EPUB to FB2 Converter
Convert EPUB e-books to FB2 in your browser. FB2 is ideal when you need catalogs and readers that prefer FictionBook over EPUB, while EPUB is better known for reflowable reading on phones, tablets, and e-readers.
- Files never uploaded
- Instant, on-device
- Free & no sign-up
Drop EPUB files here, or browse
EPUBFB2 · files stay on your device
up to 30 MB per file · up to 20 files per batch
How to convert EPUB to FB2
- Step 01
Add your EPUB file
Drop one or many EPUB files onto the converter, or browse from disk. Stay within the on-device size limits shown under the drop zone — oversized files are rejected so your tab does not freeze.
- Step 02
Convert the book
Reflow EPUB into FB2 entirely in this tab — useful for personal libraries and manuscripts you would not upload.
- Step 03
Download FB2
Download your new FB2 file immediately. Multiple outputs pack into a single ZIP archive.
Why convert EPUB to FB2
EPUB (e-book format) works well when books and long-form reading across devices. FB2 is the better destination when you need simple XML structure popular with many offline readers. This EPUB to FB2 tool keeps manuscripts and personal libraries on-device while you reflow them for readers, print, or the web.
When to use this tool
- A tool, form, or teammate asked for FB2, but you only have EPUB.
- You are optimizing for catalogs and readers that prefer FictionBook over EPUB instead of staying in EPUB.
- You are moving a book between readers, print, and web formats — FB2 fits the next step better than EPUB.
Good to know
- Output characteristics follow FB2: simple XML structure popular with many offline readers.
- Source quirks still apply — EPUB is limited by not ideal when you need fixed print layout, and conversion cannot invent missing data.
- Reflowable books may paginate differently after conversion; DRM-protected store books cannot be converted.
- Browser limit: about 30 MB per book, up to 20 files per batch, with very long texts capped around 500,000 characters.
- Need a bigger file? For large manuscripts or publisher packages, use Calibre, Sigil, or your word processor’s export, then convert a trimmed personal copy here if needed.
File size limits for EPUB to FB2
Browser limit: about 30 MB per book, up to 20 files per batch, with very long texts capped around 500,000 characters.
Why there is a limit
Ebooks are unpacked and reflowed in memory. Massive manuscripts can stall PDF generation, so size and length caps keep conversions private and responsive.
If your file is too large
For large manuscripts or publisher packages, use Calibre, Sigil, or your word processor’s export, then convert a trimmed personal copy here if needed.
EPUB to FB2 FAQ
Common questions about converting EPUB files to FB2.
Is this EPUB to FB2 converter free?
Yes. Browser Convert does not charge for EPUB → FB2, add watermarks, or require an account.
Does EPUB to FB2 keep chapters and images?
Text flow is preserved as faithfully as the formats allow. Complex layout, scripts, and some media may simplify depending on FB2.
Can I convert DRM-protected books from EPUB to FB2?
No. Store DRM must be removed only through legitimate means. Browser Convert converts unprotected personal files locally.
Is EPUB to FB2 conversion private on Browser Convert?
Yes. Your EPUB e-book is processed in the browser. We do not upload the file to convert it, which is the main difference from typical online converters.
Are there file size limits for EPUB to FB2?
Yes. Browser Convert accepts about 30 MB per file, with up to 20 files queued at once. Ebooks are unpacked and reflowed in memory. Massive manuscripts can stall PDF generation, so size and length caps keep conversions private and responsive. If your file is larger, For large manuscripts or publisher packages, use Calibre, Sigil, or your word processor’s export, then convert a trimmed personal copy here if needed.
Can I convert several EPUB files to FB2 at once?
Yes. Queue up to 20 EPUB files and convert them in one pass. When finished, download the batch as a ZIP. Very large batches may need to be split so your browser stays responsive.