Windows · v1.0.0 · Free
Content-addressed deduplication for Windows. Your files, your machine — no cloud, no account, no telemetry.
Download for Windows — FreeHow it works
Pick any folders or drives. Winnow reads every file and computes a SHA-256 content hash — the fingerprint that never lies.
Duplicates are grouped by identical content — not name, not date. You see exactly what's redundant, how much space is wasted, and which copy to keep.
Move duplicates to a backup folder first — then delete with confidence. Or delete directly. Every operation shows you exactly what will happen before it does.
What Winnow is
No account. No cloud upload. No telemetry. Winnow runs entirely on your machine — your files never leave your drive.
0 bytes sent to any server · no network required
Two files are duplicates if and only if their SHA-256 hashes match. Rename a file, change its folder — Winnow still knows it's the same file.
SHA-256 · not name · not date · not size alone
The move-to-backup workflow copies duplicates to a folder of your choice before removal. Nothing is deleted until you explicitly say so.
copy → verify → delete · backup preserved
Installs once and works without an internet connection, forever. No subscription, no license server, no expiry. It's your software.
one-time install · no subscription · free
Winnow v1.0.0 for Windows
Free. No account. Runs on Windows 10 and 11.
Download Winnow — FreeNo cloud. No account. Winnow stores everything in a local SQLite database on your machine. Uninstall removes it completely.