Editing Tools. E-book (including e-textbook) readers are specializec levices used for displaying texts in electronic form or special applications nstalled on computers, laptops, smartphones, or tablets (Danowski, 2017). Che latest e-readers make it possible to read e-books in several different -book formats (Danowski, 2017). The variety of formats necessitated stan- lardization. ePUB (electronic publication) is a standard file format for e- 00ks. Its latest version, i.e. the HTML5-based ePUB3, is currently the most yopular format of e-books (Garrish, 2011). E-readers provide a convenient iavigation system using hypertext. They allow, e.g., modifying the size ype and colour of fonts, and creating bookmarks. Some programs also have he possibility to edit text, with a built-in editor. Such programs are dividec nto creators and editors (processors). The former enables creating e-books rom previously prepared HTML-files, text files, or multimedia files. Pro- ‘essors support the editing and formatting of e-books, therefore the knowl. dge of HTML language is not required. eCub is a free, simple platform vhich is an example of an e-book creator. Its extended version is Jutol JUTOH, 2018), which additionally enables editing of an e-book preparec rom HTML, docx, odt, or txt files, or developing it completely from scratch ‘igure 1 shows the Jutoh user interface. Figure 2. Editing tools in the Tools bar Figure 4. Calibre’s Toolbar with Edytuj ksiqzke [Edit your book] selected Table 1. Medical students’ expectations regarding e-textbooks