When comparing Rename-It! vs Renamer, the Slant community recommends Renamer for most people. In the question“What are the best bulk rename tools for Windows?” Renamer is ranked 2nd while Rename-It! is ranked 7th. The most important reason people chose Renamer is:
It's not a huge application you have to install on your computer. Very compact and tiny.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Really fast and safe renaming
It can rename thousands of files in seconds and does it in a single transaction so that if anything fails it renames nothing at all.
Pro Can rename the full path
You can change file's directory or rename the full path to the file.
Pro Open source
Pro Can create numbered series
You can ask it to rename so it's Image001, Image002, etc.
Pro Supports regular expressions
Additional to wildcards, and string replacements, it can use RegExp.
Pro Incorporates in the Explorer context menu
Pro Detects cycles and handles them
If you rename A -> B and B -> A (or any cycle), it'll automatically do A -> T, B -> A, T->A.
Pro Command-line arguments
You can create a script invoking Rename-It! from the CLI with some arguments so it performs the renaming and returns the correct exit code.
Pro Can use audio file ID3 tag info
Pro Lightweight
It's not a huge application you have to install on your computer. Very compact and tiny.
Pro Free for personal use
A generous 5 presets in the free version is more than enough for the overwhelming majority of use-cases most home users will ever need.
Pro Easy to use and very powerful
Pro Accurate and very flexible
Cons
Con Dated
Quite dated - last release or code update at least two years old.
Con Freemium
Limited to 5 Presets for free users.