QDirStat helps you find large files by combining numerical directory totals with a visual treemap. The tree shows the exact hierarchy, while the treemap makes unusually large items easy to notice.
The safest workflow is investigative: select a large block, locate it in the directory tree, identify the owning application and decide whether the item should be deleted, moved, compressed or left alone.
Choose the correct scan root
Start narrow
Scan a home folder, project directory or mounted data volume rather than the entire system when the problem is already localized.
Avoid unrelated mounts
A broad root scan can include slow network shares, pseudo filesystems or removable media that make results harder to interpret.
Sort the directory tree
Sort by total size
Large parent folders rise to the top, making it easier to drill down one level at a time.
Compare item counts
A directory with millions of tiny files can be operationally important even when no single file dominates the treemap.
Use the treemap as a locator
Select a large rectangle
The selected block should correspond to a file or directory shown in the tree.
Check color patterns
Clusters with the same color can reveal file types such as logs, archives, media or build artifacts that use space across several folders.
Verify before cleanup
Identify ownership
Determine which application or workflow created the item.
Choose the right action
Application caches may have built-in cleanup commands; archives may be moved; active databases should not be deleted manually.
Confirm backups
Protect unique data before removing a large item merely to recover space quickly.
Next steps
Return to the main QDirStat page for the source archive, compatibility summary and twenty-question FAQ, or continue with a related guide below.