Test FolderHeat without your files

Open the main page and press Load 4,800-file demo. You should see a non-zero total size, 4,800 files, hundreds of folders, a treemap, folder rows, extension bars and a largest-file table.

Quick functional test

Create a temporary folder with three subfolders. Put a large video in one, a few images in another, and text files in the third. Select that temporary folder. The video branch should dominate the treemap and the video should appear near the top of Largest files.

Browser support

The folder picker uses the widely supported directory-selection attribute available in Chromium-family browsers and many current desktop browsers. If your browser does not expose folder selection, dropping or selecting multiple files can still produce a report, but nested relative paths may be limited.