Browser tools

Interactive Storage Tools

These three tools run entirely in your browser. The treemap uses a fixed demonstration dataset. The calculator and converter use only the numbers you type. Nothing on this page reads your disks, requests filesystem access, or pretends to scan a computer.

These three tools need JavaScript to calculate and draw. The written explanations and the sample size list stay available without it. The guides linked from this page are readable either way.

Interactive disk treemap

Rectangle area is proportional to the sample size. Choose a folder to open it, then use the breadcrumb or “Up one level” to move back. Tab reaches each rectangle. Enter or Space activates the focused one. The detail panel repeats the size in text.

Applications
Documents
Pictures
Videos
Downloads
Backups
System Data

The interactive map appears when JavaScript runs. The sample sizes are listed below either way.

Demo drive (simulated)

Choose a rectangle to read its sample size. All of these figures are simulated.

Sample sizes in this tool

Applications 48 GB · 21.1%
Installed software in the sample, including a design suite with subfolders.
- Design suite 18 GB
  - App files 12 GB
  - Caches 4 GB
  - Presets 2 GB
- Game library 16 GB
- Browsers 6 GB
- Utilities 8 GB
Documents 12 GB · 5.3%
Office files, PDFs, and project notes.
- Office files 4.2 GB
- PDFs 3.1 GB
- Project notes 4.7 GB
Pictures 22 GB · 9.6%
Camera photos, screenshots, and edited images.
- Camera roll 14 GB
- Screenshots 3 GB
- Edited photos 5 GB
Videos 64 GB · 28.1%
The largest sample category: project footage, exports, and short clips.
- Project footage 40 GB
- Exports 18 GB
- Short clips 6 GB
Downloads 18 GB · 7.9%
Installers, archives, and other downloaded files.
- Installers 11 GB
- Archives 5 GB
- Other downloads 2 GB
Backups 36 GB · 15.8%
Disk images and phone backups kept on the sample drive.
- Disk images 28 GB
- Phone backups 8 GB
System Data 28 GB · 12.3%
A simplified stand-in for Windows files, restore points, and temporary files.
- Windows files 16 GB
- Restore points 8 GB
- Temporary files 4 GB

Storage usage calculator

Enter the total disk capacity, the space already used, and any additional usage you are planning. Available space is capacity minus used space. Remaining space is available space minus the planned addition. Used percent is used space divided by capacity.

On a 512 GB disk with 470 GB used, available space is 42 GB. Planning to add 20 GB leaves 22 GB. Use the example button to load those figures, or type your own. Keep one unit for all three fields. GB here means decimal gigabytes. GiB means gibibytes.

File size converter

Decimal units step by 1,000. Binary units step by 1,024. One GB is 1,000,000,000 bytes. One GiB is 1,073,741,824 bytes, so 1 GB is about 0.9313 GiB. A drive sold as 1 TB holds 1,000,000,000,000 bytes, which is about 931.32 GiB. Windows has historically divided by 1,024 while still showing the labels KB, MB, and GB, which is why the capacity in File Explorer can look smaller than the number on the box.

Exact byte factors used by the converter
Unit	Bytes	Family
KB	1,000	Decimal
MB	1,000,000	Decimal
GB	1,000,000,000	Decimal
TB	1,000,000,000,000	Decimal
KiB	1,024	Binary
MiB	1,048,576	Binary
GiB	1,073,741,824	Binary
TiB	1,099,511,627,776	Binary

The visualizer guide explains how to read a map like the one above. The analyzer guide explains what a real scan would be counting. The about page lists what these tools cannot do.