Shows what fills your disk
A folder list sorted by size above a treemap of every file, plus largest files, file types, duplicates, old files and empty folders.
Download
Download Bytopsy.
Bytopsy is a free, open-source disk analyzer, safe cleaner and PC maintenance tool for Windows. It shows what fills your drives, cleans caches and junk without touching what matters, and keeps drivers, apps and disks healthy.
Three steps, two minutes.
Releases are published on GitHub by the project's public build workflow.
- 1
Download the zip
From the latest release, take
bytopsy-<version>-x64.zipand the.sha256file next to it. - 2
Check it
In PowerShell, in the folder you saved them to. The two hashes must be the same.
Get-FileHash bytopsy-1.0.0-x64.zip Get-Content bytopsy-1.0.0-x64.zip.sha256 - 3
Unpack and run
Unpack it anywhere and start
bytopsy.exe, orbytopsy-cli.exein a terminal. To keep everything on a USB stick, put an emptybytopsy.portablefile next to them.
What you're installing.
Two native programs, the windowed app and the terminal app, with the same scanner. See the full tour.
Cleans without breaking things
Temporary files, browser and app caches, developer junk and AI models, each measured first and checked against protection rules.
Keeps drivers and apps current
Driver updates from Windows Update itself and app updates through winget, only the ones you confirm.
Watches disk health
Wear, temperature, spare capacity and errors from the drives' own health logs, with low disk space alerts.
Tidies startup and apps
Startup entries, services and scheduled tasks, and uninstalls that show the leftovers they leave behind.
Undoes what it did
Deletes go to the Recycle Bin by default and every delete is written to a journal you can restore from.
Code signing
Code signing policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
What gets signed
- Only
bytopsy.exeandbytopsy-cli.exe. - Only when the repository's public GitHub Actions workflow built them from a
v*tag of N604K/Bytopsy. Nothing built anywhere else is signed.
Until the SignPath Foundation accepts the project, releases are unsigned.
Who can sign
- Committers and reviewers
- Nativ Kdoshim
- Approvers
- Nativ KdoshimApproves each signing request by hand.
Everyone with these roles uses multi-factor authentication for GitHub and SignPath.
Check a signature
In PowerShell the status must be Valid, or open the file's Properties, Digital Signatures.
Get-AuthenticodeSignature .\bytopsy.exePrivacy
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it.