When comparing Renamer vs Flexible 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 Flexible Renamer is ranked 9th. 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
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Pros
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
Pro Powerful but easy to use
It has many options, including renaming using tags (ID3, Exif...), can number files, use wildcards or regular expressions, walk a hierarchy of folders.
And it has presets for common renaming tasks, like removing parentheses, "Copy (n)" or "Shortcut of", and so on. Its preview feature avoids errors, and warns (a bit late though) of naming conflicts.
Pro Free
Freeware and lightweight (archive is less than 2 MB).
No install, but might need removing options of Explorer integration / scripting if removing.
Pro Context menu in Explorer
Can add a context menu to Windows Explorer to rename files in a chosen folder.
Pro Tag management
Can rename using ID3 (music), Exif (photo), IPTC (images), DOC or HTML tags.
Pro Has many translations
Available in English, Japanese, French, Spanish and German.
Pro Scriptable
You can write scripts in VBScript or in JScript (native Windows scripting languages) for complex renaming operations.
Cons
Con Freemium
Limited to 5 Presets for free users.
Con Seems to be no longer maintained
Last updated in 2011 (v. 8.4). Yet it works fine in Windows 10 and still does a tremendous job.