Free online ebook converter
Upload an ebook and convert among EPUB, MOBI, AZW3, PDF, and more.
About this converter
Readers expect different formats: Kindle uses AZW3/MOBI, most others use EPUB, and PDF is common for print. Conversion runs on the server via Calibre.
Max 50MB per file. Each conversion costs 1 free quota use. DRM-protected files cannot be converted.
Where is the EPUB format defined?
EPUB is a distribution and interchange format for digital publications. The current W3C Recommendation is EPUB 3.3. Kindle commonly uses AZW3 or MOBI, and other readers usually use EPUB. Whether a converted file opens depends on that spec and the target reader.
“EPUB® 3 defines a distribution and interchange format for digital publications and documents.”
FAQ
Is it free?
Yes. Tools share a daily quota; each conversion costs 1 use. Upload and download do not cost extra.
Which formats are supported?
EPUB, MOBI, AZW3, AZW, PDF, FB2, TXT, DOCX, HTML, RTF. DRM-protected Kindle purchases are not supported.
How long does it take?
Plain EPUB is usually under a minute. Large PDFs may take several minutes — keep the page open.
Ebook conversion guides
How to choose a format, and how PDF and Word convert.
AZW to EPUB: not the same file as AZW3 or KFX
AZW is an older Kindle package, not AZW3 and not KFX. Which AZW files can become EPUB, why store books fail, and the online steps.
AZW3 to EPUB: read it after you leave Kindle
Convert a personal AZW3 document to EPUB for Apple Books, Kobo, and other readers. Store books with DRM cannot be converted. Steps and what to check in the contents.
Word to EPUB and TXT to EPUB: how to get a table of contents
How DOCX headings become an EPUB table of contents, what plain TXT cannot do, and why you should not export a complex PDF first.
EPUB vs MOBI vs AZW3: which format to convert to
How EPUB, MOBI, and AZW3 differ, when to convert to each, and what an online conversion keeps or drops.
EPUB to AZW3: copy it onto a Kindle over USB
Convert EPUB to AZW3 when you sideload onto a newer Kindle with a cable. Send to Kindle does not need this: send the EPUB. What the contents keep, and the online steps.
EPUB to MOBI: only for an old Kindle
Convert EPUB to MOBI only for a very old Kindle over USB. Newer devices should get EPUB via Send to Kindle, or AZW3 over USB. What styling you lose, and the online steps.
EPUB to PDF: when to freeze the layout
EPUB to PDF turns a reflowable ebook into fixed pages for print and sharing. You cannot set paper size on this page. When not to convert, and the online steps.
EPUB to TXT: keep the words, drop the layout
EPUB to TXT removes images, the table of contents, and styling, and leaves plain text you can copy. When DOCX is the better export, and the online steps.
FB2 to EPUB: turn FictionBook into a general ebook
Convert FB2 to EPUB for readers that do not open FictionBook. Why this XML ebook converts more cleanly than PDF, what happens to images, and the online steps.
HTML to EPUB: turn one web page into an ebook
HTML to EPUB converts the single HTML file you upload. Images and CSS referenced by relative path are not included. How to keep pictures, and the online steps.
What to send to Kindle: EPUB, AZW3, or MOBI
Send to Kindle wants EPUB. A USB copy wants AZW3. MOBI is no longer accepted by Send to Kindle.
MOBI to EPUB: move an old Kindle file to another reader
Convert MOBI to EPUB for Apple Books, Kobo, and most phone readers. Why an old MOBI table of contents stays flat, and the online steps.
PDF to EPUB: when the layout breaks
What happens to text when a PDF becomes EPUB, why scanned PDFs stay unsearchable, and when you should keep the PDF.
PDF to MOBI: what breaks, and whether to bother
PDF to MOBI reflows a fixed page and then packs it into an old Kindle format. Scans stay unsearchable. Newer Kindles should not target MOBI. Online steps.