A lightweight desktop utility (built with Go + Fyne) to filter files and preview bulk renames before applying them.

• Website : https://renforgeapp.web.app
• Repo: https://github.com/blackarck/renforge
• Download : https://github.com/blackarck/RenForge/releases/tag/latest
• 

• Select a folder (non-recursive for now)
• Shows matching files with full file names
• Preview column shows the new file name after applying rename steps
• Preview text wraps and uses a smaller font so long names are readable

Add multiple filter rules like:

• starts with → The
• contains → Whale
• ends with → .mp3
• extension → png

Options:

• Match ALL (AND) or Match ANY (OR)
• Case sensitive toggle

Add multiple rename steps and see the preview update live:

Supported rename steps:

• Remove text
• Replace text
• Insert before extension
• Append
• Prepend
• Change extension

Examples:

• Remove vivek from all file names
• Insert (awesome) before the extension
• Change extension to xyz

• Browse results with Previous / Next (page size = 10)

Before renaming, FileRenUtil checks and warns about:

• Invalid names (empty, invalid characters, reserved names)
• Duplicate preview conflicts (two files would become the same name)
• Target exists on disk conflicts

These are skipped during Apply.

• Dry run mode lets you generate a rename plan without touching files
• Apply performs the renames that are safe to execute

Optional Undo Log (CSV) export so you can revert changes later. The log includes:

• old_path, new_path, status, reason, etc.

Tip: Keep your undo CSV in the same folder as the renamed files for easy recovery.

• For the latest version, check the GitHub repo releases (if/when you add them): https://github.com/blackarck/renforge

• Go (recommended: latest stable)
• Fyne dependencies (platform-specific)

Fyne setup docs (recommended): https://developer.fyne.io/started/

go run .

go build -o filerenu .

• Recursive folder scan (include subfolders)
• Two-phase rename to support swaps/chains safely
• Regex filters and regex rename steps
• “Select subset” (checkbox per file)
• Export rename plan without Apply
• Export rename script

RenForge is licensed under a dual-license model:

• Non-commercial use: Free under CC BY-NC 4.0
• Commercial use: Requires a paid commercial license

If you are an organization or plan to use RenForge commercially, please contact us for licensing.