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Defragger

Free#10 of 20 in Disk Defragmentation Software

Defragger: A free, open-source Linux tool for analyzing and defragmenting several filesystem types. Ranked #10 of 20 in Disk Defragmentation Software by our editors (7.2/10); pricing: Open source; best for linux multi-filesystem defragmentation.

7.2/10Editor score

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At a glance

Editor score
7.2 / 10
Pricing
Open source
Best for
Linux multi-filesystem defragmentation
Paid from
Free
Facts checked
20 Sep 2026

Where it wins
- Supports online ext4 defragmentation
- Handles offline FAT16/FAT32 defragmentation and compaction
- Combines a graphical interface with a command-line interface
Where it doesn't
- Designed for Linux desktops only
- FAT16/FAT32 operations require offline volumes
- The project is described as alpha software

Our verdict on Defragger

Defragger is a free, open-source filesystem defragmentation tool for Linux desktops. It is aimed at users who need visibility into filesystem allocation and support across ext4, FAT16, FAT32, FAT12, and exFAT. The graphical application visualizes file, free-space, and filesystem-metadata allocation, while its command-line interface provides another way to work with the tool. The project uses Qt 6 and KDE Kirigami, with PolicyKit authorization for privileged operations.

Its main strength is the combination of analysis and targeted filesystem operations. Defragger can analyze fragmentation, perform online ext4 defragmentation, and defragment offline FAT16/FAT32 volumes. It also supports offline FAT16/FAT32 compaction, while FAT12 and exFAT are included for analysis. Progress reporting and safe cancellation make the workflow easier to monitor. This multi-filesystem coverage gives it a broader scope than a tool focused on a single filesystem, although the supported actions differ by filesystem.

Defragger is a fit for Linux users who want an open-source utility with both allocation-map visualization and command-line access. The published project description presents it as alpha filesystem software and recommends backing up important data before use, so it is better suited to users comfortable with that maturity level than to teams seeking a mature, hands-off maintenance product. Choose it for Linux-based inspection and manual defragmentation across ext4 and FAT volumes; look elsewhere if your environment depends on another operating system or requires defragmentation workflows beyond the listed filesystem operations.

Your product? Our editors can test Defragger in depth and publish a review, labelled as paid · from $149/mo →

Defragger pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on github.com

Defragger fact sheet

Free plan	Not verified
Paid from	Free
Drive types	Not verified
Scheduled optimization	Not verified
Automatic optimization	Not verified
Boot-time optimization	Not verified
Filesystem support	Multi-filesystem
Maximum drive count	Not verified
Deployment	Desktop
Platforms	Linux
Support	Docs
Built for	Solo, Small business (editorial estimate)
Pricing	Open source
Website	github.com
Facts checked	20 Sep 2026

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Featured on iTechGuides

Defragger is listed in our Disk Defragmentation Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update