Bulk File Renamer
Preview batch renames, number files, resolve duplicates and save renamed copies.
Private by design
Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.
How to use Bulk File Renamer
- Add files and choose their order. Originals stay untouched.
- Set a naming template, literal find/replace, case, prefix/suffix and optional numbering. Inspect every old → new filename.
- Save renamed copies into a new folder where supported, or download a ZIP. Download the CSV mapping for reference.
What are the limits of Bulk File Renamer?
Files are processed on your device and are not uploaded. Use a current browser; memory-constrained devices may need smaller inputs. Cancellation stops processing. Originals remain unchanged. Up to 500 files and 100 MB combined. Renaming does not convert file contents or change extensions. Unsafe characters and reserved device names are normalized; case-insensitive duplicate names receive numbered suffixes. Folder saving requires the File System Access API and creates a new subfolder; cancellation or a write error may leave partial output. ZIP packages renamed copies without recompression.