FileopiaConvert AZW3 to EPUB
Convert AZW3 to EPUB free in your browser – chapters, images, cover and metadata kept. Batch convert, no upload, no Calibre needed.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: AZW3 to EPUB Converter
- Select one or more AZW3 files.
- No settings needed – the EPUB is built automatically.
- Click Start and download your EPUB.
AZW3 is Kindle Format 8 (KF8) – Amazon’s modern HTML5/CSS3 Kindle format, also produced by Calibre and Gutenberg. EPUB is the open e-book standard read by Apple Books, Kobo, Google Play Books, Thorium and almost every reader app. Fileopia converts between them locally – no software, no account, no upload.
Common uses
- Read AZW3 books on Kobo, Apple Books or Google Play Books.
- Move a library between reading apps.
- Archive DRM-free books in an open format.
- Prepare classics from Project Gutenberg for school.
Tips for best results
- Check the title and author in the result info line after conversion.
- Send the EPUB to Kindle via Send-to-Kindle – Amazon accepts EPUB.
- Convert a whole folder at once.
How it works
The MOBI/AZW3 container (a Palm database) is read record by record: the PalmDOC-compressed text is decompressed, trailing entries stripped, the EXTH metadata read and images matched to their records. A valid EPUB 3 (with EPUB 2 NCX for older readers) is assembled with JSZip.
Compared with other converters
Online e-book converters (CloudConvert, Convertio, Zamzar, online-convert) upload your book and cap free use per day or by size. Calibre is excellent but a 150 MB install. Fileopia runs instantly in a tab and keeps your library private.
Why use Fileopia for AZW3 to EPUB Converter?
| Fileopia | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Your files never leave your device
AZW3 to EPUB Converter runs entirely in your browser using JavaScript and WebAssembly. Your files are read from your disk into this tab, processed in memory and saved straight back to your downloads folder – they are never uploaded to Fileopia or any third party.
- Test it yourself: once this page has loaded, switch off Wi‑Fi or mobile data and run the tool – it keeps working.
- Check the network: open your browser’s developer tools (F12 → Network) while processing; you will see no file upload requests.
- Nothing to delete: close the tab and the data is gone – there is no server copy, no retention period and no account.
Frequently asked questions
How do I convert AZW3 to EPUB without Calibre?
Drop the file here and press Start. Fileopia parses the AZW3 in your browser and builds a standards-compliant EPUB.
Are my books uploaded?
No – everything happens on your device.
What is preserved?
Chapters (split on page breaks / KF8 parts), headings, paragraphs, italics/bold, images, cover, title, author and language.
What can’t be converted?
DRM-protected books bought from the Kindle store, and store books using HUFF/CDIC compression, cannot be converted – that is a legal and technical limit, and you will see a clear message. DRM-free files from Project Gutenberg, Calibre, KindleGen and Standard Ebooks work.
Does it handle Cyrillic and other scripts?
Yes – text is decoded to Unicode and fonts are chosen per script, so Russian, Ukrainian, Greek, Arabic, Hebrew, Chinese and Indic text display correctly.
Can I batch convert?
Yes – select many files and get a ZIP.
Is it legal?
Converting DRM-free books you own for personal use is fine in most countries; removing DRM is not offered.
Does it work offline?
Yes, after the page has loaded once.
Is AZW3 to EPUB Converter really free?
Yes. Every tool on Fileopia is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Fileopia processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. Fileopia works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.