About EPUB Converter

EPUB Converter is a free, privacy-first tool that converts documents to EPUB format entirely in your browser. No files are uploaded—everything runs locally using JavaScript and WebAssembly.

Why we built this

Most online converters require uploading your files to a server. We wanted a tool that respects your privacy by default—your documents never leave your device.

How it works

When you drop a file, the converter parses it in your browser, extracts text and structure, and packages the result as a valid EPUB3 file. For PDFs, a WebAssembly-based text extraction engine runs entirely client-side.

Supported formats

PDF, DOCX, Markdown, TXT, and HTML can be converted to EPUB. Each format has different strengths—DOCX preserves headings best, while PDF conversion quality depends on the source structure.

Open and transparent

This tool is built with Next.js and TypeScript. The conversion logic is open for inspection. We don’t track users, don’t store files, and don’t require accounts.

Contact

Questions or feedback? Reach us at contact@book-format.vercel.app.