Clicky: https://readerview.app

It looks like it doesn't preserve bold face in the titles. Does it use the default <h2> or <h3> format?

Does it support accented characters like á, ñ, ¿?

Does it support weird encoding? IIRC if you compile a LaTeX file without OT1 the fonts don't use the ascii number, but a numeration that is off by one. [I got a few weird documents, when a reset at the wrong time confused my printer.]