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Software · Development

KDiff3

A file and folder comparison and merge tool.

  • Completely free
  • Windows and Linux
  • Open source
  • No account

Overview

KDiff3 is a file comparison program, available on Windows and Linux.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “A file and folder comparison and merge tool” — official website, 10 November 2026

At a glance

KDiff3 is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-2.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

About

KDiff3 is a file and folder diff and merge tool which compares and merges two or three text input files or folders, shows the differences line by line and character by character(!), provides an automatic merge-facility, has an editor for comfortable solving of merge-conflicts, provides network transparency via KIO, has options to highlight or hide changes in white-space or comments, supports Unicode, UTF-8 and other file encodings, prints differences, supports version control keyword and history merging.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 7 November 2026
  • Description from Flathub — AppStream (Flathub)

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