Question 1

Does this tool actually rename files on my computer?

Accepted Answer

No. The tool generates a preview of the new filenames and lets you download a script or apply renames via the File System Access API (where supported). Your files are never uploaded to any server — all processing happens in your browser.

Question 2

Can I use regular expressions for batch renaming?

Accepted Answer

Yes. The tool supports JavaScript-style regular expressions for both matching and replacement. For example, you can use a regex like /^IMG_/ to match filenames starting with "IMG_" and replace them with a custom prefix.

Question 3

How do I add sequential numbers to filenames?

Accepted Answer

Select the "Add numbering" option, choose where to insert the number (prefix or suffix), set the starting number, and optionally pad it with leading zeros (e.g., 001, 002). You can preview the result before confirming.

Question 4

Is there a limit to how many files I can rename at once?

Accepted Answer

There is no hard limit imposed by the tool. Performance depends on your browser and device. In practice, renaming hundreds or even thousands of files works smoothly since no file content is read — only filenames are processed.

Question 5

Can I undo a batch rename?

Accepted Answer

Always preview renames before applying them. If you have already applied a rename and want to revert, you can reload your original file list and apply a reverse transformation. It is a good practice to keep a backup of filenames before making large-scale changes.

Batch File Rename