Turn a CBR comic into a PDF, one page per image, at full quality - here in this tab, with nothing uploaded.
A CBR is a RAR archive, which most converters handle on their servers. This opens it in your browser and keeps the pages exactly as they are.
No. JPEG pages are copied into the PDF untouched, and each page takes the size of its image.
Some files named .cbr are really zip archives, and some RAR files are password-protected. The first kind opens anyway; the second cannot be read without the password.
No. The file is opened by your browser, in this tab, and the new file is made here too. Nothing is sent to a server, so there is no copy of your book anywhere else.