How to Free Up Disk Space on Windows 11

When Windows 11 warns that your drive is almost full, you don’t need to buy anything or install a “cleaner” app — Windows has built-in tools that can reclaim 10–30 GB in a few minutes. Here’s how to free up space safely, from the biggest, easiest wins to the deeper cleanups, and how to stop the drive filling up again.

Last checked: September 2026.

First, see what’s using the space

Open Settings → System → Storage. Windows breaks down your drive by category — apps, temporary files, documents, pictures, and so on — so you can aim at the biggest offenders instead of guessing. A nearly-full C: drive is worth acting on: Windows needs free space to install updates and run smoothly, and a full system drive causes slowdowns and failed updates.

1. Temporary files and cleanup recommendations

1. In Storage, click Temporary files.
2. Review the boxes — Windows Update leftovers, Recycle Bin, thumbnails, and delivery-optimization files are all safe to remove.
3. Click Remove files.
4. Then open Cleanup recommendations for large or unused files, apps you rarely open, and files already backed up to the cloud.

This alone usually frees the most space, and everything it offers is safe to delete.

2. Turn on Storage Sense for automatic cleanup

In Settings → System → Storage → Storage Sense, switch it on. It runs on a schedule you choose (daily, weekly, monthly, or when the disk is low), emptying the Recycle Bin and clearing temporary files automatically. Set it once and low-disk warnings largely stop coming back — it’s the single best “set and forget” step here.

3. Disk Cleanup for a deeper sweep

The classic tool still exists and reaches things the Storage page doesn’t:

1. Search Disk Cleanup (or run cleanmgr) and pick your C: drive.
2. Click Clean up system files to unlock the big items.
3. The two that free the most: Windows Update Cleanup (old update files) and Previous Windows installation(s) — the Windows.old folder left after a version upgrade, which can be 10–20 GB on its own.
4. Tick what you want and confirm.

4. Uninstall what you don’t use

Open Settings → Apps → Installed apps, sort by size, and remove programs you no longer need — big games and creative suites are usually the largest. For apps that won’t uninstall cleanly, see our guide to uninstalling stubborn programs.

5. Move large personal files off the system drive

Videos, photo libraries, and disk images are often the real space hogs. In Storage, look at the large-files breakdown and move anything you don’t need day-to-day to an external drive or cloud storage. You can also point OneDrive to keep files “online only” so they don’t take local space until you open them.

Troubleshooting

1. Drive fills up again fast. A runaway app log or the Windows Update cache is usually behind it; Storage Sense plus a one-time Windows Update Cleanup fixes most cases.
2. Can’t delete Windows.old. Don’t delete it manually — use Disk Cleanup → Clean up system files → Previous Windows installation(s). Windows also removes it automatically about 10 days after an upgrade.
3. Still low after cleaning. Check Storage for a huge “System & reserved” or hidden hibernation file (hiberfil.sys); disabling hibernation reclaims several gigabytes if you don’t use it.
4. Recycle Bin won’t empty space. Empty it manually, then run Storage Sense — occasionally a locked file holds space until reboot.

Skip the “PC cleaner” apps

Paid registry- and junk-cleaners promise miracles but mostly duplicate what Windows already does for free — and some bundle adware, the kind of thing our spyware removal guide deals with. Windows’ own tools plus the occasional uninstall are enough; for genuinely useful extras, see the best utility software.

FAQ

How much space can I expect to free? Commonly 10–30 GB in minutes, more if you have a Windows.old folder from a recent upgrade.

Is it safe to delete temporary files? Yes — the items Windows lists under Temporary files and Disk Cleanup are safe to remove.

Do I need a paid cleaner? No. Windows’ built-in tools cover it; paid cleaners add little and sometimes add risk.

What if my drive is still full? Move large media off the system drive, or consider a larger SSD — but clean first; most “full” drives have gigabytes of reclaimable junk.

Featured image: Photo: PantheraLeo1359531 / Wikimedia Commons, CC BY 4.0