How do I see the differences between two branches?

Use git diff.

git diff [<options>] <commit>..​<commit> [--] [<path>…​]

<commit> is a branch name, a commit hash, or a shorthand symbolic reference.

Examples: git diff abc123..def567, git diff HEAD..origin/master.

That will produce the diff between the tips of the two branches. If you'd prefer to find the diff from their common ancestor to test, you can use three dots instead of two:

git diff <commit>...<commit>

To check which files differ, not how the content differs, use --name-only:

git diff --name-only <commit>..​<commit>

Note that in the <commit>..<commit> (two dot) syntax, the dots are optional; the following is synonymous:

git diff commit1 commit2

Go to a branch (e.g. main), then run diff against another branch (e.g. branch2):

git checkout main
git diff branch2

git diff master..develop

Options:

• Add --name-only to only see the names of the files.
• Add -- folderOrFileName at the end to see the changes of specific files or folders.
• To compare the local branch with the remote one, then run git fetch --all to fetch all remote branches, and run:

  git diff --name-only [branchName]..origin/[branchName]
  

  Example: git diff --name-only develop..origin/develop.

You can simply show difference by- git diff b1...b2 Or you can show commit difference using- git log b1..b2 You can see commit difference in a nice graphical way using - git log --oneline --graph --decorate --abbrev-commit b1..b2

There are many different ways to compare branches, and it's depend on the specific use case you need.

Many times you want to compare because something broken and you want to see what has been changes, then fix it, and see again what changed before commiting.

Personally when I want to see the diff what I like to do:

git checkout branch_1 # checkout the oldest branch
git checkout -b compare-branch # create a new branch
git merge --no-commit --squash branch_2 # put files from the new branch in the working folder
git status # see file names that changes
git diff # see the content that changed.

Using this solution you will see the diff, you can also see only the file names using git status, and the most important part you will be able to execute branch_2 while seeing the diff (branch_2 is on the working tree). If something had broken you can editing the files and fix it. Anytime, you can type again git status or git diff to see the diff from the new edit to branch_a.

There are two ways to see the differences between two branches.The modifications that have been made to the files in each branch will be shown by these commands.

1. Use the git diff command to view the differences between two branches in a Git repository.

   git diff branch1 branch2 will show all the differences.

   If you wish to compare a specific file between the two branches, you can use this command as:

   git diff branch1 branch2 path/to/file

2. The git log command can also be used to view the differences between two branches. Run the git log command with the —left-right parameter and the two branches you wish to compare like this:

   git log --left-right branch1...branch2

Sometimes it's nice to see the diff as a tree...

git difftool --dir-diff branch..otherBranch

or to compare a remote branch to the local workspace...

git difftool --dir-diff origin/branch .

For example, when bitbucket decides for performance reasons it will only show you a "three way merge" diff rather than the actual complete differences between the two branches you've selected.

This will show the diff as a tree in the tool you've selected. e.g. in meld.

Inspired by @GregRundlett comment.

When on the feature branch, merge your target branch and then run a diff against it. For example, if you want to see what changes your feature branch add to master, do the following:

// Fetch from all remotes
git fetch

// Check out your feature branch
git checkout feature

// Merge origin/master to your branch
git merge origin/master

// Compare to origin/master
git diff origin/master

In Eclipse(J2EE version) , open "Window --> Show view --> Git Repository". if you have checked out 2 local git branches for examples then you will have bunch of branches in Local section. select any 2 git local branches and do " right click and select "Compare with each other in Tree menu".

Open view "Git Tree Compare" and u will be able to see side by side diff for all files.