This online tool allows users to extract the contents of Android AAR files, which are a package format used to distribute Android libraries. AAR files contain compiled code, resources, and manifest files for an Android library, and can be used to distribute and reuse code across different Android projects. With this tool, users can upload an AAR file and extract its contents, including Java class files, resource files, and the Android manifest, into a directory structure. The tool can be accessed from any web browser and supports real-time extraction of AAR files.