CBR is a file format commonly used for storing data.
Common Uses
Comic book reading
Manga archives
Digital comics
CBR Conversion FAQ
What is a CBR file?
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CBR (Comic Book RAR) is an archive format for storing digital comic book pages.
What is actually inside a CBR file?
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A folder of page images in reading order, compressed into one archive with a different extension. There is no text layer and no reflow — a comic page is a picture, and the reader's job is simply to show them in sequence. That makes conversion mostly a question of what happens to the images: page size, compression and whether double-page spreads are split. CBR is a Comic Book RAR archive — an ordinary RAR of page images with the extension changed so comic readers pick it up.
Why will some readers not open my CBR?
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Because of the archive inside it. The container in a CBR is a RAR, and RAR is proprietary compression whose decompressor is licensed rather than free to reimplement — so a great many readers, and almost every lightweight mobile app, simply cannot unpack one. Nothing is wrong with the pages; they are ordinary images and they are fine. Repacking exactly those pages into the ZIP-based comic archive makes the file openable by anything that can open an archive at all, without touching a single pixel.
Why are the pages in my CBR different sizes?
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Because each page is an independent image and nothing in the format enforces consistency. Scans made in different sessions, at different resolutions, or with double-page spreads left unsplit all end up in the same archive, and the reader simply scales each one to fit as it arrives. A conversion can normalise them to a common width, which is worth doing before sending the file to a small screen.
Why are the pages of my CBR in the wrong order?
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Because the order is the filenames and nothing else. A CBR carries no page list — the reader sorts the images inside it as text and shows them in that order, which is why `page2` lands after `page10` whenever the numbers are not padded to the same width. Renaming them `001`, `002` and so on fixes it permanently, and it is worth doing before converting rather than after: every format downstream inherits whatever order it was handed. The archive holds one image per page, normally JPG or PNG, read in filename order.
Where does a CBR keep the series and issue number?
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In a small metadata file tucked inside the archive next to the pages, when it has one at all — series, issue, volume, writer and artist live there rather than in the images. Readers that know the convention show it in their library; readers that do not ignore the extra file and show you a filename. It travels intact between comic archive formats, and it has nowhere to go in a format that expects one continuous document, so plan on re-entering it after converting out of a comic archive. CBR is the de facto standard for scanned comics and is understood by every comic reader on every platform.
Can I search the text inside a CBR?
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Not as it stands. The lettering is part of the artwork — pixels rather than characters — so there is nothing for a search to match and nothing to reflow at a larger font size. Optical character recognition can add a text layer over the pages and make them searchable, but the result is a document about the comic rather than a comic, so it is rarely worth it for reading.
Can a CBR be locked with DRM?
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No, because the format has no mechanism for it: no encryption layer, no account binding, no licence server anywhere in it. That is exactly why scanned and self-published comics circulate this way, and why converting one never hits the wall a store-bought ebook does. It is a statement about the container and not about the contents — a comic with no DRM on it can still be somebody else's copyright. RAR is a proprietary compression format, so CBR is harder to open with standard tools than the ZIP-based CBZ.
Is the cover image kept when I convert a CBR?
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It is, provided the book records one as the cover rather than merely having a picture on its first page. That distinction is why a converted book sometimes shows a blank placeholder in a library: the image is still inside the file, but nothing marks it as the cover, so the reader app displays nothing. It is metadata rather than content, and it can be set afterwards without touching the text.
Does it matter that CBR is over thirty years old?
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Age itself is not the problem — several formats from that era are still perfectly good, precisely because everything has had decades to implement them. What matters is what the era assumed: small files, modest processors, no network, and features nobody needed yet. Where those assumptions still fit, the format is fine. Where they do not, that is the reason to convert.
Can I convert a whole folder of CBR files in one go?
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With an account, yes — drop them in together and they are queued as one job rather than handled one at a time, with the same settings applied across the batch and the results returned together. Free conversions run a single file at a time (merge tools take two); a paid plan is what unlocks batch processing and the larger per-file limit, which is what makes converting a whole archive practical.
What happens to my CBR file after the conversion?
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It is deleted. The upload and the converted result both sit on the server only as long as the job needs them and are then removed automatically; the transfer runs over HTTPS in both directions. Nobody reads the contents, nothing is indexed, and nothing is passed to anyone else. If you would rather not wait for the automatic sweep, closing the job removes the files immediately.
