smoothly by automatically cleaning up temporary system and app files.
5. Under Run Storage Sense, choose Every week or During low free disk space.
6. Set Delete files in my recycle bin if they have been there for over to 30 days.

Key Steps at a Glance

• Settings > System > Storage > Cleanup recommendations catches hidden cache pools quickly.
• Previous Windows installation(s) inside Temporary files frees the largest chunk of disk space (up to 30 GB).
• Running powercfg -h off in an elevated Command Prompt reclaims gigabytes of RAM cache on stationary desktop PCs.
• Always uncheck the Downloads checkbox when clearing temporary system files.
• Turning on Storage Sense keeps cache from building back up automatically.

Reclaiming primary drive space does not require risky registry hacks or paid cleanup suites that bog down your startup routine. Taking five minutes to sweep away expired update snapshots and automating Storage Sense guarantees your Windows 11 installation stays fast, lean, and free of persistent low-disk-space warnings.