alt Hacker NewsPDF editor is used as a broadly encompassing term. Yes, other tools can edit existing text, but they upload your PDF to their servers, so it's not private if that's something you care about.
There isn't anything off the shelf that enables editing existing text in the browser, but it's something I'll build from scratch. So you'll be able to edit existing PDF text without compromising privacy.
This can if I remember correctly (can't check now), but it's a POC and not a finished product https://github.com/ShizukuIchi/pdf-editor