Disk visualizer for WindowsInteractive sunburst100% on device
Where did all your disk space go?
Every folder on your drive drawn as a proportional arc. Click any slice to zoom in, hover to see the exact size, and find that hidden 40 GB folder in seconds. Nothing running in the background, no indexing service, no cloud.
v1.0.0 beta · Windows 10 (1809+) & 11 · 64-bit · Installs without admin rights · No account
01 How it works
Point. Scan. Drill. Reclaim.
Point it at a drive or folder
Pick a drive from the launcher, Ctrl O to open a folder, Ctrl Shift H to scan your user folder, or just drop a folder onto the window.
Watch it scan
A background scan walks the tree with a live item counter, measuring the on-disk space each file actually uses. Cancel any time. Nothing is touched.
Read the sunburst
Every file and folder becomes a slice, sized by how much space it takes. Hover to light up its lineage, double-click or Enter to drill in, and use the breadcrumb to jump back up.
Reclaim the space
Found the hog? Select it and press Delete. Diskr moves it to the Recycle Bin after a confirmation, then every parent ring shrinks live. Never a hard delete.
02 Features
One picture of your whole disk.
The sunburst turns a drive full of files into a single glance, and the one destructive action it has always goes through a confirmation and the Recycle Bin.
The interactive sunburst
A recursive radial map, up to six rings deep. Each slice's angle is proportional to how much space it takes and is colored by its top-level branch, so colors stay put as you drill. Hover any slice to light up its whole lineage and read a name, size and percent tooltip.
The headline
Size on disk and logical size
Windows charges you for whole clusters, and NTFS compression and sparse files make the two numbers diverge badly. Diskr reports both and switches between them instantly, without rescanning. A 1-byte file really does cost a full cluster, and now you can see it.
On disk · Logical
Junctions & symlinks, never followed
C:\Users\All Users points at C:\ProgramData, and a scanner that follows it counts ProgramData twice. Some Windows reparse points even point in a loop. Diskr draws every one of them so you know it's there, and counts it as zero.Hardlinks counted once
WinSxS, pnpm stores and Docker layers share the same clusters under many names. Diskr charges those bytes to the first name it sees and tells you how much double-counting it avoided, instead of quietly inflating your totals.
Real totals
Drill down & breadcrumb
Double-click a slice or press Enter to recentre the chart on that folder. Click the centre disk (or press Backspace) to go back up a level, or use the breadcrumb to jump anywhere in one click.
Dive in
A sidebar that is a real table
The current folder's contents, listed with name, size and share, sortable and always agreeing with the chart. It's the chart's keyboard and screen-reader equivalent, not a second copy of the data drifting out of sync with it.
Name · Size · Share
Right-click anything
From a slice or a sidebar row: Open, Open with, Reveal in File Explorer, Copy path, and Move to Recycle Bin. Inspect a suspect file before you decide to clear it.
Open · Reveal · Recycle
It will not delete Windows
Diskr refuses to bin drive roots, the Windows folder, Program Files, ProgramData, your profile and its standard folders, AppData, and its own install directory. It says which one you hit and why. Anything inside those is fair game, because clearing a cache folder is the whole point.
Protected paths
No hard deletes, ever
Removing an item moves it to the Recycle Bin after a confirmation dialog. Shift Delete is intercepted and routed to the same confirmation, because muscle memory shouldn't cost you a folder. An item too large for the Recycle Bin gets Windows' own warning instead of a silent hard delete.
Always recoverable
Folders it couldn't read are reported
A scan never aborts on an access-denied folder. A banner says how many were skipped and offers Restart as administrator if you want them counted (the only time Diskr ever asks for elevated rights, and only because you clicked it).
Never hidden
Volume capacity at a glance
Used versus free on the scanned drive, alongside the totals for whatever you're currently looking at, so a folder's size always has context.
Updates itself
Diskr checks for a new version automatically about once a week: never a pop-up, and you can turn it off. When you install one, it verifies the installer's signature and version before running it, then reopens where you left off.
