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com github qarmin czkawka

Czkawka (tch•kav•ka (IPA: [ˈʧ̑kafka]), "hiccup" in Polish) is a simple, fast and free app to remove unnecessary files from your computer.


  • Written in memory-safe Rust
  • Amazingly fast - due to using more or less advanced algorithms and multithreading
  • Free, Open Source without ads
  • Multiplatform - works on Linux, Windows, macOS, FreeBSD and many more
  • Cache support - second and further scans should be much faster than the first one
  • CLI frontend - for easy automation
  • GUI frontend - uses GTK 4 framework and looks similar to FSlint
  • No spying - Czkawka does not have access to the Internet, nor does it collect any user information or statistics
  • Multilingual - support multiple languages like Polish, English or Italian
  • Multiple tools to use:
    • Duplicates - Finds duplicates based on file name, size or hash
    • Empty Folders - Finds empty folders with the help of an advanced algorithm
    • Big Files - Finds the provided number of the biggest files in given location
    • Empty Files - Looks for empty files across the drive
    • Temporary Files - Finds temporary files
    • Similar Images - Finds images which are not exactly the same (different resolution, watermarks)
    • Similar Videos - Looks for visually similar videos
    • Same Music - Searches for similar music by tags or by reading content and comparing it
    • Invalid Symbolic Links - Shows symbolic links which point to non-existent files/directories
    • Broken Files - Finds files that are invalid or corrupted
    • Bad Extensions - Lists files whose content not match with their extension


Usage, installation, compilation, requirements, license

Each tool uses different technologies, so you can find instructions for each of them in the appropriate file:


Since Czkawka is written in Rust and it aims to be a faster alternative to FSlint or DupeGuru which are written in Python, we need to compare the speed of these tools.

I tested it on a 256 GB SSD and an i7-4770 CPU.

I prepared a disk and performed a test without any folder exceptions and with disabled ignoring of hard links. The disk contained 363 215 files, took 221,8 GB and had 62093 duplicate files in 31790 groups which occupied 4,1 GB.

I set the minimal file size to check to 1KB on all programs.

App Executing Time
FSlint 2.4.7 (First Run) 86s
FSlint 2.4.7 (Second Run) 43s
Czkawka 3.0.0 (First Run) 8s
Czkawka 3.0.0 (Second Run) 7s
DupeGuru 4.1.1 (First Run) 22s
DupeGuru 4.1.1 (Second Run) 21s

I used Mprof for checking memory usage of FSlint and DupeGuru, and Heaptrack for Czkawka.

App Idle Ram Max Operational Ram Usage Stabilized after search
FSlint 2.4.7 62 MB 164 MB 158 MB
Dupeguru 4.1.1 90 MB 170 MB 166 MB
Czkawka 3.0.0 12 MB 122 MB 60 MB

In Dupeguru, I enabled checking images with different dimensions to match Czkawka behavior. Both apps use a caching mechanism, so the second scan is really fast.

Similar images which check 10949 files that occupied 6.6 GB

App Scan time
Czkawka 3.0.0 (First Run) 276s
Czkawka 3.0.0 (Second Run) 1s
DupeGuru 4.1.1 (First Run) 539s
DupeGuru 4.1.1 (Second Run) 1s

Similar images which check 349 image files that occupied 1.7 GB

App Scan time
Czkawka 3.0.0 (First Run) 54s
Czkawka 3.0.0 (Second Run) 1s
DupeGuru 4.1.1 (First Run) 55s
DupeGuru 4.1.1 (Second Run) 1s

Comparison to other tools

Bleachbit is a master at finding and removing temporary files, while Czkawka only finds the most basic ones. So these two apps shouldn't be compared directly or be considered as an alternative to one another.

In this comparison remember, that even if app have same features they may work different(e.g. one app may have more options to choose than other).

Czkawka Krokiet FSlint DupeGuru Bleachbit
Language Rust Rust Python Python/Obj-C Python
Framework base language C Rust C C/C++/Obj-C/Swift C
Framework GTK 4 Slint PyGTK2 Qt 5 (PyQt)/Cocoa PyGTK3
OS Lin,Mac,Win Lin,Mac,Win Lin Lin,Mac,Win Lin,Mac,Win
Duplicate finder
Empty files
Empty folders
Temporary files
Big files
Similar images
Similar videos
Music duplicates(tags)
Invalid symlinks
Broken files
Names conflict
Invalid names/extensions
Installed packages
Bad ID
Non stripped binaries
Redundant whitespace
Overwriting files
Multiple languages
Cache support
In active development Yes No Yes Yes

Other apps

There are many similar applications to Czkawka on the Internet, which do some things better and some things worse:


  • DupeGuru - Many options to customize; great photo compare tool
  • FSlint - A little outdated, but still have some tools not available in Czkawka
  • AntiDupl.NET - Shows a lot of metadata of compared images
  • Video Duplicate Finder - Finds similar videos(surprising, isn't it), supports video thumbnails


Due to limited time, the biggest emphasis is on the GUI version so if you are looking for really good and feature-packed console apps, then take a look at these:

  • Fclones - One of the fastest tools to find duplicates; it is written also in Rust
  • Rmlint - Nice console interface and also is feature packed
  • RdFind - Fast, but written in C++ ¯\_(ツ)_/¯


Contributions to this repository are welcome.

You can help by creating:

  • Bug reports - memory leaks, unexpected behavior, crashes
  • Feature proposals - proposal to change/add/delete some features
  • Pull Requests - implementing a new feature yourself or fixing bugs. If the change is bigger, then it's a good idea to open a new issue to discuss changes, but issues with label PR welcome are already checked and accepted.
  • Documentation - There is an instruction which you can improve.
  • Translations - Instruction how to translate files is available here
  • External contributions - App use big number of external libraries like lofty, image-rs or symphonia so improving this libraries will automatically improve Czkawka

You can also help by doing other things:


Big thanks to Pádraig Brady, creator of fantastic FSlint, because without his work I wouldn't create this tool.

Thanks also to all the people who create patches for this program, make it available on other systems, create videos, articles about it etc.

Also, I really appreciate work of people that create crates on which Czkawka is based and for that I try to report bugs to make it even better.


If you are using the app, I would appreciate a donation for its further development, which can be done here.