Bulk File Renamer

Rename many local files consistently with a before/after preview.

Choose files

Prefix

Suffix before extension

Find

Replace with

Numbering

Start number

Case

Sanitize reserved filename characters

Choose filesBrowsers cannot rename files on your disk in place. This tool creates downloadable copies with the new names.

Rename collision & mapping report

Preview the exact before/after filename map, add regex replacement and zero-padded sequence control, and block duplicate or Windows-reserved output names before exporting copies.

Use regex findNumber padding

—Files

—Changed names

—Collisions / reserved

Original	Preview	Status

File handling notes

connects ZIP creation/extraction, archive inspection, GZIP, TAR/TAR.GZ extraction, ZIP merging, multi-ZIP extraction, splitting/joining, duplicate detection, renaming, folder summaries, file inventories, and file-type inspection without requiring a file upload where the browser APIs support the task.

Archive and safety boundaries

Browser memory can limit very large files. TAR extraction supports ordinary TAR/USTAR regular files and directories rather than every PAX/sparse/link edge case. Password-protected or uncommon ZIP compression methods can exceed JSZip support. Normalized download paths do not grant arbitrary filesystem write access.