Preparation of ebook from word processor or text files. Best-practice formatting of common book elements. Produced ebooks have been successfully published on Kindle KDP, Apple iTunes, B&N Nook, and other ebooksellers. Files are validated (epubcheck) for EPUB2 (or 3) HTML4 (or 5), and CSS compliance. Files may also optionally be tested for matching quotes, brackets, and parentheses as well as other mechanically-detectable problems. Corrections / changes are not made to the files unless author- or publisher-approved.