Yes — it is safe to delete the files inside the Windows %temp% folder, and doing so often frees 10 GB or more. The one rule: delete the contents, never the Temp folder itself, and skip any file that's currently locked.

TL;DR

  • The %temp% folder holds disposable working files from installers, running apps, and Windows services.
  • It's safe to delete everything inside it; Windows recreates what it needs on the fly.
  • Never delete the Temp directory itself — only its contents.
  • Skip locked files ("file is open in...") — those are in active use and will clear next time.

What does the Windows Temp folder do?

The %temp% folder (located at C:\Users\<you>\AppData\Local\Temp) is where Windows and your installed apps write scratch files they expect to throw away. Three sources fill it:

Source What it writes Why it lingers
Installers Setup archives unpacked before copying to Program Files Orphaned if setup crashes or is cancelled
Running apps Word autosaves, browser download buffers, game asset unpacks Left behind on unclean exit
Windows services Update logs, diagnostic dumps, print spool data Rarely auto-purged

When an app or installer exits uncleanly, its temp files are orphaned and stay forever. That orphaned buildup is where the bulk of the wasted gigabytes come from.

How to empty the Temp folder safely

Do not delete the Temp directory itself — Windows needs it to exist. Delete only the files inside it:

  1. Save your work and quit heavy apps (Office, browsers, games).
  2. Press Windows + R to open the Run dialog.
  3. Type %temp% and press Enter — File Explorer opens the Temp folder.
  4. Press Ctrl + A to select everything.
  5. Press Delete.
  6. When "The action can't be completed because the file is open in..." appears, tick Do this for all current items and click Skip.
  7. Right-click the Recycle Bin on the desktop and choose Empty Recycle Bin.

Skipping locked files is correct — those belong to apps that are still running. Everything that can be deleted will be, and nothing the OS actively needs gets touched.

Disk Cleanup vs deleting Temp manually

Windows has a built-in alternative if you'd rather not browse the folder by hand:

Method How to open Best for
Manual %temp% delete Run dialog → %temp% Quickly clearing your user temp files
Disk Cleanup Search Disk Cleanup, pick C: Temp + update leftovers + Recycle Bin in one pass
Storage Sense Settings › System › Storage Automatic, scheduled temp cleanup

For most people, Storage Sense (Settings › System › Storage › Storage Sense) is the lowest-effort option because it clears temp files on a schedule automatically. To go beyond temp files, see deep cleaning Windows 11 and 10 without third-party utilities and is it safe to compress the C drive to save space.

Is deleting temp files reversible — and what won't break?

Deleting temp files does not remove installed programs, documents, photos, or settings — those live elsewhere. The worst case is that an installer you cancelled mid-way may need to start over, or an app may rebuild a cache the next time you open it. Your actual data is never stored permanently in Temp, which is exactly why clearing it is one of the safest cleanups in Windows.

FAQ

Is it safe to delete everything in the Temp folder?

Yes, it's safe to delete all the files inside the %temp% folder. Windows treats them as disposable and recreates anything it still needs. Just don't delete the Temp folder itself, and skip any file that's locked because it's in use.

How much space can clearing Temp free up?

It varies, but a Temp folder that hasn't been cleared in months commonly holds 5–20 GB, mostly from orphaned installer archives and app caches. The first cleanup usually frees the most.

Why can't some Temp files be deleted?

Some files are locked because a running app or Windows service still has them open. Choosing Skip for those is correct — they'll clear automatically the next time you delete temp files after closing the app.

Will deleting temp files speed up my PC?

Clearing Temp frees disk space, which can help if your drive was nearly full, but it doesn't directly make a healthy PC faster. The main benefit is reclaimed storage and a tidier drive.

Keep your drive clear with less effort

Clearing %temp% is a great first move, but it's only one of many places Windows hides reclaimable space. For a broader approach to freeing storage and deciding what's safe to remove, explore Cleanor's storage cleanup solutions and read what to delete first when storage is full.

For your phone, Cleanor for iPhone finds large videos, duplicate photos, and heavy caches in one on-device pass — nothing uploaded.