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.

AI agents can help with reading, summarizing, and reviewing PDFs, but high-fidelity PDF translation requires layout parsing, OCR, reconstruction, and predictable delivery workflows.