PDF to CBZ

Scale multiplies the page's native size, from 1.0x to 4.0x with 2.0x as the default. 2.0x suits phones and most tablets; 3.0x or 4.0x gives sharper pages on high-resolution screens at the cost of a much larger file and a longer conversion.

Every page is rendered to a bitmap at the chosen scale, which discards the PDF's compact vector text and compression. Lowering the scale, choosing JPEG or WebP at around 80% quality, or turning on grayscale for black-and-white content all bring the size down.

It writes a right-to-left reading direction flag into the ComicInfo.xml metadata so readers that honor the flag page from right to left. The page images themselves are unchanged.

Yes. Images are named with zero-padded numbers, such as 01.jpg or 001.jpg depending on the page count, so readers that sort filenames alphabetically keep the sequence even past page 100.

Calibre reads the metadata.opf file inside the archive: title, author, publisher, year, tags, and series with its index. Komga, Kavita, CDisplayEx, Mylar, and ComicRack use ComicInfo.xml, and a ComicBookInfo record in the ZIP comment covers older readers. Fill in Series and Number so libraries group issues correctly.

No. This tool handles one PDF per run, and adding another file replaces the current one. Convert them one at a time.

If the PDF needs a password to open, you're prompted for it and the pages are rendered from a decrypted copy held in memory.

No. Pages are drawn with PDF.js in your browser and zipped locally, so the comic never leaves your device.