You can import a batch of bookmarks at once (instead of adding each bookmark individually). This might be relevant to include bookmarks from existing collections, e.g. from another bookmarking service or from your browser bookmarks. In the following, we list services with short instructions how to import bookmarks from them.
You can export your bookmarks in your webbrowser into an HTML file and then import this HTML file into BibSonomy. For instructions, visit this page.