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CBT comic archive file format

.cbt  ·  archive (comic book)  ·  introduced 2002 by Comic reader community

What is a CBT comic archive file?

CBT is a TAR-based comic book archive. Like CBZ (zip) and CBR (rar), it bundles page images for sequential reading; the only difference is the underlying container. CBT is rare in the wild because most comic readers default to CBZ.

Most readers reach this page after double-clicking a .cbt file and finding their operating system unsure what to do with it. The good news: CBT comic archive is a well-understood format with mature tooling on every major platform. It is supported in one click by mainstream archivers on Windows, macOS, and Linux.

How to extract a CBT comic archive file

Opening a .cbt file is straightforward on every modern operating system. The exact steps depend on which platform you are on:

On Windows

  1. Locate the .cbt file in File Explorer.
  2. Right-click the file. If you have 7-Zip installed, choose 7-Zip → Extract Here. On Windows 11 the built-in extractor handles ZIP, 7z, RAR and several other formats directly through Extract All…
  3. If prompted, pick a destination folder and click Extract.
  4. The extracted files appear in a folder next to the original archive.

On macOS

  1. Find the .cbt file in Finder.
  2. Install The Unarchiver from the Mac App Store, or Keka for both creating and extracting.
  3. Right-click the file → Open With → The Unarchiver (or just double-click after Unarchiver is set as the default).
  4. The extracted folder appears next to the archive.

On Linux

  1. Use your file manager: right-click the archive → Extract Here (file-roller on GNOME, Ark on KDE).
  2. On the command line, run one of: 
    7z x archive.cbt    # works for almost any format
  3. The files appear in the current directory.

How to create a CBT comic archive file

To pack files into a .cbt archive, you typically need an archiver that supports writing this format. Not every tool can create every format — for example, only WinRAR can create real RAR files. The sidebar lists the software known to read and write CBT comic archive.

On the command line, the canonical create command is:

# Use 7-Zip, PeaZip, or the format's reference tool to create .cbt files.

If you regularly create archives at scale, a dedicated archive automation suite can wrap this command in scheduled jobs, integrity checks, and offsite replication.

Strengths

  • Tar simplicity
  • Preserves page order

Weaknesses and limitations

  • Uncommon — most readers expect CBZ or CBR
  • No compression

Typical use cases

  • Comic book sequential image archives

Technical details

CBT comic archive uses the TAR (no compression) algorithm and is identified on disk by the magic byte sequence (tar header). The standard MIME type is application/x-cbt. The format is an open specification and is free for any use.

Frequently asked questions

Is CBT comic archive safe to open?

Archive files are containers — they are only as safe as what they contain. A .cbt from a trusted source is fine; one received from a stranger can hold malicious executables, scripts, or files engineered to exploit bugs in your archiver. Always keep your archiver updated, and never run unknown executables that come out of an archive. A safe workflow is to extract into a sandbox and scan the contents before opening anything.

What is the maximum file size?

Modern implementations support archives in the multi-terabyte range. The practical limit is your filesystem (FAT32 caps at 4 GB; ext4, NTFS, APFS, and exFAT all comfortably handle multi-TB files).

Can I password-protect a CBT comic archive?

Some archivers can wrap CBT comic archive files in an encrypted container, but the format itself does not always include built-in encryption. Check your archiver's documentation.

How does CBT comic archive compare to other formats?

See our format comparison pages such as ZIP vs 7z, ZIP vs RAR, and tar.gz vs tar.xz for side-by-side feature tables.

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