What this file tool does
Walk a folder hierarchy with explicit local permission and report directories that contain no files or subfolders.
With File System Access support, the tool recursively enumerates directory handles. Strict mode finds directories with zero entries; no-files mode finds directory subtrees containing no files.
Processing stays on this device. True empty folders cannot be detected from a standard webkitdirectory upload because browsers omit directories with no files. Use the directory-access button in a supported browser.