Files with ctg extension can be typically found on memory cards of Canon digital cameras along with captured photos. Contains index and other information for faster loading of the pictures.

There are 3 other file types using
the CTG file extension!

empty icon.ctg - BMC Software PATROL file

empty icon.ctg - ChessBase opening book data

empty icon.ctg - WhereIsIt catalog group

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CTG file extension - Canon catalog index

What is ctg file? How to open ctg files?

File type specification:

Various data file type icon Various data file type

File extension ctg seems to be best known for its use for so called catalog files generated by certain Canon digital cameras used since early 2000s.

You can usually find these files on memory cards for each picture set. These are used to provide additional information for viewing and managing of associated photographs.

Updated: January 5, 2021

Help how to open:

Most likely used automatically by Canon programs or devices. Should not be manually editted by the user.

How to convert:

You cannot convert these files to anything else, nor you can recover photos from them. You have to look for the actual RAWs.

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