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KDiff3

Free#8 of 28 in Diff and Merge ToolsFile Comparison Software

KDiff3: A free, cross-platform desktop choice for visual two- and three-file merges. Ranked #8 of 28 in Diff and Merge Tools by our editors (8.5/10); pricing: Open source; best for free cross-platform users wanting simple visual merges.

8.5/10Editor score

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KDiff38.5 Visit KDiff3

At a glance

Editor score
8.5 / 10
Pricing
Open source
Best for
Free cross-platform users wanting simple visual merges
Paid from
Free
Three-way merge
Yes
Facts checked
20 Sep 2026

Where it wins
- Supports two- and three-file comparison and merging
- Compares and merges folders with detailed difference views
- Works across Windows, macOS, and Linux with Git integration
Where it doesn't
- Desktop-focused rather than a broader platform service
- Does not provide syntax highlighting
- Merge workflows center on two- and three-file comparisons

Our verdict on KDiff3

KDiff3 is an open-source desktop diff and merge utility from KDE for developers and technical users. It compares two or three text files, merges files and folders, and presents differences at both line and character level. An editable conflict-resolution window supports direct decisions during a merge, while whitespace and comment highlighting helps separate meaningful changes from formatting noise. KDiff3 runs on Windows, macOS, and Linux under the GPL-2.0-or-later license.

Its strongest fit is a straightforward visual comparison workflow with practical support for common development tasks. The published feature set includes two- and three-file comparison, two- and three-file merging, folder comparison and merge, Unicode and UTF-8 support, and handling for other file encodings. Git integration allows KDiff3 to serve as a diff and merge tool, while KIO provides network-transparent file access. These capabilities give technical users a focused desktop utility for reviewing changes and resolving conflicts across files or folders.

KDiff3 keeps its scope focused rather than extending into a broader development environment. Its category specification lists desktop platform support and no syntax highlighting, so users who need language-aware code views may prefer a tool with that emphasis. The merge scope is centered on two- and three-file workflows, which suits common comparison and conflict-resolution tasks but may be less appropriate for teams seeking a wider collaboration platform. Choose KDiff3 for an open-source, cross-platform desktop tool with folder comparison, three-file merging, encoding support, and Git integration; choose an alternative if syntax-aware presentation or a broader hosted workflow is the priority.

Your product? Our editors can test KDiff3 in depth and publish a review, labelled as paid · from $149/mo →

KDiff3 pricing

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

See plans on apps.kde.org

KDiff3 fact sheet

Free plan	Not verified
Paid from	Free
Three-way merge	Yes
Folder comparison	Yes
Git integration	Yes
Syntax highlighting	No
Platform support	Desktop
Merge scope	Three_way
Deployment	Desktop
Platforms	Windows, macOS, Linux
Support	Community, Docs
Built for	Solo, Small business (editorial estimate)
Integrations	2 integrations: Git, KIO
Pricing	Open source
Website	apps.kde.org
Facts checked	20 Sep 2026

KDiff3 integrations

KDiff3 lists 2 integrations on its own site.

Alternatives to KDiff3

See all KDiff3 alternatives →

KDiff3 vs the competition

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Also Ranked In

KDiff3 is ranked in 2 of our directories.

#5File Comparison Software33 tools ranked

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Featured on iTechGuides

KDiff3 is listed in our Diff and Merge Tools 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

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Last updated 7 Oct 2026 · How we research and update