Most manuscripts are written in a word processor and most print files are PDFs, and the trip between the two is where formatting goes wrong. This converter handles that step and tells you honestly what survives it.
Text, paragraph structure, headings, lists, tables and embedded images carry across. What does not carry perfectly is anything that depends on how your word processor resolved a layout at the moment you looked at it: floating text boxes, some field codes, and fonts that are installed on your machine but not embedded in the document.
Conversion is a format change, not a typesetting pass. A document that was never laid out for a book trim size will come out as a correctly converted file that is still the wrong shape for print.
Structural formatting does: paragraphs, headings, lists, most tables and embedded images. Layout that depends on your word processor rendering it a particular way, such as floating text boxes or unembedded fonts, may shift.
No. Conversion changes the format; it does not set the page size, margins or bleed a print interior needs. Take the converted file through a formatter and a validator before uploading.
Complex tables, merged cells and nested tables rely on layout behaviour that differs between formats. Simplifying the table in the source document before converting is usually faster than repairing it afterwards.