Bulk Renamer

Batch renames the files in a folder using rules: find and replace, sequential numbering, prefix/suffix, letter case, space handling, date prefix. Changes appear in a live preview first, and the last batch can be undone.

What it does

Use this to tidy messy names like IMG_1234.jpg, scan 001.png, document(1)(2).pdf, number photos sequentially, give a project's files a consistent naming scheme, or clean spaces into underscores. It is the natural twin of the File Organizer: first sort by type, then name them properly.

How to use

  1. Click Choose folder and pick the folder to rename in.
  2. Set your rules (any of them, as many as you like):
    • Find and replace: swap specific text for something else (Regex option for advanced use).
    • Letter case: lowercase, UPPERCASE or Title Case.
    • Spaces: turn into underscore (_), dash (-) or remove them.
    • Prefix / Suffix: add text to the start, or before the extension.
    • Sequential number: start value, digit padding and position (start/end).
    • Date prefix: prepend the file's modified date (YYYY-MM-DD).
  3. Read the Preview table to see each file's old and new name. Conflicts are flagged in red.
  4. Press Rename.
  5. If you are not happy with the result, press Undo to reverse the last batch.

Examples

Organize phone photos: Choose folder, prefix holiday_, sequential number (at end), apply. holiday_001.jpg, holiday_002.jpg...

Clean spaces: Spaces → underscore, letter case lowercase. Project Deck.pdf → project_deck.pdf.

Change a version tag: Find final, replace v2. report final.docx → report v2.docx.

Sort by date: Add date prefix. notes.txt → 2026-06-12_notes.txt.

Things to watch

  • Files that would land on the same new name (a conflict) are shown in red, and applying is blocked while any conflict exists; fix the rule first.
  • Renaming only covers files in the chosen folder; it does not descend into subfolders.
  • The last batch can be undone; for older operations you would fix the names manually.

License

Productivity tool; unlimited on every plan, including the Free tier.