This one's website (and a dead comment replying to you) suggests that processing the PDF in the browser, rather than uploading to a server, is a point of differentiation.
However, there are older tools that do this, such as BentoPDF (which is also open source) [1].
However, there are older tools that do this, such as BentoPDF (which is also open source) [1].
[1]: https://www.bentopdf.com/