What is the CBR file format?
.cbr is a file format used for storing and viewing sequential images, typically comic books. A .cbr file is a standard RAR archive that has been renamed with the .cbr extension - there is no structural difference between a .cbr and a .rar file. The format was popularized around 2003 by the CDisplay comic reader, and the convention spread quickly across the comic-book community. The official MIME type is application/vnd.comicbook-rar.
Comic book pages are stored inside .cbr files as .png, .jpg (JPEG), .bmp, .tiff, or non-animated .gif images, with .png and .jpg being by far the most commonly used.
Structured contents
Comic book pages stored in .cbr files are automatically ordered and can be viewed in single-page or dual-page mode. Pages are sorted by their image filenames inside the archive, so correct zero-padded numbering (e.g. 001.jpg, 002.jpg) is important for the right reading order.
Opening .cbr files
Because a .cbr file is a standard RAR archive, its contents can be extracted using any tool that supports unpacking .rar files. However, extracted images may not be displayed in proper order without manual sorting. For the intended reading experience, dedicated comic book readers such as CDisplayEx, YACReader, or Calibre handle page ordering and display automatically.
The .cbr format belongs to the comic book archive family alongside .cbz (ZIP-based), .cb7 (7-Zip-based), and .cbt (TAR-based). The RAR archive signature Rar! (hex 52 61 72 21 1A 07) is present at byte offset 0 in every valid .cbr file.
Security & safety
RISK: MEDIUMA .cbr is a RAR archive, so the same archive cautions apply: it could in theory hide files other than images, and a maliciously crafted archive could target a parser bug in the reader - so open comics from untrusted sources in an up-to-date reader and be wary of a .cbr that contains executables instead of (or alongside) page images. The images themselves are inert. Two practical notes: (1) generic ZIP-only tools will FAIL on a .cbr because it's RAR - use a RAR-capable archiver or a comic reader; (2) avoid sketchy "CBR reader" download portals that bundle adware - get YACReader/CDisplayEx/Calibre from their official sites. Online CBR converters upload your file to a third party - fine for public comics, not for anything private.
Format details
in a nutshellPrograms that open CBR files
Windows4 apps
7-Zip
Open-source To get the page images out: right-click > 7-Zip > Extract (7-Zip reads RAR). Not a reader - just extracts. 
Calibre
Open-source E-book manager that views CBR and converts comics to/from EPUB/PDF/MOBI. Drag the .cbr into the library. 
CDisplayEx
Free Lightweight comic reader (modern successor to the original CDisplay). Open the .cbr to read; reads CBR/CBZ/PDF. 
YACReader
Open-source Free comic reader + library manager. Open the .cbr to read page-by-page; handles CBR/CBZ/CB7/PDF. The best all-round free pick. 
macOS3 apps
The Unarchiver
Free To extract the raw images, open the .cbr with The Unarchiver (reads RAR). Not a comic reader.
YACReader
Open-source Free cross-platform comic reader/manager; open the .cbr to read. Handles CBR/CBZ natively.
Simple Comic
Open-source Free macOS comic reader; open the .cbr (and CBZ/PDF). Successor to the original Simple Comic. 
Linux2 apps
Okular
Open-source KDE document viewer with comic-book support; open the .cbr to read (needs unrar/unar backend for RAR). 
MComix
Open-source Dedicated GTK comic reader; open the .cbr (requires unrar/unar installed for RAR-based CBR). 
Android1 app
YACReader / CDisplayEx (Android)
Free Install a comic-reader app (CDisplayEx, Librera, or YACReader's mobile reader) and open the .cbr from storage.
Panels
Freemium Polished iPad/iPhone comic reader; import the .cbr (and CBZ/PDF) via Files/cloud. Great reading experience. Technical details
deep spec| MIME type | application/vnd.comicbook-rar |
| Magic bytes (hex) | 52 61 72 21 1A 07 at offset 0; ASCII signature Rar! followed by 1A 07 |
| RAR version flag | 7th byte 00 = RAR4; bytes 01 00 = RAR5 |
| Underlying archive | Standard RAR archive - .cbr is a .rar file renamed with a different extension, no internal format change |
| Stored image types | .png, .jpg / .jpeg, .bmp, .tiff, .gif (non-animated only) |
| Page order mechanism | Lexicographic sort of image filenames inside the archive |
| Image filename convention | Zero-padded numbers (e.g. 001.jpg, 002.jpg) to ensure correct lexicographic reading order |
| Viewing modes | Single-page and dual-page (spread) layout supported by dedicated readers |
| Compression method | RAR LZSS + prediction; compression gain is minimal since JPEG and PNG content is already compressed |
| Archive structure | Flat list or folder of image files; no embedded metadata standard |
| Format family | Comic book archive family: .cbr (RAR), .cbz (ZIP), .cb7 (7-Zip), .cbt (TAR), .cba (ACE) |
| DRM / encryption | No built-in DRM; RAR password-based encryption is supported by the format but rarely used |
| Extraction compatibility | Any RAR-compatible tool (WinRAR, 7-Zip, The Unarchiver) can unpack .cbr without dedicated comic software |
| Content type | Sequential art: comic book pages, manga scans, graphic novels |
| Released | ~2003 (CDisplay comic reader popularized the .cbr/.cbz convention) |
| Specification | en.wikipedia.org |
CBR conversions
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