ChessBase can read and write databases in different formats:
Note: This program version works with a new data format. The file extension is *.2cbh.
The 2CBH Format
The "2CBH" format gets along with less files and uses modern caching methods of the operating system. Furthermore, it no longer needs search accelerators, whose update always brought comprehension and performance problems. 2CBH is conceptually simpler and thus more robust. Functions such as reorganizing therefore sometimes run twice as fast as in the old CBH format. The new format needs more space on the disk, which is relatively unimportant with today's disk sizes.
The CBH format (extension CBH)
This is the native format, with powerful indexes and fast searches across multiple databases. It also supports a large number of annotation features, including graphic and spoken commentary, videos, text reports, and many other functions described in this reference. Double-clicking a file with this symbol will automatically start ChessBase and open the database.
The book format (extension CTG)
This is the database format for openings books.
The PGN format (extension PGN)
"Portable game notation" is a text format that is very popular for E-mail and on the Internet. Most chess playing programs can handle PGN.
This is how to create a PGN file:
In the database window click Application Menu – New – Database. In the database file manager select "PGN" as the file type. Use Drag & Drop to copy games into the new database. They are automatically converted into the PGN format.
CBF format
This is the file format of earlier versions of ChessBase. You can right-click a CBF database and use "Convert to new format" to make it a CBH file.
CBONE format
ChessBase now supports a new database format with the extension *.cbone. This format is listed in the dialogs for opening and saving files. The advantage of this format is that in contrast to the CBH format the whole database is stored in one file. This makes the format suitable for backups and for sending to other people. If you use a large number of small files you should consider using this format. It is possible to exchange games between CBH, CBF and PGN databases. You can create databases in any of these formats and copy games into it.
CBCloud Format
The CBCloud format is made up of only four files. There are no index files for the players, tournaments, etc. The same data can be stored as in the CBH format, but due to the lack of index files there are less functions to access the data. Sorting and two-level deleting is possible.
See also List of all filenames.