HTML EPUB Swap

HTML to EPUB

Choose a HTML file

…or drop a HTML file here

.html, .htm, .xhtml

Convert

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FAQ and format details
Why convert HTML to EPUB?

Writers convert HTML to EPUB when a CMS export or static-site chapter should travel on an e-reader. It is also a way to give a client a book-shaped file without InDesign. If your source is Markdown, convert Markdown→HTML first or use Markdown→EPUB; this page assumes you already have markup.

How this conversion runs

The sanitizer drops scripts. If the body contains two or more h1 elements, each h1 starts a new XHTML chapter; otherwise you get a single chapter. The converter writes EPUB 3: mimetype, container.xml, package.opf, nav.xhtml, a small stylesheet, and chapter files in reading order.

Keep in mind for HTML → EPUB

Fixed-layout EPUBs, audio overlays, and DRM are out of scope. Per-page CSS from the original site is replaced by one simple stylesheet. A website with a global nav in every HTML file will look like repeated 'chapters' of menus unless you paste only the article body.

After you have a EPUB file

Open the .epub in Apple Books, Thorium, or Calibre's viewer. Calibre can send it to a Kindle after its own conversion — Amazon does not ingest EPUB on older devices the same way. Edit structure in Sigil if you need a hand-tuned table of contents.

How do I control chapters?

Use h1 headings in the HTML for each chapter title. Subheads should be h2–h6. A single h1 (or none) yields one chapter titled from the document.

Does this make a Kindle file?

No. The output is EPUB 3. Use Calibre or Kindle Previewer if you need AZW3/KFX. Those formats are a later catalog type, not an alias of EPUB.

This pair at a glance
Accepts
.html, .htm, .xhtml
Writes
.epub · application/epub+zip
Read fidelity
exact (HTML → HTML)
Write fidelity
high (HTML → EPUB)
Source size
Plan for files under 7.6 MB

Runs in this browser.

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About HTML and EPUB

Source file

HTML

The web’s native document format: structured markup for headings, paragraphs, lists, tables, links, and media.

HTML is the pivot format for this converter. Incoming files are turned into a sanitized HTML document, and outgoing files are generated from that document. Browsers, email clients, and most rich-text editors already speak it, which is why it is the most flexible interchange point.

Extensions
.html, .htm, .xhtml
MIME types
text/html, application/xhtml+xml
Kind
text · utf-8
Category
markup
Standard
Open format · since 1993
Comfortable size
Up to about 7.6 MB in this browser converter
Read into HTML
exact fidelity · implemented — Identity transform after sanitizing script/style that cannot round-trip into other document types.

What this format can hold

  • headings
  • paragraphs
  • lists
  • tables
  • links
  • images
  • inline formatting
  • semantic structure

Apps that consume HTML

  • Chrome (Google) — opens on Windows, macOS, Linux, Android
  • Firefox (Mozilla) — opens on Windows, macOS, Linux, Android
  • Safari (Apple) — opens on macOS, iOS
  • Edge (Microsoft) — opens on Windows, macOS
  • VS Code (Microsoft) — creates on Windows, macOS, Linux
  • WordPress — creates and opens on Web

Catalog notes

  • Scripts, event handlers, and external stylesheets are stripped during conversion so the hub stays a document, not an app.
  • XHTML is accepted as input and emitted as HTML5.

Destination file

EPUB

The open ebook format: a ZIP of XHTML chapters, CSS, and a package manifest. What Apple Books, Google Play Books, and most non-Kindle readers consume.

EPUB 3 is HTML in a spine. That makes the HTML hub almost native: we concatenate or split XHTML documents and rewrite the OPF package. Kindle’s AZW/MOBI family is a different type and is not in this matrix.

Extensions
.epub
MIME types
application/epub+zip
Kind
zip · binary
Category
ebook
Standard
Open format · since 2007
Comfortable size
Up to about 38 MB in this browser converter
Written from HTML
high fidelity · implemented — Emits EPUB 3 with a single content document split on h1, plus nav.xhtml.

What this format can hold

  • headings
  • paragraphs
  • lists
  • links
  • images
  • inline formatting
  • chapters
  • table of contents

Usually dropped on the way out

  • multi file chapter map unless h1 split

Apps that consume EPUB

  • Apple Books (Apple) — opens on macOS, iOS
  • Google Play Books (Google) — opens on Web, Android, iOS
  • Calibre — creates and opens on Windows, macOS, Linux
  • Thorium Reader — opens on Windows, macOS, Linux
  • Foliate — opens on Linux
  • Kindle (via conversion) (Amazon) — opens on e-ink, iOS, Android
  • Sigil — creates on Windows, macOS, Linux

Catalog notes

  • DRM-encumbered EPUBs are rejected.
  • Kindle AZW3/MOBI is a later type, not an alias of EPUB.
Other conversions

Other conversions from HTML: MarkdownWordRTFOpenDocumentPDF

Other ways to get EPUB: MarkdownWordRTFOpenDocumentPDF