Convert Documents to EPUB Online — Free eBook Converter
Convert your documents and eBooks to EPUB format directly in your browser — no software to install, no account needed. Upload a file and download a ready-to-read EPUB compatible with virtually every modern eReader and reading app.
What is EPUB?
EPUB (Electronic Publication) is the open, standardized eBook format maintained by the World Wide Web Consortium (W3C) and the IDPF. Unlike fixed-layout formats such as PDF, EPUB uses reflowable text, meaning the content automatically adapts to the screen size, font preference, and orientation of the device. An EPUB file is essentially a ZIP archive containing HTML, CSS, images, and metadata — making it lightweight, portable, and widely supported.
EPUB 3, the current major version, adds support for multimedia, scripted interactivity, and improved accessibility features such as semantic markup for assistive technologies.
Why convert to EPUB?
EPUB is the default format for most eReaders and reading apps outside of the Amazon ecosystem, making it the most universal choice for distributing digital books and documents:
- Wide device support: natively supported on Kobo, Apple Books, Google Play Books, Nook, and virtually every non-Kindle eReader.
- Reflowable layout: text reflows to fit any screen or font size, delivering a comfortable reading experience on phones, tablets, and dedicated eReaders alike.
- Smaller file sizes: compared to PDF, EPUB files are typically much smaller, saving storage and reducing download times.
- Accessibility: EPUB supports screen readers, adjustable fonts, high-contrast modes, and other accessibility features that PDFs often lack.
- Open standard: no proprietary lock-in — EPUB files can be opened, edited, and redistributed freely.
Supported input formats
This converter accepts a broad range of document and eBook formats as input, including PDF, DOCX, DOC, ODT, RTF, TXT, HTML, MOBI, AZW3, FB2, LIT, LRF, PDB, PML and more. If you need to convert an existing eBook from one format to EPUB, or turn a word-processor document into a portable eBook, simply upload your file and the converter handles the rest.
Frequently asked questions
Is this EPUB converter free to use?
Yes, the converter is completely free. You can convert documents to EPUB without paying anything or creating an account. Optionally, you can log in to receive an email notification when your conversion is done.
What happens to my uploaded file after conversion?
Your file is processed on the server solely to perform the conversion and is deleted automatically afterwards. It is not stored, shared, or used for any other purpose.
Which eReaders and apps can open EPUB files?
EPUB is supported by Kobo, Apple Books, Google Play Books, Nook, and the majority of Android and iOS reading apps. Amazon Kindle requires a conversion step (e.g. to MOBI or AZW3) to open EPUB files natively.
Will the formatting of my original document be preserved?
Basic formatting such as headings, paragraphs, bold, and italic text is generally carried over. Complex layouts, custom fonts, or advanced PDF formatting may be simplified during conversion because EPUB uses reflowable text rather than fixed pages.
Can I convert an EPUB back to PDF or another document format?
Yes. Use the dedicated PDF, DOCX, or other document converters on this site to convert an EPUB file back to a different format. Each converter accepts a range of eBook and document inputs.