Self-update
100% on your PC
Diskr only ever sees the folders you point it at, and everything happens locally: no account, no cloud, no usage analytics, nothing uploaded. The only network call it ever makes is its weekly check for a new version, and you can switch that off.
Privacy
13 languages
English, Spanish, French, German, Italian, Portuguese (BR), Dutch, Polish, Russian, Turkish, Japanese, Simplified Chinese and Korean, detected from your Windows display-language settings, including every Recycle Bin confirmation, which is exactly where you least want to be reading a language you don't speak.
Localized
Light, dark, or follow Windows
The whole window (chart, sidebar and title bar included) follows whichever you pick, with contrast that stays readable in both.
Built for everyone
Every control reachable by keyboard with a visible focus ring, the chart itself navigable with the arrow keys and announced as you move, live regions that stay quiet unless something happened, reduced-motion support, Windows High Contrast, and no sideways scrolling at any window size. WCAG 2.1 AA.
WCAG 2.1 AA
03 What the sunburst shows
Up to 6 rings
Sized by on-disk bytes
Colored by branch
Hover to light up lineage
Double-click to drill
Breadcrumb to jump back
Volume capacity bar
04 Beta
You're testing the first Windows build.
Diskr has been on the Mac for a while. This is the Windows port's first public build: same sunburst, same safety guarantees, rebuilt on Windows APIs and Windows' own idea of a drive.
What would help most
Real drives, real folders
Your own drives, especially ones with junctions, symlinks, deep nesting, or a few hundred thousand files. Tell me if a size looks wrong.
The delete path
Move something to the Recycle Bin, try Shift Delete, and try to trash a folder you shouldn't be able to. Check that the refusal makes sense.
The install itself
Whether SmartScreen let you through, whether the shortcut and taskbar icon look right, whether uninstall leaves anything behind.
Anything that looks wrong
Clipped text, a scrollbar where there shouldn't be one, an odd translation, a dialog you couldn't reach with the keyboard.
06 Pricing
Free. For everyone.
Diskr is free for everyone, at home and at work. No license, no account, no nag screens, no watermarks, ever.
Personal
Free forever
For individuals and personal projects
- The full app, every feature
- No account, no nag screens
- Free updates forever
At work
Free commercial too
No license, no subscription
- Everything in Personal
- Use it commercially at work, free
- No license to buy, ever
- Free updates forever
Diskr is free for everyone, including commercial use at work. There is no license to buy and no subscription. The same app runs on the Mac and Windows builds.
07 Download & install
Get set up in about a minute.
Run the installer and Diskr lands in your own user folder: no admin password, no UAC prompt, nothing else to install.
Version 1.0.0 beta · Diskr-Setup.exe · about 12 MB · Free updates forever
Windows 10 (version 1809 or later) or Windows 11 · 64-bit
Everything Diskr needs is inside the installer: no Python, no runtime to chase down. It does use the Microsoft Edge WebView2 Runtime to draw its interface, which ships with Windows 11 and reaches almost every Windows 10 machine through Windows Update. On the rare PC without it, Diskr will say so on launch and Microsoft's free installer is a one-click fix.
No admin rights needed
Diskr installs per-user into
%LOCALAPPDATA%\Programs\Diskr, so there's no UAC prompt and no argument with your IT department. It scans whatever your own Windows account can already read; if a scan hits a folder it can't, a banner offers a user-initiated Restart as administrator, the only situation where Diskr ever asks for elevated rights. Uninstall from Settings → Apps → Installed apps like anything else.Windows may warn you the first time. Here's the honest story.
Diskr is Authenticode-signed, so the publisher shows as a real, verified name rather than "Unknown publisher." But signing alone does not switch SmartScreen off: Microsoft builds reputation per file, and a brand-new build starts with none. Until this exact file has been downloaded enough times, you may still see a blue "Windows protected your PC" box.
- Click More info
- Check the publisher name shown
- Click Run anyway
08 FAQ
Common questions.
Is Diskr really free?
