# Set the Character Set During Filtering

You can convert the character set of a file at the time the file is filtered.

To specify the source character set of a file, invoke `source_encoding()` on a `Configuration` object, before creating a session, using any value in the enumerated list `Encoding` in `Keyview_Enumerations.hpp`. See The Configuration Class for more information.

To specify the target character set, invoke `target_encoding()` on a `Configuration` object with any value in the enumerated list `Encoding` in `Keyview_Enumerations.hpp`.

Not all values of the enumerated list can be used as a target character set. Coded Character Sets lists character sets that can be used as output.

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