8 formats supported
- EPUB
- MOBI
- Kindle (AZW3)
- FictionBook (FB2)
- Microsoft Reader (LIT)
- Palm Database (PDB)
- HTMLZ
- Plain text
E-book Converter
Convert between EPUB, MOBI, AZW3 and more, with metadata and table-of-contents control.
About this converter
E-books pack text, styles and sometimes images into a single file. EPUB is the open standard built on web technologies, MOBI and AZW3 are Kindle formats, FB2 is a common Russian-language format, and HTMLZ and plain text are simple reading or archiving shapes. People bring store purchases, public-domain downloads, manuscripts and converted web pages, and the reader they use decides which format will open.
The converter reads the formats below and writes the e-book format you choose. It rebuilds the book's structure, so chapters and a table of contents survive into the new container. DRM-protected purchases cannot be opened without the key, and this tool never removes protection.
How it works
Choose an output format
Pick the format you want the result in before you add anything. Every file in the queue is converted to that one format, so the choice shapes the whole run.
Add your files
Drop files onto the page or use the file picker. Each file is checked against the formats this tool accepts, and anything that does not match is reported by name.
Download the result
When a conversion finishes, download the converted file. Uploads and results are deleted after 2 hours, so keep your own copy.
Formats you can convert
The e-book catalog covers the formats of dedicated readers, phone apps and plain-text archives. Every format below is recognised on upload, and the target you choose decides how the book and its chapters are stored.
- EPUB — the open standard read by most e-readers and apps
- MOBI — Amazon's older Kindle format, often DRM-protected
- Kindle (AZW3) — the newer Kindle format, also called KF8
- FictionBook (FB2) — an XML-based e-book format common in Russian libraries
- Microsoft Reader (LIT) — Microsoft Reader books, read here but not produced
- Palm Database (PDB) — Palm database e-books from older handheld readers
- HTMLZ — a zipped HTML bundle for reading or archiving
- Plain text — plain text with no styles or chapters
Quality and what changes
E-book conversion rebuilds the structure rather than copying bytes. Text, chapter breaks and a table of contents are carried into the new format, while styling depends on what the target supports: plain text keeps none of it, EPUB and AZW3 keep most. Images are retained where the target can embed them. DRM protection, when present, prevents a book from being opened at all, so a protected purchase cannot be converted.
Privacy and limits
Guests can convert files up to 100 megabytes and run 5 conversions per day. A free account raises the limit to 500 megabytes and 25 conversions per day, and paid plans go up to 100 gigabytes.
Files you upload and the results you download are kept only long enough for you to collect them and are deleted after 2 hours. After that window nothing of yours remains on the server.
You do not need an account to convert a file; signing in only raises the size and daily limits.
Questions and answers
Which e-book format should I choose?
Choose EPUB for most readers and apps, AZW3 or MOBI for Kindle devices, and plain text when only the words matter. HTMLZ is useful for inspecting or archiving the HTML inside a book.
Will the table of contents survive?
When the source carries chapter structure, the converter rebuilds it for the target. Formats with no chapter model, such as plain text, receive the text without navigation, while EPUB and AZW3 keep a usable table of contents.
Can you convert a DRM-protected book?
No. Protected books cannot be opened without the key, and this tool never removes DRM. Only unprotected files can be converted, whichever format they arrive in.
Are images kept during conversion?
Images are carried over when the target format can embed them. Plain text cannot, so pictures are dropped there, while EPUB, AZW3 and HTMLZ keep the images that the source contains.