About fsize
fsize is a native Windows command-line utility for analyzing directory sizes and identifying the largest files and folders. It measures how much storage directory trees use and can rank the biggest consumers, helping users investigate where disk space is going. A depth-limited scan can display results as a readable tree, allowing users to see how large directories are structured. The tool can also produce JSON output, which makes its results usable in scripts and other automation. This supports both interactive storage checks and repeatable reporting workflows. The available information does not specify scan filters, permission handling, or performance limits. fsize's documented purpose is measuring directory sizes, ranking storage use, showing tree views, and exporting machine-readable results on Windows.
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