Where Does KDiff3 Store Settings?
KDiff3 keeps the kdiff3rc settings file in ~/.config on Linux and in AppData on Windows.
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KDiff3 writes its options to a kdiff3rc file: diff colors, editor commands, directory filters, and merge behavior. Linux builds use ~/.config/kdiff3rc, Windows builds keep it in the AppData tree. Portable builds sit beside the exe.
Copy the file with KDiff3 closed to migrate. Recent file lists travel inside the same file. Version upgrades occasionally add keys, so keep a backup before first launch of a new release.
Where KDiff3 stores this, by platform
C:\Users\[You]\AppData\Roaming\kdiff3
kdiff3rc plus recent lists. Portable mode keeps the same files beside the exe. Match modes when restoring.
~/.config/kdiff3rc
Single settings file. KDE builds may also touch kdeglobals for style. Copy the rc file for behavior restores.
Frequently asked questions
How do I back up KDiff3 settings?
Copy kdiff3rc from the per OS path above. Restore before launch on the new machine. Diff results themselves never persist anywhere.
Where are KDiff3 recent files?
Inside kdiff3rc recent lists. Clearing them needs the settings dialog or hand editing with the app closed.
Notice an outdated path? Let us know.