When comparing FlashRenamer vs Rename-It!, the Slant community recommends Rename-It! for most people. In the question“What are the best bulk rename tools for Windows?” Rename-It! is ranked 7th while FlashRenamer is ranked 8th. The most important reason people chose Rename-It! is:
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.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro All-in-one batch file rename utility
Pro Easy to use functions
Pro Complete set of music features
Supports mp3, ogg vorbis, wma, mp4, flac, mpc, spx, tta, wv and more. You can also write tags based on filename.
Pro Search and replace within filenames
Pro Power users' functions
You can create your own rename rules with scripting, rename according to CSV lists, rearrange parts of the filenames, edit filenames in the text editor, extract media properties & metadata, such as width/height and duration. It is also possible to extend FlashRenamer with ExifTool for thousands of more properties and tags.
Pro Realtime preview shows changes before you actually rename
Pro Unlimited undo
Pro Fast and customizable
You can right-click context menus to quickly access FR when you need it, and save your favorite commands as presets.
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
Cons
Con Development ended in March 2016 (v.6.8)
Con Dated
Quite dated - last release or code update at least two years old.