I maintain an almost exhaustive list of text to diagram tools [1]. dbdiagram.io requires login to export.

Other dedicated text to database diagram tools are

1. Database Diagram Tool https://databasediagram.com/app

2. QuickDBD https://app.quickdatabasediagrams.com/#/

3. ERD Lab https://app.erdlab.io/designer/guest (Requires Login to Export)

[1]: https://xosh.org/text-to-diagram/