Ever wondered why your comic sometimes renders weirdly on your e-readers ? This is most likely because the reader service you are using has a different behavior and probably needs a specific format from your epub.
A common example is an epub that renders fine on Kobo but will have white margin on Google Play Book. Kobo handle manga in a more flexible way than Google Play Book and as a result you might need to fix your epub to apply a strict fixed layour on every pages.
This app will help you fix the common issue you can have with a specific engine.
- Google fixed layout support https://support.google.com/books/partner/answer/3316879?hl=en
- epub3 fixed layout spreadsheet http://idpf.org/epub/fxl/