What lives in your Temp folder and why it grows
Every Windows account gets its own Temp folder, and both variables — %TEMP% and %TMP% — lead there, a compatibility relic dating back to DOS days. Programs use it for exactly the things they can afford to lose: setup files extracted by installers, partially downloaded data, intermediate video renders, crash dumps. Well-behaved apps clean up after themselves, but crashed setups, interrupted updates and portable tools leave everything behind, which is how the folder grows to several gigabytes over a couple of years.
You can confirm the location on your machine by pressing Win+R and typing %temp% — File Explorer opens the folder directly — or by running echo %TEMP% in a command prompt. The same junk exists one level up the tree: C:\Windows\Temp is the machine-wide counterpart, and cleaning it needs administrator rights.
- Extracted installer and update payloads left behind after setup
- Partial downloads that crashed before finishing
- Scratch files from video, archive and photo tools
- Crash dumps and error logs from misbehaving apps
- Extracted archives you opened straight from a ZIP
Cleaning the folder safely
Restart the computer first — a fresh boot closes almost every program that might still hold Temp files open. Then press Win+R, type %temp%, click OK, select everything with Ctrl+A and press Delete. Files currently in use produce the “folder or file in use” dialog; click Skip for those, or tick “Do this for all” and let the rest delete.
Disk Cleanup is the alternative that thinks for you: run cleanmgr for drive C:, and its Temporary files item skips anything modified in the last seven days, so it never fights with running apps. Settings → System → Storage → Temporary files offers the same checkbox. Command-line fans can use Remove-Item $env:TEMP\* -Recurse -Force -ErrorAction SilentlyContinue, which silently skips locked files.
Keeping Temp from filling up again
Nothing you delete stays deleted for long — every installer and many apps recreate their temp data on the next run, and that is by design. Storage Sense can sweep the folder automatically: turn it on under Settings → System → Storage and enable the cleanup of temporary files, optionally dropping the interval to every two weeks or even weekly on busy machines.
A maintenance cleaner like Kleaner PRO does the same on a schedule and covers the neighboring junk — Windows Update leftovers, browser caches, thumbnail databases — in one pass, which is convenient if you would rather never think about %TEMP% again. Just remember the per-account rule: each user's Temp is separate, so cleaning your own folder does nothing for the other accounts on the PC.
Questions and Answers
Is it safe to delete everything in %TEMP%?
In principle yes — files in active use are locked and will be skipped anyway. Rebooting first and then deleting everything else is the safest sequence.
What is the difference between %TEMP% and %TMP%?
Nothing in practice: on a default Windows setup both variables point to C:\Users\<name>\AppData\Local\Temp. The duplication is a compatibility leftover.
Why is my Temp folder full again right after cleaning?
Because apps constantly recreate temporary files — that is normal. Set up Storage Sense or a monthly cleanup instead of expecting the folder to stay empty.
Know what is included before you buy.
The one-time 30-minute trial covers core tools. PRO-labelled features stay locked until a paid license is activated.
Read next
Write to us: [email protected]