debian-mirror-gitlab/doc/user/project/merge_requests/squash_and_merge.md

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# Squash and merge **(FREE)**

As you work on a feature branch, you often create small, self-contained commits. These small commits
help describe the process of building a feature, but can clutter your Git history after the feature
is finished. As you finish features, you can combine these commits and ensure a cleaner merge history
in your Git repository by using the _squash and merge_ strategy.

- Small commits are joined together, making it simpler to [revert all parts of a change](revert_changes.md).
- When the single commit merges into the target branch, it retains the full commit history.
- Your base branch remains clean, and contains meaningful commit messages.

Each time a branch merges into your base branch, up to two commits are added:

- The single commit created by squashing the commits from the branch.
- A merge commit, unless you have enabled [fast-forward merges](methods/index.md#fast-forward-merge)
  in your project. Fast-forward merges disable merge commits.

By default, squashed commits contain the following metadata:

- Message: Description of the squash commit, or a customized message
- Author: User that created the merge request
- Committer: User who initiated the squash

Project owners can [create new default messages](commit_templates.md) for all
squash commits and merge commits.

## Set default squash options for a merge request

Users with permission to create or edit a merge request can set the default squash options
for a merge request.

Prerequisites:

- Your project must be [configured](#configure-squash-options-for-a-project) to allow or
  encourage squashing.

To do this:

1. Go to the merge request and select **Edit**.
1. Select or clear the **Squash commits when merge request is accepted** checkbox.
1. Select **Save changes**.

## Squash commits in a merge request

If your project allows you to select squashing options for merge requests, to
squash the commits as part of the merge process:

1. Go to the merge request, and scroll to the merge request reports section that
   contains the **Merge** button.
1. Ensure the **Squash commits** checkbox is selected. This checkbox doesn't display
   if the project's squashing option is set to either **Do not allow** or **Require**.
1. Optional. To modify either the squash commit message or the merge commit message
   (depending on your project configuration), select **Modify commit messages**.
1. When the merge request is ready to merge, select **Merge**.

## Configure squash options for a project

> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/17613) in GitLab 13.2 [with a flag](../../../administration/feature_flags.md) named `squash_options`, disabled by default.
> - [Enabled on GitLab.com and self-managed by default](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39382) in GitLab 13.3.
> - [Generally available](https://gitlab.com/gitlab-org/gitlab/-/issues/232536) in GitLab 13.8. Feature flag `squash_options` removed.

Prerequisites:

- You must have at least the Maintainer role for this project.

To configure the default squashing behavior for all merge requests in your project:

1. On the top bar, select **Main menu > Projects** and find your project.
1. On the left sidebar, select **Settings > Merge requests**.
1. In the **Squash commits when merging** section, select your desired behavior:
   - **Do not allow**: Squashing is never performed, and the option is not displayed.
   - **Allow**: Squashing is allowed, but cleared by default.
   - **Encourage**: Squashing is allowed and selected by default, but can be disabled.
   - **Require**: Squashing is always performed. While merge requests display the option
     to squash, users cannot change it.
1. Select **Save changes**.

## Related topics

- [Commit message templates](commit_templates.md)
- [Merge methods](methods/index.md)

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