Free online TAR.BZ2 to ISO converter

A program or device that accepts ISO disc images cannot use a TAR.BZ2 archive directly. The practical conversion is to decompress the archive, then write its extracted directory tree into a new ISO image.

What the TAR.BZ2 format is

.tar.bz2 combines two formats: TAR collects files and directories into one archive, while BZIP2 compresses that TAR file. Linux and Unix software commonly distributes source code, backups, documentation, and installation files in this format; typical creators include tar with bzip2, package build systems, and backup tools.

A TAR.BZ2 file is not a disc image. It has no ISO filesystem, optical-disc metadata, or boot information unless those items are merely stored as ordinary files inside the archive.

What the ISO format is

An ISO file is a sector-oriented image containing an optical-disc filesystem, usually ISO 9660 with optional Joliet or Rock Ridge extensions. Operating systems can mount it as a virtual disc, disc-authoring software can burn it, and virtual machines or installers may accept it as removable media.

ISO is useful when a program requires one disc-image file or when a fixed directory tree must be distributed and mounted unchanged. It is not automatically smaller than TAR.BZ2: ordinary ISO creation does not compress the files, so the result is usually larger than the source archive.

How to actually convert TAR.BZ2 to ISO

Using Linux, macOS, or another Unix-like system

1. Create an output directory and extract the archive into it:
   mkdir extracted
tar -xjf archive.tar.bz2 -C extracted
2. Install xorriso if it is not already available, then create the ISO:
   xorriso -as mkisofs -o archive.iso extracted/
3. Check the result by mounting archive.iso or listing it with:
   isoinfo -i archive.iso -f

On systems with genisoimage or mkisofs, the equivalent command is genisoimage -o archive.iso extracted/. Preserve the extracted directory as the ISO root; if the archive contains a single top-level directory, decide whether that directory or its contents should appear at the disc root before creating the image.

Using Windows tools

1. Open the archive with 7-Zip and extract it. If 7-Zip first produces a .tar file, extract that file again to obtain the actual contents.
2. Create the ISO from the extracted folder with Microsoft oscdimg, available in the Windows ADK:
   oscdimg -m -o extracted archive.iso
3. Mount archive.iso in File Explorer and verify that the expected files appear.

For a one-off conversion without installing desktop software, the built-in converter at 101convert.com can process the file for free. Uploading an archive sends its contents to a remote service, so use local extraction and ISO creation for confidential data or very large archives.

Quality, compatibility, and limitations

• Extracting and repacking does not preserve TAR metadata such as archive ordering, POSIX ownership, permissions, symbolic links, hard links, or extended attributes in a universally usable way. The ISO stores the extracted files according to the ISO filesystem rules.
• A normal ISO created from a folder is not bootable. Making it bootable requires the original boot image and format-specific options, such as an El Torito boot catalog; merely placing boot files in the archive is insufficient.
• ISO 9660 compatibility limits filenames and directory depth. Use Rock Ridge for Unix permissions and long names on Unix systems, or Joliet for longer names on Windows, for example with xorriso -as mkisofs -J -R -o archive.iso extracted/.
• ISO images have a fixed size determined by their contents and filesystem overhead. BZIP2 compression is lost unless files inside the archive are themselves compressed.