How to Clean Disk Space on Windows, Mac, and Phones

Cleaning disk space frees room for downloads, updates, and new files, and can help when a device warns that storage is nearly full. The safest approach is to find what is taking up space before removing anything. Menu names vary slightly by operating system and version, but the same principles apply to computers, tablets, and phones.

What You’ll Need

Your device and access to its storage settings or built-in cleanup tool.
An external drive or trusted cloud storage if you plan to back up files.
A few minutes to review large files, downloads, apps, and deleted items.

Step-by-Step

Check available storage. Open your device’s storage settings to see how much space is free and which categories use the most. On Windows, look under Settings and System for Storage; on a Mac, open System Settings and General, then Storage. On iPhone or iPad, check Settings, General, and iPhone or iPad Storage. On Android, look for Storage in Settings. Paths and labels can differ slightly by version. This overview helps you focus on the biggest space users.
Back up anything important. Before deleting personal documents, photos, videos, or project files, make sure you have another copy you can access. Confirm that a cloud upload has completed or that files open from the backup drive. A file visible in a cloud app may not always be fully uploaded. Do not treat a synced folder as an independent backup: deleting a synced item can remove it from other devices too.
Review downloads and large files. Open your Downloads folder and sort by size or date. Delete installers, duplicate files, and documents you recognize and no longer need. Check large videos, screen recordings, and archives as well. Open unfamiliar files before removing them; names alone may not reveal their purpose. Avoid deleting items from system folders or folders belonging to apps.
Remove apps you no longer use. Use the operating system’s app or program settings to uninstall software you recognize and no longer need. Removing an app this way is safer than dragging random folders to the trash because uninstallers can remove associated components. Check whether an app stores local projects, saved games, or other files before uninstalling it. You can reinstall an app later, but its data may not come back automatically.
Use the built-in cleanup option. On Windows, review Storage settings and options such as Temporary files or Storage Sense; check each category before confirming. On a Mac, use the recommendations shown in Storage settings and remove files through Finder. On phones, follow the storage screen’s suggestions, such as reviewing large attachments or unused apps. These features may vary by version. Read what each option will delete, particularly if it mentions downloads, caches, or offline files.
Clear temporary or cached data selectively. Temporary files and app caches can sometimes be removed using the device’s built-in tools. A cache usually contains data an app can recreate, but clearing it may sign you out, reset preferences, or make content load again. Do not install an unfamiliar “cleaner” app or use a command you do not understand. Avoid manually removing system files, logs, or hidden folders to chase a small amount of space.
Review photos, videos, and messages. Large media files and message attachments can take substantial room. Delete unwanted items only after checking your backup and any sync settings. On many devices, deleted photos and files remain in a Recently Deleted, Trash, or Recycle Bin folder for a while and continue to use storage until removed there. If you want to keep an item, move or copy it somewhere safe before clearing that folder.
Empty deleted items and restart. When you are sure you will not need the deleted files, empty the Recycle Bin, Trash, or Recently Deleted folder using its own controls. This action can be permanent, so do one last review first. Restart the device if the storage total does not update immediately, then reopen storage settings and check the available space.

Common Mistakes

Deleting files before checking a backup: Sync is not always backup, and a deletion can propagate to other devices. Confirm that a separate copy is complete and usable.

Removing unfamiliar system files: Deleting files from operating-system or application folders can break features or prevent apps from opening. Use built-in cleanup and uninstall tools instead.

Assuming deleted means gone: Items in the trash or recently deleted folder may still occupy space. Empty them only after checking their contents.

Using a random cleanup utility: Third-party tools may request broad access or remove data you want. Prefer settings supplied with your operating system unless you have a clear reason to trust another tool.

Expecting every category to shrink: Some storage is reserved for the operating system, updates, or app data. Do not try to force-delete protected files to reclaim it.

Tips

Sort files by size to find a few large items rather than deleting many small ones.
Set a reminder to review downloads and old recordings occasionally, instead of waiting for a low-storage warning.
Move files you want to keep to an external drive or cloud service, then verify the copy before deleting the original.
If your device supports storage optimization, check whether it keeps full-resolution originals or removes local copies. Understand how to retrieve files before enabling it.
Leave some free space for normal operation and updates. If a device remains nearly full after cleanup, investigate apps and media rather than removing operating-system components.

Troubleshooting

Storage does not increase: Empty the trash or recycle bin, check whether the cleanup tool finished, and restart the device. Some screens update after a delay. Review large apps and media again if the total still looks unchanged.

The storage report says “Other” or “System Data”: These labels can include caches, temporary data, and files managed by the operating system. Use its recommended cleanup steps, update only when you have enough room, and avoid deleting hidden system folders manually. Contact the device maker’s support if the category is unusually large or keeps growing.

You cannot delete a file: Close the app that may be using it, check that you have permission, and try the operating system’s normal file manager. Do not force-delete a file if you are unsure what it does.

Files disappeared from other devices: Check the cloud service’s trash or recovery area and pause further cleanup. Sync may have carried the deletion across devices. Restore from a backup or use the service’s recovery instructions.

There is still not enough room for an update: Remove or move more personal files and apps, then recheck free space. If the device offers a supported way to update using a computer or external storage, follow its official instructions; do not delete protected files to make room.

Frequently Asked Questions

Is it safe to delete temporary files?

It is generally safest to remove temporary files through your device’s built-in cleanup tool. Review the categories first, since some options can also remove downloads or offline content you may want.

Does emptying the trash permanently delete files?

Usually, emptying the trash or recycle bin removes those items from the device and may make recovery difficult. Check the folder and your backup before confirming.

Will deleting photos from my phone delete them from the cloud?

It depends on the sync service and settings. Read its deletion and backup guidance, and verify an independent copy before removing photos you want to keep.

Can I delete files in the System or Library folders?

Do not remove files from system folders just because they are large or unfamiliar. Use the operating system’s storage recommendations or ask the device maker’s support for help.

Why does my disk fill up again?

New downloads, app data, message attachments, updates, and cached content can use space over time. Check the storage breakdown periodically to spot which category is growing.

Further reading: Microsoft Support and Apple Support. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.