FSFreeSize · disk space analysis for Windows

Where did the space go?
FSFreeSize shows you – while it is still counting.

FSFreeSize scans your drives and shows right away which folders and files take up the most space. The numbers grow live, and the folder you expand is calculated first.

Download for free See the features

Free · Windows 10 and 11 (64-bit) · as a setup or as a single file

FSFreeSize: drives on the left, the folder tree with size, counts and share of the drive on the right
Folders by size, live while scanning

Live resultsSizes grow while the scan runs.

Your folder firstWhatever you expand is calculated first.

One fileAlso runs without installation, e.g. on a server.

Features

Track down what eats your disk

All drives at a glance

Fixed and USB drives with their usage at a glance; one click starts the analysis.

Folder tree with numbers

Size, number of folders and files, last change and share of the drive – sortable by every column.

Ring chart

The largest folders as a ring with a legend; the colors stay the same for the whole session.

File list

The files of the selected folder with size, share, modification date, attributes and path.

Minimum size

A slider hides folders and files below a size, so only what matters remains.

Pause

Pause and resume the scan, for instance when the disk is needed for something else.

Clean up like in Explorer

Del moves to the recycle bin, Shift+Del deletes permanently, multi-select with Ctrl and Shift – the numbers adjust immediately.

Carry on right away

Open in Explorer, start a command prompt or PowerShell in the folder, show its properties.

Requirements

What you need

  • Windows 10 (version 1809 or later) or Windows 11, 64-bit
  • Administrator rights: FSFreeSize starts elevated so it can read protected folders, too; folders it cannot access are marked
  • The program itself is in English, the setup in English or German

Download

Download FSFreeSize

Free of charge. The setup installs FSFreeSize with a Start menu entry. The single file runs without installation – handy on servers; to update, simply replace it.

Setup for Windows · version 1.2610.18.2 Single file, no installation

Questions or wishes? Get in touch.