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Comic Book ZIP (CBZ) to EPUB converter

CBZ → EPUB wraps each comic page in its own fixed page, so reading apps that shelve EPUB but ignore CBZ show the comic with a cover in the library.

  • Converted with Image engine · input deleted within 24 h
  • Free: 5 conversions a day · 5 MB each
  • Higher limits →

From real runs

What you get — and what changes

  • Fixed pages Kept

    The EPUB is pre-paginated: every page has a viewport the size of its scan, so a reading app shows whole pages and never reflows them.

  • JPEG and PNG scans Kept

    Scans are stored in the EPUB unchanged; only the file names become p0001.jpg, p0002.png and so on.

  • WebP pages Changed

    WebP pages are saved as JPEG for older reading apps, which is why the mixed test archive grew from 5.36 MB to 5.71 MB as EPUB.

  • Cover and title Kept

    The first page is marked as the cover image for library views, and the title comes from ComicInfo.xml or, failing that, the file name.

  • Right-to-left manga Kept

    When ComicInfo.xml says Manga YesAndRightToLeft, the EPUB is marked right-to-left so page turns go the Japanese way.

  • Text size and reflow Lost

    A scanned page has no text to enlarge or reflow; you zoom the picture as you would a PDF.

  • Table of contents Changed

    The contents list has a single entry pointing at the cover, because a CBZ carries no chapter information.

Sample conversions

Full issue

Input
Terrors of the Jungle #10, a 25,006,136-byte CBZ of 36 JPEG pages.
Output
25,901,124-byte EPUB in 1.05 s; EPUBCheck 5.2.1 reported no errors or warnings.

Mixed test archive

Input
The 12-page Bobby Make-Believe test CBZ with JPEG, PNG and WebP pages and a double-page spread.
Output
5,712,572-byte EPUB in 0.4 s, pages in order, the spread marked to show on its own; no EPUBCheck errors.

A real Comic Book ZIP (CBZ) → EPUB run

We converted our Comic Book ZIP (CBZ) sample (325 KB) with Image engine on 2026-10-20. It took 18 ms and produced a 327 KB EPUB file, about the same size as the input. The engine raised no warnings.

Input · sample.cbz · 325 KB

ZIP with 4 parts

Archive parts
4
first
ComicInfo.xml

Output · sample.epub · 327 KB

EPUB 3.0: 4 content documents, 3 images, EPUB 3 nav, cover set, title “Bobby Make-Believe”

Version
3.0
Content documents
4
Images
3
Table of contents
EPUB 3 nav
Cover
cover set
Title
Bobby Make-Believe

Options and when to change them

quality
Sets the JPEG quality used when WebP pages are converted; other pages are not touched.

Do it yourself

calibre

bash
ebook-convert comic.cbz comic.epub

calibre 6.13 shrank 975 × 1349 scans to 584 × 754, stored them as PNG, added its own title page and skipped WebP pages; check its comic input options before converting a collection.

Comic Book ZIP (CBZ) to EPUB by API or MCP

The HTTP API and the MCP server run the exact engine this page uses (Image engine); the response carries the same warnings the web converter shows. Check support first with GET /api/v1/pairs?from=cbz&to=epub.

curl
curl -X POST https://filetypeconverters.com/api/v1/convert \
  -H "Authorization: Bearer $FTC_API_KEY" \
  -F "file=@input.cbz" -F "from=cbz" -F "to=epub" \
  --output output.epub
API reference

When this is the wrong conversion

  • If your reading app opens CBZ directly, keep the CBZ; the EPUB holds the same pictures.
  • If you read on a Kindle, test one issue first: we checked the EPUB against the EPUB 3 rules, not on Kindle hardware.

Comic Book ZIP (CBZ) to EPUB questions

Will the comic reflow like a novel?

No. Comic pages are pictures, so the EPUB uses fixed layout: one scan per screen, zoomed the way your reading app zooms pages.

Why is the EPUB about the same size as the CBZ?

The page images are stored as they were, and the EPUB adds only small XHTML wrappers. It grows only when WebP pages have to be saved as JPEG.

Which apps can read the result?

Any reading system that supports EPUB 3 fixed layout. Our files pass EPUBCheck with no errors; we have not tried every e-reader, so open one issue before converting a whole series.

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