# Comparing to an API baseline

Any API tooling enabled project in your workspace can be compared to any one of the API baselines set up in your workspace. In addition to selecting projects to compare to a baseline you can also select (or multi-select) any of the following within an API tools enabled project:

- source folders
- package fragments
- compilation units

NOTE: all selections must be made from the Package Explorer because the compare wizard works only for Java elements.

To compare to an API baseline do the following:

1. Select the elements to compare using the criteria mentioned above.
2. Select the API baseline to compare to in the Compare Wizard
3. Click Finish and you are all set. Any results from the compare will be shown in the API Tooling view.

Setting up a baseline

API Baselines Preferences
API Baseline Wizard
Missing API Baseline Quickfix