KDiff3 is an open source graphical text difference analyzer for up to 3 input files, provides character-by-character analysis and a text merge tool with integrated editor.
It can also compare and merge directories.
KDiff3 runs best on KDE but can be built without it.
Features include:
- Intuitive graphical user interface.
- Compares or merges two or three text input files or directories.
- Shows the differences line by line and character by character.
- Automatic merge-facility.
- Integrated editor for comfortable solving of merge-conflicts.
- Supports Unicode, UTF-8 and other codecs, autodetection via byte-order-mark “BOM”.
- Supports KIO on KDE (allows accessing ftp, sftp, fish, smb etc).
- Printing of differences.
- Manual alignment of lines.
- Automatic merging of version control history.
- KDE-Konqueror/Dolphin service menu plugin.
Website: invent.kde.org/sdk/kdiff3
Support:
Developer: Joachim Eibl
License: GNU General Public License v2.0

KDiff3 is written in C++. Learn C++ with our recommended free books and free tutorials.
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kdiff3 project moved to KDE infrastructure long times ago. Links provided in the article are outdated.
Link updated, thanks.