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The tool reads file names and sizes only. No file contents are ever read or uploaded.
FAQ — Disk Space Analyzer
Disk Space Analyzer — frequently asked questions
What is a disk space analyzer?
A disk space analyzer scans your folders and files and shows you how much storage each one uses. It helps you quickly identify what is taking up space on your hard drive or SSD so you can decide what to delete, move, or archive.
Does this disk space analyzer upload my files?
No. This tool runs 100% in your browser using the File System Access API. Your files are never uploaded to any server. Only file names and sizes are read — file contents are never accessed. You can verify this in your browser's network tab — zero outbound requests with your data.
Which browsers support this tool?
The File System Access API is supported in Google Chrome 86+ and Microsoft Edge 86+. It is not currently supported in Firefox or Safari. If you are on an unsupported browser, a notice will appear at the top of the page.
Can I scan my entire hard drive?
Yes. When the folder picker opens, navigate to your drive root (C:\ on Windows or / on macOS/Linux) and select it. The scan will recursively walk all subfolders. Note that some system-protected folders may be skipped if the OS denies access — this is normal and expected behavior.
How is this different from WinDirStat or TreeSize Free?
WinDirStat and TreeSize are Windows desktop applications that require installation. This tool works directly in your browser — no installation needed. It is ideal for quick scans, shared or managed machines where you cannot install software, or when you want a zero-setup alternative.
Why does the scan take a while?
Scanning reads metadata (name and size) for every file in every subfolder recursively. A folder with thousands of files or deeply nested subfolders will take longer. The tool shows a live progress counter so you can see it working in real time.
Can I scan network drives or external drives?
Yes, as long as the drive is mounted and visible to your operating system. Simply navigate to it in the folder picker. Scanning speed depends on the network or USB connection speed.
What does the percentage bar show?
Each bar shows how much of the parent folder's total size this item represents. A bar at 80% means this subfolder or file accounts for 80% of its parent's total disk usage. This makes it easy to spot the biggest space consumers at a glance.
Free Web-Based Disk Space Analyzer — Find What's Eating Your Drive
This free disk space analyzer runs entirely in your browser. Using the modern File System Access API, it can scan any folder on your computer — including your entire hard drive — and show you a detailed tree of folder sizes, file counts, and relative usage percentages. No installation required, no data uploaded, no account needed.
How it works
Click Choose Folder, grant browser permission for the folder you want to analyze, and the tool recursively walks every subfolder and file. It reads only names and sizes — never file contents. Results appear as an interactive tree with size bars so you can immediately see which subfolders are the largest. You can sort by size, name, or file count, and adjust how deeply the tree is expanded by default.
Alternatives and comparison
Popular disk space analyzers include WinDirStat (Windows), TreeSize Free (Windows), DaisyDisk (macOS), and Baobab (Linux). All of these require installation and are platform-specific. This web-based alternative works on any OS with a Chromium browser — Windows, macOS, Linux, or ChromeOS — with zero installation and zero data leaving your machine.
Use cases
Quickly find large log folders, bloated node_modules or .git repositories, forgotten downloads, duplicate backups, or media caches consuming gigabytes of space. Ideal for developers, IT admins, and anyone doing routine disk cleanup. Export to CSV for a full file inventory or to share with your team.