What is safe to delete on Windows, in one list
A verdict on every folder people ask about, from definitely safe to never, with the reason for each.
Most Windows cleanup advice tells you where space is. The harder question is which of it you can remove without consequence, and on Windows the answer is genuinely different per folder.
Definitely safe
| What | Why | More |
|---|---|---|
| The Recycle Bin, on every drive | You already decided | Per drive bins |
%TEMP% contents | Temporary by definition | Temp files |
Windows.old, through Settings | The previous install | Windows.old |
| Update caches, through Settings | Already installed | Update caches |
| Crash dumps and error reports | Records of past failures | Crash dumps |
| Browser caches | Rebuilt as you browse | Chrome on Windows |
| Build output and dependency folders | Rebuilt by a build | node_modules |
Safe with one check first
- The hibernation file, if you never hibernate and accept losing Fast Startup.
- Restore points, keeping the most recent.
- Old driver packages, via pnputil or Disk Cleanup.
- Superseded component store packages, via DISM only.
- Downloads, once you have looked at what is in there.
Not safe without understanding what it is
| What | Risk |
|---|---|
C:\Windows\Installer | Uninstalling and repairing stop working |
WinSxS, by hand | Windows cannot update or repair itself |
AppData\Roaming | Application settings and, often, your data |
ProgramData | Shared application data and licences |
.pst files | Mail archives that exist only on that PC |
A game's userdata or save folder | Local saves with no cloud copy |
Never
C:\Windows\System32and its neighbours.- The recovery partition.
pagefile.sysandswapfile.sys, which Windows manages.System Volume Information, which holds restore data.- Anything you cannot identify, in a folder you cannot identify.
The rule that covers everything not listed
If it can be downloaded again, rebuilt again or synced again, it is safe. If it exists only on this PC, it is not. Almost every mistake in this category comes from assuming a folder is the first kind when it is the second.
Common questions
What is always safe to delete on Windows?
The Recycle Bin, temporary files, Windows.old through Settings, update caches, crash dumps, browser caches and build output. All are either already discarded or regenerated.
What should I never delete on Windows?
System32 and the Windows folder's components, the recovery partition, the page file, System Volume Information, and anything you cannot identify. Most of it is protected anyway.
Is it safe to delete AppData?
Not as a whole. Roaming holds application settings and often your data. Specific cache folders inside AppData\Local are the safe version of the idea.
What is the general rule for safe deletion on Windows?
If it can be downloaded, rebuilt or synced again, it is safe. If it exists only on this PC, it is not, and that covers almost every folder people ask about.