What temporary files are and why you should remove them
Temporary files are data your operating system and programs create while they run, then forget to clean up. They sit on your hard drive taking up space — sometimes gigabytes of it — and slow down your computer because your system has to search through them. Deleting them regularly frees up storage and can make your machine run faster.
Windows stores temp files in folders like C:\Users\[YourUsername]\AppData\Local\Temp. Mac puts them in /var/tmp and /tmp. Linux uses /tmp. Most of the time these files are safe to delete — they are meant to be temporary. The risk is low because your system recreates them if a program needs them again.
You can delete them manually by navigating to these folders, or use built-in tools that do it automatically. The method you choose depends on how comfortable you are with file navigation and whether you want a one-time cleanup or ongoing maintenance.
Key Takeaways
- Temporary files accumulate in system folders and can consume several gigabytes of storage space over time.
- Windows users can use Disk Cleanup or Storage Sense to remove temp files without navigating folders manually.
- Mac users can delete files in /var/tmp and /tmp using Finder or Terminal, or use third-party cleanup tools.
- Linux users typically delete temp files from /tmp using the command line, which is the fastest method.
- It is safe to delete temporary files because your system will recreate them if programs need them again.
Deleting temporary files on Windows 10 and 11
The easiest method on Windows is Storage Sense, which automates the process. Open Settings, go to System, then Storage. Turn on "Storage Sense" and set it to delete temporary files automatically — you can choose daily, weekly, or monthly. Windows will then remove temp files on the schedule you pick without you having to do anything.
If you want to delete temp files right now instead of waiting for a schedule, use Disk Cleanup. Press the Windows key, type "Disk Cleanup", and open it. Select your C: drive (or whichever drive holds Windows), then check the box next to "Temporary files". Click Delete Files and confirm. This removes files from C:\Users\[YourUsername]\AppData\Local\Temp and other temp locations.
For manual deletion, open File Explorer and paste this into the address bar: %temp%. This takes you directly to your temp folder. Select all files (Ctrl+A), then delete them. Some files may be locked by running programs — Windows will skip those, which is fine. Restart your computer if you want to delete locked files, since programs will not be running then.
Deleting temporary files on Mac
Mac does not have a built-in automatic cleanup tool like Windows Storage Sense, but you can delete temp files manually using Finder. Open Finder, press Cmd+Shift+G to open "Go to Folder", then type /var/tmp and press Enter. Select all files (Cmd+A) and drag them to Trash, then empty Trash. Repeat the process for /tmp.
Some files in these folders may be in use by running programs, so you may not be able to delete everything. That is normal — just delete what you can. If you want to delete everything including locked files, restart your Mac first so no programs are running.
Alternatively, use Terminal for faster deletion. Open Terminal (Applications > Utilities > Terminal), then type: rm -rf /var/tmp/* and press Enter. Do the same for /tmp by typing: rm -rf /tmp/*. Terminal requires you to enter your password. This method deletes everything in those folders at once, so use it only if you are confident nothing important is there.
Deleting temporary files on Linux
Linux temp files live in /tmp, and the fastest way to delete them is through Terminal. Open Terminal and type: sudo rm -rf /tmp/* then press Enter. You will be asked for your password. This removes all temporary files at once.
If you want to be more selective, type: ls /tmp to see what is in the folder first. Then delete specific files by typing: rm /tmp/[filename]. This takes longer but lets you avoid deleting anything you might need.
Some Linux systems also use /var/tmp for temporary files. You can clean that folder the same way: sudo rm -rf /var/tmp/*. Most distributions do not require this, but it does not hurt to check both locations if you are trying to free up maximum space.
How much space temporary files actually use
The amount of space temp files consume varies widely. On a computer that has not been cleaned in months, they can easily reach 5 to 10 gigabytes. On a machine cleaned regularly, they might only be a few hundred megabytes. The longer you go without cleaning, the more they pile up.
To see how much space your temp folder is using before you delete anything, right-click the folder in File Explorer (Windows) or Finder (Mac), select Properties or Get Info, and look at the size. This tells you how much space you will free up. On Linux, type: du -sh /tmp in Terminal to see the size.
When temporary files can cause problems
Temporary files rarely cause serious problems, but they can slow down your computer if there are millions of them. Your system has to search through them when looking for other files, which adds delay. They also consume disk space that could be used for programs or documents.
Occasionally, a corrupted temp file can cause a program to crash or behave oddly. If a program keeps crashing and you have not cleaned temp files recently, deleting them sometimes fixes the issue. The program will recreate the temp files it needs the next time it runs.
Temp files do not usually contain anything important — they are not your documents, photos, or settings. The only exception is if a program stores something critical in a temp folder by mistake, which is rare. Deleting them is safe.
Setting up automatic cleanup so you do not have to remember
On Windows, Storage Sense handles this automatically once you turn it on. Go to Settings > System > Storage, enable Storage Sense, and choose how often you want cleanup to run. You can also set it to delete files in your Downloads folder and Recycle Bin automatically, which frees up even more space.
Mac does not have a built-in automatic cleanup, but you can use a third-party tool like CleanMyMac X or Disk Diag to schedule regular deletion. These tools are not free, but they automate the process so you never have to think about it. Alternatively, you can set a calendar reminder to manually clean temp files every month or two.
Linux users can create a cron job to delete temp files on a schedule. Open Terminal and type: crontab -e, then add a line like: 0 2 * * * rm -rf /tmp/* to run cleanup at 2 AM every day. This requires basic command-line knowledge, but it is the most automated approach on Linux.
Frequently Asked Questions
Will deleting temporary files break my programs?
No. Temporary files are meant to be deleted. If a program needs a temp file and cannot find it, the program will recreate it. The only risk is if you delete temp files while a program is actively using them, but most operating systems prevent that by locking files in use.
Can I delete temporary files while my computer is running?
Yes, on all three operating systems. Some files may be locked because programs are using them, and your system will skip those. If you want to delete everything including locked files, restart your computer first so no programs are running, then delete the temp folders.
Where do I find temporary files on my external hard drive?
External drives do not typically accumulate system temporary files the way your main drive does. If you want to clean an external drive, connect it and navigate to the same temp folders (C:\Users\[YourUsername]\AppData\Local\Temp on Windows, or /var/tmp and /tmp on Mac and Linux) on that drive. Most external drives will not have these folders unless programs have been installed on them.
Is it safe to use third-party cleanup tools?
Built-in tools like Windows Storage Sense and Disk Cleanup are safest because they are made by the operating system creators. Third-party tools like CCleaner or CleanMyMac X work, but they have access to more of your system. Research any tool before installing it and read reviews from other users first.
How often should I delete temporary files?
If you set up automatic cleanup, you do not need to think about it. If you delete manually, once a month is reasonable for most users. If your computer is running slowly or you are running low on storage space, delete them more often — even weekly if needed.