See what's filling your disk — without installing anything

Pick a folder and see exactly where the space goes — largest files and folders first, with a treemap. Everything is measured locally in your browser; file contents are never opened and nothing is uploaded.

Folder to analyze

Click to pick a folder to analyze.
The scan runs locally — nothing is uploaded, no file contents are read.

Largest items

Filters & display

Folders Files Min size Rows

Path	Size	Share	Kind

Quick start

Click the box above and pick a folder — Downloads, a project directory, or a mounted external drive.
The scan walks every subfolder and adds up file sizes. Big trees take a few seconds; progress shows the file count.
Use the filters to hide small files, list folders only, or focus on the biggest offenders.
Download the CSV report to sort and chart the full numbers in any spreadsheet.

How it works

Nothing uploaded. The scan reads file names, sizes and dates only — file contents are never opened.
Works offline. Once the page has loaded you can disconnect from the internet; scanning needs no network.
Best in Chrome or Edge. They support the deep folder picker. Other browsers fall back to a standard folder selector with the same results.
Honest limits. A browser can only see what you grant it — system-protected folders are out of reach, and OS-level tricks like sparse files or compression may not be reflected in reported sizes. To measure a whole drive, pick its top-level folder.

This page makes zero network requests after it loads. The scan reads file names, sizes and modification dates through your browser's local file APIs — file contents are never opened, and nothing is sent anywhere.

What is this page?

This is the real Disk Space Analyzer — the same tool Untracked sells as a download — running free, right here in your browser. Your files are processed entirely on your own device: nothing is uploaded, no account is needed, and the page makes no network requests after it loads. You can verify that yourself: load the page, open your browser's network inspector, or even disconnect from the internet and keep using it.

Free page vs. the €7 download

Here (free): unlimited single files — one at a time, as many as you like, forever. Counted only in your own browser (localStorage): no cookies, no analytics, nothing that identifies you.

The download (€7, once): batch/folder processing, ZIP export, and the tool as a single HTML file that runs offline forever on any computer you own — even with no internet at all. Plus the commercial-use licence. Full details →

Questions people ask

Does scanning upload anything?

No. The scan reads file names, sizes and dates through your browser's local file APIs — file contents are never opened and nothing is sent anywhere. Disconnect from the internet after the page loads; scanning still works.

How do I scan a whole drive?

Pick the drive's top-level folder. The browser can only see folders you explicitly grant, so system-protected areas stay out of reach — that's the privacy trade working in your favor, and it means there's nothing to install.

How do I read the treemap?

Each box is one item at the top level of the folder you picked; bigger box = more space, and folder boxes include everything inside them. The table below lists the largest items in plain numbers, filterable by size and kind.

What's the difference between this free page and the paid download?

This page runs unlimited scans, one folder at a time, and lives on this website. The €7 download is the same analyzer as a single file — no limits, offline forever, on any computer.