Is here any GUI tool that can show file with conflicts side-by-side?

Question

I have a couple of conflicted files and I don't have access to source branches (these files are detached from the repository. There isn't any .git folder and I don't have original versions). There are some conflicts marked by git-merge:

<<<<<<< HEAD
    sizeof(.......bla bla
||||||| merged common ancestors
    sizeof(.......ble ble
=======
    sizeof(.......blu blu
>>>>>>> refs/heads/TAGNAME

Is there a way to see such file in human-readable mode, i.e. parse a single file with marked conflicts and split it to a side-by-side view? I suppose Meld cannot do it, and KDiff3 seems to be unable to do the trick too.

git merge (tool) says that this isn't a Git repository.

git diff --no-index requires two parameters (two files to compare), and as mentioned before I don't have the input files.

Answer 1

Use P4Merge to visualize the differences. You can set it up as the default tool used by Git-Diff and Git-Merge. Here is the effect.

Answer 2

Meld can indeed handle visualising conflicts

Source: Resolving merge conflicts