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Tech riderRev. 1 Oct 2026

fclones

Ch 047.2of 38 Duplicate File Finders
  1. 1Runs onLinux, Mac, Windows
  2. 2CostsFree plan
  3. 3Platform coveragecross-platform
  4. 4Scan locationsDirectory trees, multiple directory roots, standard-input file lists, and mounted or removable devices
  5. 5Match methodsFile size, inode/file identifiers, prefix hash, suffix hash, and full-content hash
  6. 6File previewYes
  7. 7Automatic selectionYes
  8. 8Folder exclusionsYes
8 lines stated Written from the maker's own pages: github.com
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Overview

fclones is ranked #4 of 38 in duplicate file finders on Specifiction. It runs on Linux, macOS, Windows. There is a free plan.

fclones plans and pricing

All plans
Open-source fclones Free MIT license · command-line utility github.com · 1 Oct 2026

Compared on duplicate file finders

Free plan
Yesgithub.com
Platform coverage
cross-platformgithub.com
Scan locations
Directory trees, multiple directory roots, standard-input file lists, and mounted or removable devicesgithub.com
Match methods
File size, inode/file identifiers, prefix hash, suffix hash, and full-content hashgithub.com
File preview
Yesgithub.com
Automatic selection
Yesgithub.com
Folder exclusions
Yesgithub.com

Facts

Purpose
fclones identifies groups of identical files and removes unwanted copies.github.com · 1 Oct 2026
File operations
It can remove, move, or replace redundant files with soft or hard links.github.com · 1 Oct 2026
Deduplication
It can deduplicate file data using native copy-on-write reflinks on supported file systems.github.com · 1 Oct 2026
Selection
It supports multiple directory roots, standard-input file lists, recursion limits, glob and regular-expression filters, and minimum or maximum file sizes.github.com · 1 Oct 2026
Output
It provides standard text, fdupes-compatible, CSV, and JSON output formats.github.com · 1 Oct 2026
Integrations
The project says it integrates with Unix utilities such as find and speaks JSON.github.com · 1 Oct 2026
Safety controls
Users can inspect and modify duplicate lists before removal, and the --dry-run option reports filesystem changes without executing them.github.com · 1 Oct 2026
Performance
The Rust implementation parallelizes I/O and CPU-heavy stages and automatically tunes processing for SSDs and HDDs.github.com · 1 Oct 2026
Caching
Optional persistent hash caching can speed up repeated grouping and resume interrupted work.github.com · 1 Oct 2026
Security
The repository is released under the MIT license.github.com · 1 Oct 2026
Platform limit
Copy-on-write file-data deduplication is not supported on Windows.github.com · 1 Oct 2026
Linux optimization
Physical file-access ordering and page-cache drop-behind optimizations are unavailable on platforms other than Linux.github.com · 1 Oct 2026
Support
The project provides GitHub Issues and Discussions for community support.github.com · 1 Oct 2026

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Where it ranks on Specifiction

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