Free online JPEG to CBZ converter

Comic readers and ebook libraries require CBZ when they expect a comic-book archive instead of separate page images. Packaging scanned or exported JPEG pages as CBZ puts the complete comic in one file for reading, sharing, and archiving.

What the JPEG format is

JPEG, commonly identified by .jpg or .jpeg, is a lossy raster-image format used for scanned comic pages, photographs, and exported artwork. Scanners, cameras, comic artists, image editors such as GIMP and Adobe Photoshop, and document-management systems commonly create JPEG files.

A JPEG stores one image and does not contain page order, chapters, bookmarks, or ebook navigation. Its compression discards image data, so repeatedly opening and re-saving a page can reduce quality.

What the CBZ format is

CBZ is a comic-book archive: a standard ZIP archive containing page images, usually JPEG or PNG files, with the filename extension changed from .zip to .cbz. Applications such as CDisplayEx, YACReader, and other comic readers open the archive as a sequence of pages.

CBZ keeps the pages in one portable file and normally does not recompress the images. Numeric filenames such as 001.jpg, 002.jpg, and 003.jpg establish a predictable reading order. CBZ is an image container, not a reflowable ebook format.

How to create a CBZ

Using 101convert.com

You can convert the JPEG pages on 101convert.com for free without installing software. Select or upload the pages, start the JPEG-to-CBZ conversion, and download the resulting archive. For a multi-page comic, use filenames with leading numbers, such as 001.jpg and 002.jpg, or use the converter's available ordering controls.

Creating the archive manually

1. Put every page image in one folder and remove thumbnails, duplicate pages, and unrelated files.
2. Rename the pages with the same number of digits: 001.jpg, 002.jpg, through 010.jpg. Leading zeros prevent lexical sorting from placing 10.jpg before 2.jpg.
3. Create a ZIP archive containing the page files at the archive root. On Windows, select the files, right-click, and choose Send to → Compressed (zipped) folder. On macOS, select them in Finder, Control-click, and choose Compress.
4. Rename the resulting file from comic.zip to comic.cbz. Enable file-extension display if the file manager hides extensions, so the filename does not become comic.cbz.zip.
5. Open the CBZ in a comic reader and check the first, middle, and last pages.

From a folder containing correctly numbered JPEG files, a command-line ZIP utility can create the archive directly:

zip -j comic.cbz 001.jpg 002.jpg 003.jpg

The -j option excludes directory paths, placing the images at the archive root. To include all matching JPEG files, use zip -j comic.cbz *.jpg; verify the archive afterward because shell sorting and mixed filename patterns can produce an unintended order. Include *.jpeg separately if the pages use that extension.

Quality and compatibility limits

Changing ZIP to CBZ does not alter JPEG pixels or restore detail lost during JPEG compression. ZIP normally adds little size to already-compressed JPEGs, and the manual process does not reduce image quality. Keep the original page files if you may need to edit or reprocess the scans.

Use PNG inside the CBZ for line art, text, or flat colors when larger lossless files are acceptable. Most comic readers support JPEG and PNG, but a reader may reject uncommon image formats, encrypted archives, or archives with unusual internal structures.

Keep pages at consistent dimensions and orientation. Avoid nested folders, hidden metadata directories such as __MACOSX, thumbnails, and non-image files; some readers display unsupported files as blank pages.

CBZ does not normally provide selectable text, automatic OCR, reflow, bookmarks, or a built-in table of contents. OCR must be performed separately, and any reader-specific metadata or navigation may not transfer between applications.