EPUB Converter
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Supports: EPUB
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Need help?How to Convert an EPUB File
- Upload Your EPUB: Drag your
.epubinto the drop zone or click "Add Files". Add more than one book and they convert in turn, so a shelf can go through in a single pass. - Pick an Output Format: The eBook File Extension selector on this page offers EPUB and MOBI, with MOBI preselected — that is the legacy Kindle format you sideload over USB. There are no quality sliders or page presets to set: an ebook conversion is a document-structure transformation, not an encode.
- Check the File List: Remove anything you added by mistake and confirm you are converting the edition you meant. EPUB files that carry store DRM cannot be converted by any format converter, so it is worth checking that a purchased book is a DRM-free copy before you start.
- Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers with Calibre's
ebook-convertengine, and deleted automatically after a few hours — no sign-up, no email, no watermark, never shared.
Popular EPUB Conversions
- EPUB to MOBI — the legacy Kindle format, for older hardware and offline USB transfers
- EPUB to PDF — a fixed page you can print, annotate or send to someone with no reading app; this target has its own tool page rather than sitting in the selector above
Coming the other way, PDF to EPUB reflows a fixed-layout document into a real ebook, DOCX to EPUB turns a manuscript into one, and MOBI to EPUB modernises an old Kindle-era file. The MOBI converter hub covers that direction in full.
Why Convert an EPUB File?
EPUB is the open ebook standard. It was created by the International Digital Publishing Forum, and since the IDPF merged into the World Wide Web Consortium in 2017 it has been maintained by the W3C — EPUB 3.3 was first published as a W3C Recommendation on 25 May 2023 and has been revised since, most recently in January 2026, with EPUB 3.4 now in development. Structurally an EPUB is a ZIP package: XHTML content documents, CSS, SVG, images, fonts and a package document describing the reading order and metadata, all wrapped in the Open Container Format. That is why its text reflows — the reading app lays out the HTML to fit whatever screen and font size the reader chose.
Being an open, widely implemented standard means EPUB is usually the format you want to keep. People convert away from it for a small number of concrete reasons:
- Older Kindle hardware. Amazon's Send to Kindle service accepts EPUB directly now, but a pre-2022 Kindle you are loading over USB does not — that workflow still wants a
.mobiin the device's Documents folder. - A fixed page instead of a reflowing one. Anything with a layout that must not move — a worksheet, a score, a form, a document going to a print shop — needs PDF, and that trade is the whole point of the conversion.
- Recipients with no reading app. PDF opens in every browser and on every phone with nothing installed. EPUB needs Apple Books, Play Books, Kobo, Calibre or an equivalent, which is one step too many for some audiences.
- Archiving in more than one format. An open standard is a good bet for long-term readability, but keeping a second copy in a different format is cheap insurance against any one ecosystem changing its mind.
EPUB Next to the Formats People Convert It To
| Format | Layout model | Maintained by | Opens natively on | Best for |
|---|---|---|---|---|
| EPUB | Reflowable, with a fixed-layout profile in EPUB 3 | W3C — EPUB 3.3 Recommendation, first published 25 May 2023 | Apple Books, Google Play Books, Kobo, Nook, Calibre, Thorium; Kindle via Send to Kindle | The portable master copy of any ebook |
| MOBI | Reflowable, record-based structure inherited from PalmDOC | Nobody — Amazon retired it from its own tooling | Older Kindle hardware and the Kindle app, by USB sideload | Loading a book onto a pre-2022 Kindle offline |
| AZW3 (KF8) | Reflowable, built on HTML5 and CSS3 | Amazon, proprietary | Kindle devices and apps | Amazon's own replacement for MOBI, inside its ecosystem |
| Fixed page | ISO 32000 | Every browser, phone, desktop and printer | Printing, forms, annotation, exact-layout sharing |
What Carries Across an Ebook Conversion, and What Does Not
An ebook conversion is a structure transformation, not a re-encode: the converter parses the source into an internal document model and writes the target format from it. That means content survives reliably and presentation survives approximately.
| Content | EPUB to MOBI | EPUB to PDF |
|---|---|---|
| Body text and chapter order | Preserved | Preserved |
| Navigation table of contents | Preserved as a linked, clickable TOC | Becomes fixed page references; the ordering is kept |
| Inline and full-page images | Preserved | Preserved, placed onto fixed pages |
| Core metadata (title, author, language) | Preserved | Written into the PDF document properties |
| CSS styling | Approximated — MOBI's layout model is much older and less expressive than EPUB 3's | Rendered to a page, so most styling is honoured |
| Embedded fonts | Not reliable in a legacy MOBI; expect the device's font | Generally embedded in the output |
| Reflow | Kept — MOBI is a reflowable format too | Lost by definition; the page is now fixed |
| Store DRM | Not removed and not converted — a protected file fails | Same |
Frequently Asked Questions
What actually opens an EPUB file?
