ZIP is the generic container for manga pages: whatever you downloaded, exported or packed yourself, if it is a set of page images it can be translated as a single job.
You can select up to 20 ZIP files in one go. They are queued and processed one after another, so a whole volume can be submitted in a single action. Turn on completion emails in Settings if you would rather not keep the tab open.
They are the same container — the extension is a convention used by comic readers. Either one can be uploaded here; if your file ends in .cbz, the CBZ page covers the details.
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2 free pages a day, no sign-up. After that, 1 page = 1 credit.
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