Is my HTML uploaded to any server?

No. The entire conversion runs inside your browser using JSZip. Your markup never leaves your device.

Which EPUB version does this produce?

The tool generates a valid EPUB 3 file with an OPF package document, a navigation document (nav.xhtml), and your HTML wrapped in a standards-compliant XHTML content document.

Can I include CSS styles in my HTML?

Yes. Any blocks or inline style attributes in your pasted HTML are preserved inside the XHTML content document. External stylesheets linked via will not load in an offline EPUB, so inline your critical styles.

Will the EPUB work on Kindle?

Modern Kindles (via Send to Kindle or USB) accept EPUB 3. Older hardware may need a Calibre conversion to MOBI/AZW3.

Is there a size limit?

There is no server-side limit. Very large HTML documents (several MB) may take a moment to process depending on your device.

What if my HTML has invalid markup?

The tool wraps your HTML inside a valid XHTML envelope. Browsers tolerate sloppy HTML, but strict EPUB validators may flag unclosed tags. Clean, well-formed HTML produces the best results.

HTML to EPUB Converter

Paste HTML markup, set a title and author, and download a valid EPUB 3 e-book — assembled entirely in your browser with no upload required.

Book Metadata

Title

Author

Load from File Load .html File

HTML Input

0 characters

EPUB downloaded!

Summary

This tool takes any HTML markup — pasted directly or typed into the editor — and assembles a fully valid EPUB 3 e-book in your browser using JSZip. Set the book title and author, then click Build EPUB to package your HTML content into a standards-compliant .epub file with a navigation document and OPF package. The file downloads immediately without any server upload or account required.

How it works

Paste your HTML markup into the editor, or type it directly.
Enter a book title and author name in the metadata fields.
Click "Build EPUB" — JSZip assembles the EPUB 3 container entirely in your browser.
The .epub file downloads automatically, ready for any e-reader or Calibre.

Use cases

Package a styled HTML article or blog post as a portable e-book.
Turn an HTML documentation page into an offline-readable EPUB.
Convert web-scraped HTML content into e-reader format for offline reading.
Prepare richly formatted HTML manuscripts for EPUB distribution.
Archive HTML-formatted reports or wikis as self-contained e-books.
Test EPUB rendering of custom HTML layouts on Kindle or Kobo.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu