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fdupes vs Rdfind: catalog facts
fdupes	Rdfind
Free Free and open source.	Free Free software under GPL-2.0-or-later.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Finds duplicates by file content Interactive or automatic deletion	Finds duplicates based on file content rather than filenames Default run creates a results file without removing files
Terminal only, with no graphical interface Deleting files needs care to avoid removing the wrong copy	Windows use is through Cygwin
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0-or-later
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.