Are .dmp Files Safe to Delete? (Memory Dumps)

Are .dmp Files Safe to Delete?

Short answer: yes, .dmp files are safe to delete. They are crash snapshots kept for debugging — remove them once you are done diagnosing, and reclaim the space (a full dump can be gigabytes).

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The verdict

Safe to delete once the crash is diagnosed. A .dmp (dump) file is a snapshot of what was in memory when a program or Windows itself crashed. Windows saves MEMORY.DMP and small minidumps after a Blue Screen; apps write their own .dmp when they hang. They exist only so a developer (or a tool like WinDbg / BlueScreenView) can work out what went wrong. They serve no purpose to the running system.

When to keep one

Keep a .dmp only if you still need to investigate a crash — for example you are chasing a recurring Blue Screen and plan to analyse the dump or send it to support. Otherwise it is dead weight; a full memory dump can be as large as your installed RAM.

How to delete them safely

Use Disk Cleanup. Run cleanmgr, tick System error memory dump files and System error minidump files, and clean. This is the cleanest way and needs no admin folder-digging.
Or delete manually. The system dump is at C:\Windows\MEMORY.DMP; minidumps live in C:\Windows\Minidump. Application dumps often sit in %LocalAppData%\CrashDumps.
Storage Sense can clear them automatically over time via Settings → System → Storage.

Is a .dmp a virus?

No — a dump is inert captured data, not executable code. It can, however, contain fragments of whatever was in memory (potentially passwords or personal data), so avoid uploading one publicly. Deleting it is always safe.

Read a .dmp before you delete it (optional)

If you want to know what caused the crash first, you do not need to be a developer:

BlueScreenView (free, NirSoft) opens C:\Windows\Minidump automatically and shows the driver or module that triggered the Blue Screen in plain text — the fastest way to spot a bad driver.
WhoCrashed gives a readable report with a likely cause and recommendation.
WinDbg (Microsoft) is the full tool: run !analyze -v for a detailed stack. Overkill for most people.

Once you have noted the culprit (or decided you don't care), delete the dump with Disk Cleanup as above — the fix is to update or roll back the flagged driver, not to keep the file.

FAQ

Are .dmp files safe to delete?

Yes. A .dmp is a crash memory snapshot kept only for debugging. Once you no longer need to diagnose the crash, deleting it is safe and frees space — a full dump can be several gigabytes.

How do I delete .dmp files in Windows?

Run Disk Cleanup (cleanmgr) and tick 'System error memory dump files' and 'System error minidump files'. Or delete C:\Windows\MEMORY.DMP and the C:\Windows\Minidump folder manually.

Is a .dmp file a virus?

No. It is inert captured memory data, not runnable code. It may contain sensitive fragments from memory, so do not share it publicly, but deleting it is always safe.

What creates .dmp files on Windows?

Windows writes memory dump (.dmp) files after a crash or BSOD — MEMORY.DMP in C:\Windows and small minidumps in C:\Windows\Minidump. Individual apps also dump their own memory when they fault.

Will deleting .dmp files break crash analysis?

Only if you still need to debug that specific crash. Once you've read it with a tool like WinDbg (or you simply don't care), deleting is safe — Windows writes a fresh dump the next time it crashes.

How large can a .dmp file get?

Minidumps are tiny (~64KB-1MB), but a full MEMORY.DMP can be as big as your installed RAM — several gigabytes. That size is the usual reason people clear them to free disk space.

Will deleting .dmp files break Windows or lose my crash history?

No. Dump files are diagnostic output, not system components — Windows regenerates them on the next crash. Deleting them only removes past crash snapshots you are no longer investigating, and can free several gigabytes if a full MEMORY.DMP is present.