Disk Space Analyzer for Windows Folder sizes, a treemap, the biggest files and an HTML or CSV report

A disk space analyzer is a Windows tool that scans a drive or folder and shows what is taking up the room. Univik Disk Usage Reporter reads the whole folder tree and lays the sizes out as a sorted list, a treemap, a biggest-files list and a file-type breakdown, so you see the space hogs at a glance.

Open Univik Disk Usage Reporter, pick the drive or folder and click Scan. The Folders view lists every folder by size with a share bar, the Treemap view draws each folder as a block sized to what it holds, and the Biggest Files view lists the largest single files with their location. Between them you can see exactly what is using your disk space.

It is free for 30 days. The trial runs every feature: any drive or folder, all four views and the HTML and CSV export, with no account and nothing uploaded. After 30 days a licence keeps it running. A Personal licence is $19 one-time, business licences are priced by staff count with one code per site, and every licence includes lifetime upgrades and a 30-day money-back guarantee.

Scan the drive, then open the Biggest Files view. It lists the largest single files across the whole drive, sorted by size, with each file's last-accessed date and full folder path. That is how you spot a forgotten 24 GB pagefile, an old ISO or a huge video without hunting through folders.

A treemap draws every folder and file as a rectangle sized to the space it uses, so a big block means a big folder. In Univik Disk Usage Reporter you click a block to zoom into it and use the path bar to step back out, which turns a 900 GB drive into a picture you can read in seconds.

Yes. From Export you can Save an HTML report that opens in any browser and prints to PDF, or export the current view to CSV for a spreadsheet. This is why the tool is called a Disk Usage Reporter, not only a viewer: the scan becomes a report you can keep or share.

The scan runs in parallel across multiple CPU threads. On a real test a 952 GB Windows drive holding 12.65 million files and 285,807 folders finished in 52.8 seconds on 12 threads. You can also stop a long scan early and read the partial result.

Yes, it is safe. The scanner reads file and folder sizes on your own PC and never uploads the list or any file content. No internet connection is needed to scan or to build a report, so a work or client drive stays private.

The tool finds what is using the space and shows you where it sits. You review the biggest folders and files, then remove what you choose in File Explorer. Keeping the scan read-only means a wrong click here cannot delete data by accident.

Univik Disk Usage Reporter supports Windows 11, 10, 8 and 7. It reads NTFS and other Windows file systems on internal and USB drives, and needs the .NET Framework, which is already on most Windows PCs.