Description

Quickly and easily compare all files in Git (a commit or Staged/Unstaged files) or TFS (a changeset, shelveset, or files with pending changes) to see what has changed. Instead of clicking on each file individually and choosing to compare it with a different version, just click one button to compare all of the files.

You may edit the extension's settings from the Tools -> Options... -> Diff All Files settings page.

Download this extension for Visual Studio 2012, 2013, or 2015 from the VS Extension Gallery.

Features

Compare files one at a time, many files at a time, or with all files combined in a single file.
Uses the same diff (i.e. compare) tool that you have configured in your .gitconfig (for Git) and Visual Studio (for TFVC). e.g. KDiff, Beyond Compare, Visual Studio, etc.
Exclude comparing files with specific extensions, or files that have been added or deleted from source control.
Button to quickly close all diff tool windows that have been opened.
Specify the file versions to compare against (i.e. Unmodified, Workspace, Previous, Latest).
Supports both Git and TFVC source control providers.

Screen shots

Before comparing files (left) and while comparing files (right):

Diff All Files section before doing a compare Diff All Files section while comparing files

Settings Screen (available in Visual Studio from Tools -> Options... -> Diff All Files):

Diff All Files Settings page