Convert eBook files (EPUB) online for free
The converter easily converts your EPUB eBooks to various formats - free and online. No Calibre or or other E-Book software needed.
The converter also works in reverse, so you can convert other "Electronic Publication" formats to EPUB without using software like Calibre or a similar tool.
The .EPUB format is the global open standard for electronic books, originally developed by the International Digital Publishing Forum (IDPF) and now maintained by the W3C. Under the hood, an .EPUB is structurally just a ZIP archive containing HTML text, CSS stylesheets, images, and XML metadata. This web-based structure allows the text to reflow dynamically and adapt to various screen sizes and e-reader devices. You can open and manage these files locally using free management software like Calibre or native apps like Apple Books and Adobe Digital Editions.
Despite its widespread use, .EPUB files come with notable disadvantages. Because they rely on CSS, complex formatting like tables or specific fonts often breaks or displays unpredictably on cheaper or older e-readers. Furthermore, many commercial .EPUB files are locked with Adobe DRM (Digital Rights Management), strictly preventing you from reading your purchased book on unauthorized devices. Historically, Amazon Kindle devices refused to open native .EPUB files, creating a frustrating ecosystem gap, and the format is inherently terrible for physical printing because there are no fixed page sizes.
To solve these limitations, conversion is often necessary. To read on an older Kindle via USB transfer, convert to AZW3 or MOBI. For archiving, sharing strict layouts, or printing, convert to PDF. If you need to edit the manuscript, convert to DOCX or TXT. Drag and drop your file here to analyze and convert it - free, online, and without installing software.
Use Convert.Guru to open and convert your EPUB file.
Users also converted KFX, ACSM, ZLIB, RS, XYZ, DRM, AZW3, MOBI, PDF, KPF, LCP, OPF and EDB files.
If you want to convert EPUB file to AZW, KFX, PRC, OPF, CBZ or CBR, you can use Calibre or similar software from the "E-Book Reading and Distribution" category. In the File menu, look for Save As… or Export….
To convert CBT, CBA or DOC files to EPUB, try Calibre or another comparable tool in the "E-Book Reading and Distribution" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our EPUB converter.