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Reset external diff/merge tool (KDiff3) path

I am trying to set up SourceTree to use KDiff3 for the external diff tool and external merge tool.

The first time you set the menus to KDiff3 and hit OK, a dialog appears requiring you to find the location of the KDiff3 executable.

I accidentally used the Start Menu shortcut instead of the actual file, but now I can't figure out how to change the path (the dialog doesn't appear once you've initially set it).

How can I change the file path of the KDiff3.exe?

1 answer

0 votes
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
Feb 27, 2018


If you want to do it in Sourcetree, in the Tools/Options/Diff select a 'Custom' diff and merge tool and select a random .exe then OK the Tools/Options dialog. Then re-open and change it back to KDiff3. 

That should all have the effect of overwriting and then resetting the external diff/merge settings.

Alternatively use the git command line to clear difftool.sourcetree.cmd and mergetool.sourcetree.cmd using

>git config --global --unset difftool.sourcetree.cmd


Then reset in Sourcetree

When you select "Custom" should it show a dialog? Also when you do set it to a different one, all the code in the fields is reset. SHould it show default code there?

I was trying to get Custom working again and decadently changed the first one. THen remembered i had same issue before and need google what code should be in those fields.


Where can i actually apply that command ?

git config --global --unset difftool.sourcetree.cmd

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