fdupes
fdupes: A focused open-source tool for exact duplicate matching in specified directories. Ranked #23 of 37 in Duplicate File Finders by our editors (6.3/10); pricing: Free plan; best for command-line users needing basic exact matching.
At a glance
- Editor score6.3 / 10
- PricingFree plan
- Best forCommand-line users needing basic exact matching
- Free planYes
- Paid fromFree
- Platform coverageCross-platform
- Facts checked25 Sep 2026
Where it wins
- Compares sizes, MD5 signatures, and contents byte by byte
- Scans subdirectories and can follow symbolic links
- Offers interactive or automatic duplicate deletion
Where it doesn't
- Requires comfort with terminal-based tools
- Installation instructions target Unix-like systems
- Deletion workflows require careful file selection
Our verdict on fdupes
fdupes is an open-source command-line utility for identifying duplicate files in specified directories. It is aimed at users who are comfortable working in a terminal and want a focused way to locate exact duplicates rather than manage files through a graphical interface. The program groups matching files after comparing file sizes, MD5 signatures, and contents byte by byte. Recursive scanning, size filters, summaries, and symbolic-link handling support more targeted searches across directory trees.
Its strongest feature is the layered matching process. File size and MD5 signatures help organize comparisons, while byte-by-byte checking is used to identify matching contents. Users can filter files by minimum or maximum size, summarize duplicate-file information, and cache file signatures in a database. These options make fdupes suitable for repeat scans and for narrowing searches before reviewing results. The published functionality also includes scanning specified directories, subdirectories, and symlinked directories when requested.
Deletion is available in two forms: interactive selection of files to preserve, and non-interactive deletion that preserves the first copy. That gives experienced command-line users a choice between review-oriented cleanup and automation. The trade-off is that the workflow depends on terminal commands and deliberate file handling, with no graphical review experience described in the product information. Source-code installation instructions and Unix-like dependencies make it a practical fit for users already working in that environment. Choose fdupes for basic, exact duplicate detection and scripted or interactive cleanup; choose another tool if you need a graphical interface or broader platform guidance.
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fdupes pricing
fdupes fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Platform coverage | Cross-platform |
| Scan locations | Specified local directories and their subdirectories; follows symlinks when enabled |
| Match methods | File signatures/cache and byte-for-byte comparison; can account for hard links and permissions |
| File preview | No |
| Automatic selection | Yes |
| Recycle Bin / Trash | No |
| Folder exclusions | No |
| Deployment | Self-hosted |
| Platforms | Linux, macOS |
| Support | Community |
| Built for | Solo (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 25 Sep 2026 |
Alternatives to fdupes
- AllDupA fully free Windows duplicate finder with broad matching and cleanup controls.9.0
- CzkawkaA free, scriptable duplicate finder for technical users across Windows, macOS, Linux, and Android.8.8
- Wise Duplicate FinderA Windows duplicate finder with free manual cleanup and Pro date-based selection.8.7
Also Ranked In
fdupes is ranked in 3 of our directories.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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