ReNamer is a free portable Windows tool that allows you to rename multiple files at once. It is easy to use because it offers specialized rules for every possible file renaming scenario (see options with screenshots below).
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You can simply drag and drop files and folders to the ReNamer interface. This allows you to rename multiple files at different locations in one go. You can also apply multiple file renaming rules at once.
Probably the most important feature of ReNamer is that you can preview the results before actually renaming multiple files. I recommend the use of this function always because reversing the renaming of multiple files is often quite difficult.
I tried the installable version of ReNamer on Windows 7 and the portable version on Windows PE 3.0.
Rules to rename multiple files with ReNamer
Insert: Insert specified text into the filename.
Delete: Delete a portion of the filename (by character positions).
Remove: Remove all occurrences of specific text.
Replace: Replace text occurrences.
Extensions: Change file suffixes.
Strip: Remove predefined character sets (numbers, for example).
Case: Capitalize, to lower case, to upper case, invert serialize.
Serialize: Put file names into an alphanumeric order.
Cleanup: Clean up file names to conform to naming conventions.
Translit: Transliterate non-English characters.
RegEx: Use regular expressions.
PascalScript: Use a Pascal/Delphi script.
UserInput: Use the entered list to rename multiple files.