Basic Examples (6) 

Easily alter the FileBaseName of a file:

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Simultaneously append and prepend:

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Apply arbitrary functions to base names of files:

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Use a custom function and then lowercase all characters:

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Use the "NewDirectory" option to copy or move files to a different directory:

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which equivalent to this:

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Files are not actually edited (copied or moved/renamed) on disk unless the option "Action" is specified:

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To non-destructively copy a file to one with new name, set the option "Action" to "Copy":

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Setting the option "Action" to "Move" changes the file in-place:

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Options (3) 

The option "AddMissingExtension" uses FileFormat to add an appropriate extension:

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If a file with the new name already exists it will fail unless you set OverwriteTarget → True:

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Use "LowercaseExtension" or "Lowercase" to lower-case the extension or entire filename, respectively:

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Possible Issues (1) 

Be careful when renaming files with option "Action"→"Move". In this case, FileNameEdit performs a CopyFile and DeleteFile in sequence:

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