Superdense support both
HTML for exporting bookmarks. The HTML format is compatible with browser bookmarks and can be imported into your favorite browser if you want to.
How to export bookmarks
First, select Menu > Settings in the top right dropdown menu.
In settings, select the Data tab.
Here you see options for Import and Export bookmarks.
To export, select the desired format - HTML or CSV - and click "Export".
A download file is generated and saved by your browser. It contains the link, the title (if any), and the name of the category it is linked to.
That's it! 🎉