More things than any other ebook format. On iPhone, iPad and Mac it is Apple Books; on Android and the web, Google Play Books; Kobo and Nook e-readers read it natively; on the desktop, Calibre, Thorium Reader and Adobe Digital Editions all handle it free of charge. Kindle devices accept EPUB through Amazon's Send to Kindle service, which converts it on Amazon's side. Because EPUB is a W3C standard rather than one company's file format, support is broad and has been widening rather than narrowing.
Do I even need to convert an EPUB for a modern Kindle?
Usually not. Amazon added EPUB support to Send to Kindle during 2022 and dropped MOBI from that service at the same time, so emailing or uploading the .epub to your Send to Kindle address is now the supported route — Amazon converts it to its own internal format on receipt. Convert to MOBI when you are dealing with older Kindle hardware, when you want a file you can copy over USB with no internet connection, or when a tool in your workflow specifically asks for .mobi.
Will converting EPUB to PDF lose the reflowable text?
Yes, and that is the trade you are making deliberately. EPUB reflows the text to fit any screen and lets the reader pick font size, margins and theme; PDF freezes the content onto pages at a fixed size, so every copy looks identical everywhere. That is exactly right for printing, annotating or filling in, and exactly wrong for reading a novel on a phone, where a fixed page means pinch-zoom and horizontal scrolling. If comfortable on-screen reading is the goal, keep the EPUB.
Does the conversion keep my chapters, images and table of contents?
Yes for structure, approximately for styling. Chapter breaks, the navigation table of contents, inline images and core metadata like title and author all carry across, because both EPUB and MOBI store a book as structured, HTML-like content and the converter maps one onto the other. Where results vary is heavy CSS: MOBI's layout model predates EPUB 3 by well over a decade, so custom fonts, complex floats and precise spacing may render differently. Plain text-and-image books convert cleanly; heavily designed cookbooks and technical manuals need a look before you ship them.
Why did my purchased EPUB fail to convert?
Almost always DRM. Books bought from a store may carry Adobe or vendor digital rights management, which is an encryption layer around the content; a format converter reads the file, finds encrypted content it is not permitted to decode, and stops. This is not something any converter works around, and it is the intended behaviour. DRM-free EPUBs — from Project Gutenberg, Standard Ebooks, most indie publishers, Humble Bundle, and books you produced yourself — convert normally.
Is MOBI still worth converting to at all?
Only for older hardware and offline workflows, and the window is closing. Amazon has removed MOBI from its own pipeline in stages: Kindle Direct Publishing stopped accepting MOBI uploads for reflowable books on 1 August 2021 and for fixed-layout books on 18 March 2025, and Send to Kindle dropped it during 2022. Existing MOBI files still open on Kindles that predate those changes, and sideloading over USB still works, but nothing new in the Amazon ecosystem consumes MOBI. If your target device supports EPUB, send the EPUB.
Which conversion should I use for a book I want to keep for a long time?
Keep the EPUB as the master and derive everything else from it. EPUB is an open, published, actively maintained W3C standard implemented by many independent readers, which is the profile you want for long-term readability — no single vendor can retire it the way Amazon retired MOBI. A PDF is a reasonable second copy when the layout itself is part of the work. Converting your library into EPUB, rather than out of it, is the safer direction.
What happens to my file after the conversion?
Your EPUB is uploaded over an encrypted connection, converted on our servers, and both the upload and the result are deleted automatically after a few hours. There is no sign-up, no email address required, no watermark on the output, and your book is never shared or made public. There is no fixed per-file cap either — ebooks are small, usually a few megabytes even with a full set of illustrations, so the only real constraint is your upload speed.