Disk Space Analyzer -- Find Biggest Files & Folders

Scan a Folder

Pick any folder on your computer -- even an entire drive like C:\. The tool scans every file, skips OS system directories, and shows you the biggest space hogs.

How It Works

This tool uses the File System Access API built into modern browsers (Chrome, Edge, Opera) to read your folder structure directly on your machine. Here is what happens when you click "Choose Folder to Scan":

1. You pick a folder -- the browser shows a native folder picker dialog. You can select any folder, including a drive root like C:\.
2. Recursive scan -- the tool walks every subfolder and reads each file's size (not its contents). Common system directories are automatically skipped.
3. Filter and sort -- files under 50 MB (adjustable) are dropped from the file list. Everything is sorted largest-first.
4. Display results -- you see three views: biggest individual files, biggest folders by total content, and a breakdown by file type.

No file contents are read. Only file names and sizes are collected. Everything stays in your browser -- nothing is uploaded or transmitted.

Which System Folders Are Skipped?

When scanning a drive root, these directories are automatically excluded because they contain OS files you typically cannot or should not delete:

You will still see Program Files, Users, and other top-level directories -- the skip list only targets things you cannot clean up yourself.

Tips for Freeing Up Disk Space

• Old downloads -- check your Downloads folder for installers, ISOs, and ZIP files you no longer need.
• Duplicate media -- large video files, photos, and music collections often have duplicates or backups you forgot about.
• Game caches -- Steam, Epic, and other game launchers can leave behind tens of GB of unused game files.
• Virtual machines -- VM disk images (.vmdk, .vdi, .vhd) are often the single largest files on a drive.
• Temp and cache folders -- browser caches, Windows temp folders, and build caches can grow surprisingly large.
• node_modules -- old JavaScript projects can have hundreds of MB in dependency folders. Delete them for projects you are not actively working on.

Frequently Asked Questions

How does this disk space analyzer work?

You pick a folder using your browser's native file picker. The tool recursively walks every subfolder, reads each file's size metadata (not its contents), filters out small files and system directories, and displays the results sorted by size.

Does this tool upload my files?

No. Everything runs locally in your browser using the File System Access API. No file names, sizes, or contents are transmitted anywhere. Your data never leaves your machine.

Why are some files or folders missing?

Files smaller than 50 MB are excluded by default (you can change this threshold). System directories like Windows, $Recycle.Bin, and System Volume Information are skipped because they contain OS files you typically cannot delete.

Which browsers support this?

The File System Access API is supported in Chrome, Edge, and Opera (version 86 and later). Firefox and Safari do not currently support this API. If your browser is not supported, you will see a notice at the top of the tool.

Can I scan my entire C:\ drive?

Yes. Select C:\ (or any root folder) in the folder picker. The scan may take a few minutes for very large drives. System folders are skipped automatically so the results focus on files you can actually manage.

How long does scanning take?

Speed depends on how many files exist in the selected folder. A typical user folder with tens of thousands of files takes a few seconds. A full drive scan with hundreds of thousands of files may take 1-3 minutes. Progress is shown in real time.

Is the data stored after I close the page?

No. All scan results exist only in browser memory. Closing or refreshing the page clears everything.

Disk Space Analyzer FAQ