Translating EPUB files while maintaining their original display format can be achieved by identifying all text locations, then translating and populating the content into the corresponding positions.

PDF.js is a JavaScript library for rendering and interacting with PDF documents on web pages. While PDF.js is primarily used for displaying PDF documents in browsers, it also provides APIs and functionality for extracting text information from PDFs.

This guide provides detailed instructions on how to properly download and save files (such as PDF or PPTX) using Safari or Chrome browser on iPhone. It addresses the common issue where files open in a preview window rather than prompting for download.