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Storage full? Free up space the smart way

Before deleting anything, find out what's actually using your space. Most 'full disk' situations come from a small number of large, forgettable culprits.

Written by Chhandita ShitReviewed by Buddheswar DandapatLast updated 2026-07-28

Before you start troubleshooting, run the actual test so you know what's broken.

Run the Storage Test

Quick checks first

  1. Empty the Recycle Bin (Windows) or Trash (macOS). Deleted files sit here using full space until you empty it, and it's easy to forget.
  2. Empty your Downloads folder. It quietly fills with installers, PDFs and duplicate files that outstay their usefulness.
  3. Check for old backup files. Phone backups, camera memory card copies, and old software installers often sit forgotten in a Downloads or Documents folder.
  4. Restart the computer before drawing conclusions. Temporary files sometimes clear automatically on restart and skew what you're seeing.

Run our Storage Test to see available quota and get a read on write speed, useful context if performance feels slow alongside the low space warning.

Find out what's actually using the space

Windows 11

  1. Go to Settings > System > Storage. Windows shows a breakdown by category: apps, documents, temporary files, and more.
  2. Click Temporary files to see and clear cache, previous Windows installations, and Recycle Bin contents in one place. A previous Windows installation folder (Windows.old) after an upgrade can take up 20GB or more.
  3. Click "Show more categories" and check "Other" or use a folder size tool if the breakdown doesn't add up, sometimes large files are buried in unexpected folders.
  4. Turn on Storage Sense (same Settings page) to automatically clear temporary files and Recycle Bin contents on a schedule going forward.

macOS

  1. Go to Apple menu > About This Mac > Storage, then click Manage.
  2. Review categories like Applications, Documents and "Other Volumes in macOS", and use the Recommendations panel, which can store files in iCloud and remove local copies, or automatically empty Trash after 30 days.
  3. Check for large old iOS backups under Documents > Legacy iOS backups if you've synced an iPhone via Finder or iTunes in the past.

Chromebook

  1. Open Settings > Device > Storage management to see a breakdown by category, including offline files, apps, and browsing data.
  2. Chromebooks generally rely on Google Drive and cloud storage, so removing offline copies of large files you don't need locally frees space quickly.

Android

  1. Go to Settings > Storage to see a breakdown by apps, photos, videos and cached data.
  2. Tap individual large apps and clear their cache separately from Settings > Apps > [app name] > Storage > Clear cache; this is safe and doesn't delete your data in the app.

iPhone

  1. Go to Settings > General > iPhone Storage for a breakdown and recommendations, including offloading unused apps while keeping their documents and data.
  2. Check the "Recommendations" section at the top, Apple often flags large attachments, duplicate photos, or big podcast downloads specifically.

The biggest space users, and safe ways to reduce them

  • Photos and videos. Back them up to a cloud service or external drive, then use the "optimize storage" option available on iPhone and Google Photos to keep smaller versions locally while originals live in the cloud.
  • Browser cache. Clearing browser cache and site data reclaims space quickly and is completely safe; it just means sites reload assets fresh next time.
  • Old app installers and downloaded games. Installer files (.exe, .dmg, .pkg) can be deleted once the software is installed, they're not needed afterward.
  • Duplicate files. Downloads folders often accumulate multiple copies of the same file (file, file (1), file (2)). A folder-size or duplicate-finder utility makes this easy to clean up.
  • Large unused applications. Video editors, games and design software can each take up tens of gigabytes; uninstall anything you haven't opened in six months.
  • Virtual machines and disk images. These are often several gigabytes each and easy to forget about entirely.

Moving files off the main drive

If you regularly work with large files (video projects, RAW photos, game libraries), consider moving them to an external drive or a secondary internal drive rather than constantly cleaning the main one. Many creative apps let you relocate their working folder or cache location in preferences.

When it's a hardware fault

  • If your drive reports far less capacity than it should (for example, a 512GB SSD showing only 250GB total, not just used), check Disk Management (Windows) or Disk Utility (Mac) for an unallocated partition rather than assuming the drive is faulty.
  • A drive that keeps filling up unexpectedly fast, faster than your actual usage explains, especially alongside slowdowns or crashes, can indicate a failing drive creating corrupted files or excessive system logs. Check drive health with your manufacturer's diagnostic tool.
  • If cleaning up storage doesn't restore expected free space and Windows or macOS reports a mismatch between "used" and what you can actually account for, run a disk check (chkdsk on Windows, First Aid in Disk Utility on Mac) to rule out file system errors.
  • Persistent "disk full" errors on a drive that should have plenty of room, combined with slow performance, are a common early warning sign of a dying SSD or hard drive. Back up important files as a precaution.

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