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Free HTML to EPUB converter. No sign-up — package web pages and saved articles into ebooks you can read offline anywhere.
To convert HTML to EPUB: upload your file using the form below, select EPUB as the output format, and click Convert. Our Calibre-powered engine processes the conversion in seconds with no registration required. The converter preserves text content, chapter structure, images, and metadata. For batch conversions of up to 50 files, upgrade to Pro.
Every HTML to EPUB conversion runs on the Calibre engine — the industry-standard open-source ebook library trusted by readers and tools worldwide. Calibre preserves fonts, chapter structure, and metadata far more faithfully than converters that rebuild files from scratch.
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HTML is the markup that every web page is made of. Headings, paragraphs, lists, tables, images, links — each one is a tag that says what a piece of content is, while CSS handles how it looks.
It is brilliant for the web and mildly awful for long reading. A browser tab has no memory of where you stopped, no font controls worth using, no night mode that respects the page, and no offline guarantee once the site goes down.
HTML also comes in a lot of shapes:
EPUB is the open ebook standard, and it is what nearly every reading device speaks natively — Apple Books, Kobo, Nook, Google Play Books, PocketBook, and Kindle via Send to Kindle.
Under the hood it is a ZIP archive of XHTML, CSS, and images, which is exactly why HTML converts into it so naturally. The difference is everything EPUB wraps around that content:
The two formats share DNA — EPUB is literally a packaged, styled form of HTML — but they are built for different moments. Here is the short version:
| HTML | EPUB | |
|---|---|---|
| Purpose | Display content in a browser | Read content as a book |
| Layout | Fluid or fixed by CSS, bound to a screen | Reflowable, controlled by the reader |
| Reading tools | Browser tabs, no position memory | Bookmarks, highlights, saved reading position |
| Offline use | Depends on the host staying up | Self-contained file that always works |
| Table of contents | None unless you code one | Built automatically from your headings |
| Best for | Browsing the web and reading on a screen | Sitting down to read for a long stretch |
1. Upload your file. Drop in a .html or .htm file. Free accounts cover files up to 10MB, which is far more than any realistic text document needs — that ceiling only matters if your page is stuffed with large images.
2. We parse and restructure. The converter reads your heading hierarchy to work out chapters, pulls the title and author from the document head where they exist, downloads any externally linked images so the book works offline, and rewrites inline styles into EPUB-safe CSS.
3. Download the EPUB. Send it to your reader, email it to your Kindle, or drop it into Apple Books.
Typical conversions finish in five to fifteen seconds. Image-heavy pages can take a minute or two while the linked assets are fetched and repackaged. Converting a set of pages? Pro accounts handle batches and larger uploads.
Reading long articles properly. Save a 12,000-word essay or a multi-part investigative piece, convert it, and read it on e-ink without the ads, popups, and newsletter overlays.
Self-publishing from a web-first draft. Plenty of writers draft in Markdown, export to HTML, and need an EPUB for distribution. This is the last step of that chain.
Turning documentation into a manual. Export your docs site to HTML, bundle it as an EPUB, and hand it to a client or a field team who might not have connectivity.
Archiving your own writing. A blog can vanish overnight when a host shuts down. An EPUB on your own drive does not.
Course and training material. Reflowable text with a working table of contents beats a stack of printed pages or a folder of loose web files.
Handled well:
Yes, and that is the most common case. A single page becomes a single-chapter ebook. For a multi-page site, either merge the pages into one HTML file first or convert section by section.
Yes. Externally linked images are downloaded during conversion and packaged inside the EPUB, so your book keeps working offline even if the original site goes down.
They do not survive as interactive elements. EPUB readers deliberately restrict scripting, so dynamic content is flattened into its static equivalent or removed.
From your heading hierarchy. If your document uses real heading tags in a sensible order, you will get clean chapter navigation. Pages that fake headings with styled text will produce a flat, single-entry TOC.
Most pages finish in five to fifteen seconds. Free accounts accept files up to 10MB; Pro adds batch conversion and larger uploads for image-heavy documents.
Keep HTML if the content only needs to render in a browser. Convert to EPUB when you want it read like a book — on a phone, an e-reader, or offline — because EPUB adds reflow, a real table of contents, and saved reading position that raw HTML pages lack.
Absolutely. All files are transferred over 256-bit TLS (SSL) encrypted connections. Your original file and converted file are automatically deleted from our servers within 1 hour. We never read, store, or share your content.
Deepen your understanding with expert conversion guides:
EPUB 2 and EPUB 3 are the two versions of the open ebook standard. Most readers handle both without you noticing, but they are not the same underneath. EPUB 3 added multimedia, better accessibility, and richer navigation. Here is what changed and whether it matters for your books.
Kobo's own format is already EPUB under the hood (its tuned variant is called KEPUB), so "converting a Kobo book to EPUB" is often simpler than it sounds — or impossible, if the book is store-DRMed. This guide explains both cases and what you can actually do.
If you are an avid reader or self-published author, the biggest hurdle is often format compatibility. The short answer is: **Kindle users should use AZW3**, while **Kobo and other e-readers prefer EPUB**. MOBI is outdated for new devices. Use tools like [bookconv.com](/convert) or Calibre to convert your files instantly. For the head-to-head of the two formats themselves, see our [EPUB vs MOBI comparison](/blog/epub-vs-mobi).
Format explainers and in-depth comparisons:
PDF to EPUB usually means lost images and a wall of text. Here is how to keep the pictures in and make the result actually readable.
Bought a book on Kindle and want it on your phone, Kobo, or computer? AZW3 is Amazon's cage. Converting to EPUB frees it — here is how to keep the layout intact.
You wrote your book in Word, but stores and e-readers want EPUB. A bad conversion gives you one giant paragraph and broken chapters. Here is how to convert cleanly and self-publish.
“BookConv saved me hours of manual work. I convert all my manuscript drafts to EPUB and MOBI in seconds. The quality is perfect — no formatting loss at all.”
Sarah Mitchell
Self-published author
“We use BookConv daily to help our patrons convert old LIT files to modern formats. It's fast, free, and requires no software installation. A must-have tool.”
James Rodriguez
Librarian
“I've tried many converters, but BookConv is the only one that handles FB2 and AZW3 without issues. The batch conversion feature is a game-changer for my workflow.”
Yuki Tanaka
Digital content creator