Reclaim gigabytes of duplicate files on your PC.
superdeduper finds every duplicate on your drive — photos, videos, downloads, that folder of "final_FINAL_v3" — in minutes instead of hours. Built from the ground up for Windows.
Windows 10 & 11 · 64-bit · ~5 MB · No installer required
Built for real-world Windows drives
Other dedupers treat Windows like an afterthought. We treat it like the platform — and you can feel it.
Massively faster scans
Reads your drive in the physical order files are stored, not the alphabetical order Windows shows them. On a spinning hard drive that turns a 30-minute scan into a few minutes.
Instant re-scans
The second time you scan the same drive, it finishes in seconds. superdeduper remembers what's changed and only re-checks the new and modified files.
Reversible by default
Duplicates go to the Recycle Bin, not into the void. Every
destructive action asks you to type DELETE first, and
archive mode keeps a manifest so you can put files back exactly
where they were.
Cryptographically certain
When superdeduper says two files are identical, they are — bit for bit. No more "are these really the same?" — it uses a modern cryptographic fingerprint that's impossible to fool.
Knows real duplicates from shortcuts
Windows can store the same file in multiple places without actually copying it. superdeduper sees through that and won't tell you to delete something that wouldn't free any space anyway.
Verified safe downloads
Every release is cryptographically signed and built in public. You can verify your download came from this exact source code, with a single command. No surprises in the binary.
Three steps. No surprises.
- 1
Scan
Point superdeduper at a folder or whole drive. Watch the progress bar — that's it.
- 2
Review
Browse duplicate groups, see exactly which copy will be kept and why. Override anything you don't agree with.
- 3
Reclaim
Send the duplicates to the Recycle Bin, replace them with shortcuts to save space, or archive them with a manifest you can restore later.
See how your PC stacks up.
Opt-in leaderboard. Compare scan times against other users with similar CPUs, RAM, and drive types. Bragging rights for whoever finds their bottleneck first.
We only collect hardware buckets and timings — never file names,
paths, or contents. Backend live at https://api.superdeduper.io.
⚠ This is alpha software
superdeduper performs destructive operations on files. The defaults are reversible (Recycle Bin, archive with manifest), but bugs can still cause data loss. Always back up first. Test on copies before pointing it at originals. See SECURITY.md for the full safety story.