Freedom251 › Disk Defragmentation Software
Defragger
What Defragger is
Defragger is a free, open-source Linux utility for examining filesystem fragmentation and defragmenting supported volumes. Its graphical interface displays file, free-space, and metadata allocation in an adaptive block map, and the project also includes a command-line interface for listing, analyzing, defragmenting, and compacting volumes. It supports online defragmentation for ext4 and offline defragmentation and compaction for FAT16 and FAT32. FAT12 and exFAT are available for analysis only. The software is described as alpha, and the README recommends backing up important data. Ext4 has received the most testing; FAT write support is newer and is recommended first for disposable or fully backed-up volumes. Defragger requires Linux with Qt 6 and KDE Kirigami. The GUI and CLI run without elevated privileges; operations needing them use a PolicyKit-authorized helper over D-Bus. Privileged mode requires systemd and an active graphical PolicyKit agent. It is dual-licensed under MIT or Apache License 2.0.
Who it suits
It suits Linux users who need to inspect allocation or defragment supported ext4 or FAT volumes and can meet its desktop requirements. Users considering FAT write operations should account for the project's backup caution.
What it does well
- Graphical block map shows files, free space, and metadata
- Supports online ext4 defragmentation
- CLI can analyze, defragment, and compact volumes
- Dual-licensed under MIT or Apache License 2.0
What to know first
- Project describes the software as alpha
- FAT write support is newer
- FAT12 and exFAT are analysis-only
- Requires Linux, Qt 6, and KDE Kirigami
Limits
The free Open-source plan is alpha software for Linux, with write support for ext4 and offline FAT16/FAT32. FAT12 and exFAT are analysis-only; privileged operations also require systemd, PolicyKit, and an active graphical PolicyKit agent.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Open-source | Alpha software · Linux only · ext4 and offline FAT16/FAT32 write support | Free |
As github.com lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the project at https://github.com/gbin/defragger.
- Use a Linux system with Qt 6 and KDE Kirigami.
- For privileged operations, ensure systemd, PolicyKit, and an active graphical PolicyKit agent are available.
- Choose the GUI or command-line interface to list or analyze a volume.
- Back up important data before defragmenting; use disposable or backed-up volumes for newer FAT write support.
Verdict
Defragger provides both visual analysis and command-line operations, but its alpha status and backup warnings matter. Its write support is limited to ext4 and offline FAT16/FAT32.
Questions
How much does Defragger cost?
The Open-source plan is free.
Is Defragger open source?
Yes. It is dual-licensed under MIT or Apache License 2.0.
Which platforms and filesystems does it support?
It is for Linux. It supports online ext4 defragmentation and offline FAT16/FAT32 defragmentation and compaction; FAT12 and exFAT can be analyzed only.
Does Defragger have a command-line interface?
Yes. It can list, analyze, defragment, and compact volumes.
What does the system need for privileged operations?
The stated environment includes Linux, Qt 6, and KDE Kirigami. Privileged mode additionally requires systemd, PolicyKit, and an active graphical PolicyKit agent.
Who makes Defragger?
The README credits copyright 2026 to Guillaume Binet. The maker's GitHub profile lists Austin, TX.
Facts from Defragger's own pages
- Analysis
- It analyzes fragmentation and displays an adaptive filesystem block map. · github.com, 4 Oct 2026
- CLI
- The project includes a command-line interface for listing, analyzing, defragmenting, and compacting volumes. · github.com, 4 Oct 2026
- Data safety
- The README warns that the software is alpha, recommends backing up important data, and says ext4 has received the most testing. · github.com, 4 Oct 2026
- FAT caution
- FAT write support is newer and the README recommends first using it with disposable or fully backed-up volumes. · github.com, 4 Oct 2026
- Filesystem support
- It supports online ext4 defragmentation and offline FAT16/FAT32 defragmentation and compaction. · github.com, 4 Oct 2026
- Integrations
- For ext4 operations, Defragger uses Linux filesystem ioctls directly and says it does not shell out to e4defrag or filefrag. · github.com, 4 Oct 2026
- License
- Defragger is dual-licensed under MIT or Apache License 2.0. · github.com, 4 Oct 2026
- Linux requirements
- The stated environment is Linux with Qt 6 and KDE Kirigami, while privileged mode requires systemd, PolicyKit, and an active graphical PolicyKit agent. · github.com, 4 Oct 2026
- Maker
- The README credits copyright 2026 to Guillaume Binet, and the maker's GitHub profile lists Austin, TX. · github.com, 4 Oct 2026
- Privilege handling
- The GUI and CLI run unprivileged, with elevated operations handled by a PolicyKit-authorized helper over D-Bus. · github.com, 4 Oct 2026
- Purpose
- Defragger is a graphical Linux filesystem defragmenter that visualizes file, free-space, and metadata allocation. · github.com, 4 Oct 2026
- Read-only formats
- FAT12 and exFAT support analysis only; neither is writable. · github.com, 4 Oct 2026
- Support
- The repository exposes GitHub Issues, which showed zero open issues when viewed. · github.com, 4 Oct 2026
Where Defragger stands on Freedom251
- Disk Defragmentation Software#4 of 20