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Local folder-size map

See a selected folder's size treemap, largest files and totals by extension without reading file contents.

Choose a folder explicitly. Only relative paths and file sizes are inspected; file contents are not read. Up to 10,000 files. Empty folders are absent, and this is not a whole-disk or physical-space scan.

Select a folder

0 selected file records. Browsers without folder selection can import a metadata manifest.

Import metadata manifest JSON

Manifest format

Use an array of relative path and byte-size records, or a previously exported folder report.

[{"path":"example/photo.jpg","size":2048}]

Metadata manifest

What it does

See a selected folder's size treemap, largest files and totals by extension without reading file contents.

How to use it

Select a folder or import a path/size manifest, then generate the report and optional JSON export.
Processing stays in your browser. No upload or sign-up.

Example

A folder with a 2 MiB photo and a 1 MiB text file gives the photo twice the treemap area.

Methodology

The browser exposes relative file paths and logical byte sizes after directory selection. Balanced rectangle subdivision preserves relative area; extension totals and descending file ranks derive only from metadata.

Limitations

1–10,000 files, 1,024-character relative paths, safe integer byte totals and 1 MB manifest import. Largest 60 non-empty files drawn separately; others grouped. Empty directories and browser-omitted files are absent. No deletion, content reading, disk-allocation measurement or whole-disk scan. Exported paths may be private.

Automation

This tool runs in your browser. No upload API or MCP endpoint is available.

View capabilities and documentation

Reference updated 2026-09-20

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