Special keywords can be used as placeholders in the output file names, to be replaced with dynamic values during the execution. The set of available keywords depends on the module you are using. Right click on the text field of the File names settings panel to find out what are the available keywords

[CURRENTPAGE]

Replaced by the current page number in the input document.

Examples:
[CURRENTPAGE###] generates three digits file names like 001.pdf, 002.pdf
[CURRENTPAGE13] generates file names starting from 13, i.e. 13.pdf, 14.pdf
[CURRENTPAGE###13] generates three digits filenames starting from 13, i.e. 013.pdf, 014.pdf

[TIMESTAMP]

Replaced by the current date and time.

[FILENUMBER]

Replaced by the current file number.

Examples:
[FILENUMBER###] generates three digits file names like 001.pdf, 002.pdf
[FILENUMBER13] generates file names starting from 13, i.e. 13.pdf, 14.pdf
[FILENUMBER###13] generates three digits filenames starting from 13, i.e. 013.pdf, 014.pdf

[BASENAME]

Replaced by the original file name (without extension), it must be used together with other placehoders ensuring unique names.

Examples:
[CURRENTPAGE]_[BASENAME] generates 1_input-file.pdf, 3_input-file.pdf, etc

[BOOKMARK_NAME]

Replaced by the current bookmark name and only applicable when splitting by bookmarks.

Examples:
[CURRENTPAGE]_[BOOKMARK_NAME] generates 1-Introduction.pdf, 4-Chapter 1.pdf, etc

[BOOKMARK_NAME_STRICT]

Same as [BOOKMARK_NAME] with the difference that non-alphanumberic characters are removed.