Czkawka (tch•kav•ka, hiccup) 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 and macOS
- Cache support - second and further scans should be a lot faster than the first one
- CLI frontend - for easy automation
- GUI frontend - uses modern GTK 3 and looks similar to FSlint
- Rich search option - allows setting absolute included and excluded directories, set of allowed file extensions
or excluded items with the
*wildcard - Multiple tools to use:
- Duplicates - Finds duplicates basing on file name, size, hash, first 1 MB of 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)
- Zeroed Files - Finds files which are filled with zeros (usually corrupted)
- Same Music - Searches for music with same artist, album etc.
- Invalid Symbolic Links - Shows symbolic links which points to non-existent files/directories
- Broken Files - Finds files with an invalid extension or that are corrupted
You can find an instruction on how to use Czkawka here.
Installation instruction with download links you can find here.
If you want try to develop Czkawka or just use the latest available feature, you may want to look at the compilation instruction.
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 a i7-4770 CPU.
I prepared a disk and performed a test without any folder exceptions and with disabled ignoring of hard links which contained 363 215 files, took 221,8 GB and had 62093 duplicate files in 31790 groups which took 4,1 GB.
Minimum file size to check I set to 1 KB 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 caching mechanism, so second scan is really fast.
Similar images which check 10949 files which took 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 which took 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 |
Bleachbit is a master at finding and removing temporary files, while Czkawka only finds the most basic ones. So this two apps shouldn't be compared directly or be considered as an alternative to the second one.
| Czkawka | FSlint | DupeGuru | Bleachbit | |
|---|---|---|---|---|
| Language | Rust | Python | Python/Obj-C | Python |
| OS | Lin,Mac,Win | Lin | Lin,Mac,Win | Lin,Mac,Win |
| Framework | GTK 3 | PyGTK2 | Qt 5 (PyQt)/Cocoa | PyGTK3 |
| Duplicate finder | • | • | • | |
| Empty files | • | • | ||
| Empty folders | • | • | ||
| Temporary files | • | • | • | |
| Big files | • | |||
| Similar images | • | • | ||
| Zeroed Files | • | |||
| Music duplicates(tags) | • | • | ||
| Invalid symlinks | • | • | ||
| Broken Files | • | |||
| Names conflict | • | • | ||
| Installed packages | • | |||
| Invalid names | • | |||
| Bad ID | • | |||
| Non stripped binaries | • | |||
| Redundant whitespace | • | |||
| Overwriting files | • | • | ||
| Multiple languages(po) | • | • | • | |
| Cache support | • | • | ||
| In active development | Yes | No | Yes | Yes |
Contributions to this repository are welcome.
You can help by creating a:
- 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.
- Documentation - There is an instruction which you can improve.
You can also help by doing different things:
- Creating text articles - LinuxUprising or Ubunlog
- Adding Czkawka to repositories - Alpine Linux or NixOS or OpenMandriva
- Creating videos - Tutorial Spanish 1 or Tutorial Spanish 2
- Recommending it to others
Czkawka is a Polish word which means hiccup.
I chose this name because I wanted to hear people speaking other languages pronounce it, so feel free to spell it the way you want.
This name is not as bad as it seems, because I was also thinking about using words like żółć, gżegżółka or żołądź, but I gave up on these ideas because they contained Polish characters, which would cause difficulty in searching for the project.
At the beginning of the program creation, if the response concerning the name was unanimously negative, I prepared myself for a possible change of the name of the program, and the opinions were extremely mixed.
Code is distributed under MIT license.
Icon is created by jannuary and licensed CC-BY-4.0.
Windows dark theme is used from AdMin repo with MIT license.
The program is completely free to use.
"Gratis to uczciwa cena" - "Free is a fair price"
If you are using the app, I would appreciate a donation for its further development, which can be done here.