Personal use is free forever: the full app, unlimited scans, no account, no trial timer, no nag screens. It is free for commercial use at work too, with no license to buy and no account.
Can Diskr delete my files?
Only when you explicitly choose Delete. That moves the item to the Recycle Bin, with a confirmation dialog first, never a hard delete. Shift Delete is intercepted and routed to the same confirmation, so muscle memory can't skip it. Diskr also refuses outright to trash the folders Windows depends on: drive roots, the Windows folder, Program Files, ProgramData, your user profile and its standard folders, AppData, and Diskr's own install directory. Scanning itself only reads file names and sizes; the one time Diskr asks for more than your account already has is the user-initiated Restart as administrator button on the access-denied banner.
What can I scan?
Any drive or folder you point it at. Pick a drive card from the launcher, use Open Folder… (Ctrl O), Scan Your User Folder (Ctrl Shift H), or just drop a folder onto the window. The scan runs in the background with a live item counter and can be cancelled at any time.
Why does a scan skip some folders?
Diskr can only read what your Windows account can read: the same limits File Explorer has. A scan never aborts on an access-denied folder; a banner reports how many were skipped and explains why. If you want them included, the banner offers Restart as administrator: a deliberate, user-initiated relaunch, and the only time Diskr ever asks for elevated rights.
Why is a folder's size different from what File Explorer shows?
Windows charges disk space in whole clusters, and NTFS compression and sparse files can make the space a file actually occupies on disk diverge a lot from its logical byte count. Diskr measures and shows both (size on disk and logical size), and you can switch between them instantly without rescanning, so you can see exactly why the two numbers disagree.
How deep does the sunburst go?
The chart draws up to six concentric rings at once, each slice sized by how much space it takes. To see deeper, double-click a slice (or press Enter) to recentre the chart on that folder; then its contents become the new outer rings. The breadcrumb and the centre disk take you back up.
What are those junctions and hardlinks it mentions?
Windows has folders that quietly point at other folders (
C:\Users\All Users really is C:\ProgramData) and files that share the same bytes under different names, which is how WinSxS, pnpm and Docker save space. A scanner that follows the first double-counts space, and one that ignores the second inflates it. Diskr draws junctions and symlinks without following them, and charges shared bytes to only the first name it sees, telling you how much double-counting it avoided.Does Diskr upload anything?
No. Nothing about your disks leaves your PC. The whole scan happens locally: file names, sizes and paths are never uploaded, and there is no account and no usage analytics. The only network call Diskr ever makes is a weekly check for a new version, which sends the app version and nothing else, and you can turn it off.
Why did Windows show a blue "protected your PC" warning?
Because the file is new, not because it's unsigned. SmartScreen builds trust per file over downloads and time, and a fresh build starts from zero. Code signing gives you a verified publisher name in the dialog but does not skip the warning. Click More info → check the publisher → Run anyway. See the install section for the full explanation.
How do I update Diskr?
It updates itself. Diskr quietly checks about once a week for a new version: never a pop-up, and you can turn the check off in Settings. Installing one verifies its signature and version before running anything, installs over itself and reopens where you left off.
How is this different from the Mac version?
Same sunburst, same safety guarantees. The engine was rebuilt on Windows APIs rather than macOS ones. A few things are genuinely different: Windows gets two size numbers (on-disk and logical) where the Mac build shows one; Diskr for Windows sidesteps junctions and mount points in addition to symlinks; there's no Full Disk Access prompt to grant, since unreadable folders are just reported as a count instead; and removed items go to the Recycle Bin, with its own rules for oversized or too-long paths, rather than the macOS Trash.
Where do my settings live, and what does uninstalling remove?
Preferences and your recent-scans list sit in
%APPDATA%\Diskr. Uninstalling removes the app from %LOCALAPPDATA%\Programs\Diskr but deliberately leaves %APPDATA%\Diskr alone, so a reinstall finds your settings intact. Delete it yourself if you want every trace gone. Nothing is written outside your user account, and nothing goes in the registry beyond the uninstall entry.