Am looking for a tool that will randomize filenames.
have looked all over Internet but could not find a small tool that does this all.
Filename Randomizer (from xdpirate) has it limitations.
I, too, am seemingly always after clever renamers and such, and have found this one intriguing, although I haven't mastered it yet. Section 2.7 of the manual talks about how it works to control duplicates on the fly. I think it would meet your criteria of fixing the file length, as it allows padding of the result (manual page 6).
I use it now and then for simpler renaming tasks.
A regex-enabled renamer I know of is PCMAG's multiren, but that's not free.
I have looked at Bulkrenameutility a few times in the past, but I -hate- the messy user interface.
I am more in favor of Advanced Renamer and Flash Renamer (an Explorer like interface).
Have looked at a lot of renamers over the years, but I am still sticking to Flash Renamer (not freeware) as being the best from my point of view.
Regretfully though there will be no new version, only patches if required.
Recently discovered a feature to rename files (using Flash Renamer) using a 'preset'. Didn't know it was there.
Out of sheer curiosity, may I ask why you do this?
I concur about BulkRenameUtility it seems very powerful, but the user interface stands in my way of both proceeding with confidence and ending up with the results I wanted.
I am glad to learn about Advanced Renamer and Flash Renamer-- I didn't know either and they are both good tools it seems. I will check out the free Advanced Renamer next time I have the need.
And I second skwire's curiosity for the true random renaming; it's a bit extreme if humans are meant to consume the names (I'm sure they're not), but admit that unique random names are a useful interim step in processes where you're aggregating lots of directories.