Bulk Rename Preview

No — it is a preview tool. You paste a list of filenames, build a rename rule, and see exactly what every name would become. To apply the changes, download the CSV mapping (original, renamed) and use it with your file manager, a shell script, or a batch-rename utility.

Find & replace (plain text or regex, optionally case-sensitive), a prefix and/or suffix, a counter (prefix or suffix numbering with configurable start, padding, and separator), and case transforms (lowercase, UPPERCASE, or Title Case). Rules combine in a predictable order: replace → case → prefix/suffix → numbering.

After applying the rules, the tool checks whether two different original names would map to the same new name. Conflicting rows are flagged in red with a warning, so you can adjust the rule before applying anything.

Set Numbering to "Prefix counter", Start to 1, Padding to 2 (for two digits), and Separator to _ (underscore). The counter increments for each file in list order, producing 01_photo.jpg, 02_photo.jpg, and so on.

Yes. Enable the Regex toggle and the Find field is treated as a regex pattern with global matching. The Replace field supports the same substitutions as JavaScript String.replace, including capture groups like $1. Invalid patterns show a clear error on the affected rows.

Yes. All renaming logic runs in your browser; nothing is uploaded and the tool works fully offline. The CSV export is generated locally on your device.