A full C: drive slows Windows down, blocks updates and eventually stops apps from launching. The good news is that most laptops can recover 20–60 GB without deleting a single document. Here is how to free up disk space on Windows in the order that gives the most room for the least risk.
Start with Storage Sense: it finds the room for you
Open Settings → System → Storage. Windows breaks usage down by category — Apps, Documents, Temporary files, and so on. Click through the largest category first rather than guessing. Then turn on Storage Sense (Settings → System → Storage → Storage Sense) so Windows automatically clears temporary files, empties the Recycle Bin after 30 days, and removes old Downloads it considers stale.
One caution: the “stale Downloads” rule can delete files you still want. Move anything important out of Downloads before you enable it.
1. Clear Windows Update leftovers
Old update packages can occupy 5–15 GB. Run Disk Cleanup as administrator: press Start, type “disk cleanup”, right-click → Run as administrator, then click “Clean up system files”. Tick “Windows Update Cleanup”, “Delivery Optimization Files” and “Previous Windows installation(s)” — the last one is typically 8–20 GB after a feature update, and it is undeletable after ten days, so claim it now if the upgrade went well.
2. Compact the WinSxS component store
The component store grows indefinitely. In an administrator Command Prompt or Terminal, run DISM /Online /Cleanup-Image /StartComponentCleanup /ResetBase. On a machine that has had many updates this can release several gigabytes. It takes 10–30 minutes. Do not interrupt it. Note that /ResetBase prevents uninstalling already-installed updates, which is a fair trade on a stable machine.
3. Move large folders to another drive
If your laptop has a second drive or you use an external SSD, relocate whole folders rather than individual files. Right-click the folder (for example Pictures) → Properties → Location → Move, and point it at D:\Pictures. Windows rewrites the library path, so apps keep finding your files. This is the single biggest win on a small 256 GB laptop.
4. Find the real space hogs with a treemap tool
Built-in tools tell you categories, not culprits. A free treemap viewer such as WizTree or WinDirStat shows exactly which folders are eating the drive, which is how you discover a 40 GB virtual machine image or a game you forgot was installed. Delete from that view rather than hunting folder by folder. Never delete anything under C:\Windows or C:\ProgramData by hand.
5. Hibernate file, page file and System Restore
If you never hibernate, disable it: powercfg /h off in an admin terminal reclaims a file roughly the size of your RAM — 16 GB on many laptops. Then cap System Restore: System Properties → System Protection → Configure → set Max Usage to 5%. Shadow copies of every Windows update can quietly consume 10% of a 512 GB drive. If you want restore points without the cost, keep them but shrink the allocation, and follow our guide to creating a restore point before big changes so you still have a safety net.
6. Uninstall apps, not just shortcuts
Settings → Apps → Installed apps, sort by size. Games and Creative Cloud-style suites dominate. Uninstalling also clears their caches. Check the “Apps & features” list for duplicate toolbars and trials — reinstalling is trivial if you need one back, and it is far better than deleting a document you will miss.
7. Move cloud-synced folders to on-demand
OneDrive, Dropbox and Google Drive all keep local copies by default. Enabling Files On-Demand (OneDrive) or “Online-only” for folders you rarely open can free tens of gigabytes instantly. Files still appear in Explorer; they download when opened. Do this before buying a bigger drive — it is free.
8. Empty the caches nobody mentions
- Browser profile folders: Chrome and Edge caches regularly pass 2 GB.
%TEMP%— safe to empty when no installers are running.- Old iPhone or Android backups in
AppData\Roaming\Apple Computeror the phone vendor folder. - Docker and WSL images, which can silently take 50 GB if you develop on the machine.
How much space do you actually need free?
Aim for 15–20% of the drive free. Below 10%, Windows updates fail, the page file cannot grow, and the SSD’s write performance drops. On a 256 GB laptop that means keeping at least 40 GB free. If you are still tight after all of the above, the honest answer is a larger SSD — but only after checking whether a heat or fan problem is also making the machine feel slow; see stopping laptop overheating and fan noise. More maintenance guides live on the tips-tricks.net homepage.