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You would typically create a PDF if you wanted to ensure document fidelity, to make it more secure, or to create a copy for storage. Creating a PDF can involve compressing a file, making it take up less storage space. They can be viewed on almost all devices. PDF files aren’t typically created from scratch, but are usually converted, saved or ‘printed’ from other documents or images before sharing, publishing online or storing. It is maintained by the International Organisation for Standardization (ISO). The PDF format is now a standard open format that isn’t just available under Adobe Acrobat.

The format has evolved to allow for editing and interactive elements like electronic signatures or buttons. It was developed by Adobe so people could share documents regardless of which device, operating system, or software they were using, while preserving the content and formatting. PDF stands for ‘Portable Document Format’ file. EPUB also has the potential to include interactivity, accessible image, video, or audio elements. EPUB files normally include an index page for navigation, and accessibility features to adjust text size or allow for text-to-speech. The EPUB format comprises three open standards – one defining content markup, one describing the ebook structure, and one packaging all the files into a compressed format. The EPUB standard is now maintained by a World Wide Web Consortium (W3C) working group. Amazon announced in 2022 that new Kindle models would also support EPUB files. EPUB files can be viewed on a wide range of e-readers and digital reading apps, including NOOK, Apple Books, Okular and Calibre. The format was developed in the mid-late 2000s by the International Digital Publishing Forum and is an alternative to formats like AZW, developed for the Kindle. EPUB is short for ‘electronic publication’. EPUB is the standard open-source format for ebooks.

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