I use Touch Comic to read comics on my Nokia 5530 XpressMusic, but it only supports the CBZ format. Here’s how you can convert CBR comic files to CBZ, and CBZ to CBR.

What are CBZ and CBR files?


 

CBZ and CBR files are nothing but zips (in case of CBZ) and rars (in case of CBR) of a bunch of images, with the extensions changed. So you can extract either of them using any archive extractors (WinZip, WinRAR, 7-Zip) to get the images contained in them.

How to convert CBR to CBZ?


Step 1: Extract the CBR file using any file archiver. I use the open source and free 7-Zip.
Extract the file

Step 2: After extracting you will get a folder containing a lot of image files.
All the images get extracted to a folder

Step 3: Right-click the folder and compress it to a ZIP file.
Add the folder to zip
Change the archive format to Zip:
Change the archive method to zip

Also change the Compression level to Store. This way there will be no compression.
Chage compression method to Store
You will get a zipped archive of the folder.
Zip the folder

Step 4: Rename the .zip file to .cbz
Rename the zip file to change the extension 

Press Yes and behold! CBR to CBZ! :D
CBR converted to CBZ :D

How to convert CBZ to CBR?


 

The procedure is exactly the same as above except that you create a RAR of the folder.

Step 1: Extract the CBZ file using any file archiver.

Step 2: After extracting you will get a folder containing a lot of image files.

Step 3: Right-click the folder and compress it to a RAR file.

Note: You will need WinRAR to compress the folder to a RAR file. It is also free to use like 7-zip.

Step 4: Rename the .rar file to .cbr

That’s it. :)

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