Frequently asked questions

Why is there no read aloud nor annotations for PDFs?

EDRLab considers that EPUB 3 is a far better ebook format than PDF, and therefore prioritises its work on offering a great experience to EPUB users. In Thorium Reader, advanced features like TTS and annotations are consequently available for EPUB first, and we expect that other app developers will get the best from PDF files. It does not mean that advanced features will never be available on PDF in Thorium, simply that our limited budget is used for what we consider best for ebook readers.

I can't select the adequate voice for read aloud function (TTS)

Thorium uses the voices from the computer's operating system, in combination with the language information provided by the book.

• If you are using windows you can follow Microsoft’s guide Download the language pack for voice.
• If you are using Mac OSX the guide Change the voice that the Mac uses to pronounce text.

Once the required voice is installed, Thorium will choose the voice corresponding to the language of the book.

It may happen that the book has the wrong language. In this case, Thorium allows you to change the voice to one that is present in the system via the Voice menu