Batch File Renamer

1. Drop files into Drop files here to rename them, or click browse files to select individual files.
2. Click Select a folder when the browser supports folder selection.
3. Set Prefix, Suffix, Find, Replace with, and any optional numbering, date, dimension, extension, or collision settings.
4. Review Original name, Proposed name, Status, and Notes, then choose the output you need.

Rename multiple files with Find and Replace

Find and Replace with work on the base name before the extension. Plain-text matching ignores case unless Case-sensitive find is checked. Turn on Treat "Find" as a regular expression for pattern matching. An invalid pattern shows an error and disables the downloads and manifest exports until it is corrected.

IMG_001.jpg
Find: IMG_
Replace with: trip-
Proposed name: trip-001.jpg

Case conversion runs after replacement. Prefix and Suffix are added around the resulting base name. When selected, Also apply a basic unsafe-character cleanup changes unsafe characters to hyphens, reduces repeated spaces and hyphens, and trims spaces, dots, and hyphens at both ends.

Add sequence numbers, dates, and image dimensions

Enable Add a sequence number to place a padded number Before the name or After the name. Set Start at, Step, and Zero padding (digits). The counter advances through included files in their selection order, with hyphens separating the number from the name.

Add a date token uses Today's date or File's last-modified date, formatted as YYYY-MM-DD. Add image dimensions (WxH) - only when readable appends dimensions after the browser decodes a recognized image extension. If decoding fails, the dimensions stay out of the name and the table records a note.

Review duplicate names before downloading

Names are compared without regard to case. With Auto-resolve collisions with a numbered suffix off, duplicate proposed names receive Collision - unresolved, and the download buttons stay disabled. Turn it on and choose Parentheses: name (2).ext, Dash: name-2.ext, or Underscore: name_2.ext to number later matches.

Extension handling keeps the original extension by default. Choosing Change extension to… changes the downloaded name only; file bytes are copied unchanged, so this does not convert the file. The mapping table can add a content-mismatch warning when a recognized signature conflicts with the new extension.

Choose a download or manifest

• Use Download renamed copy when exactly one file is included.
• Use Download ZIP + manifest when at least two files are included. The ZIP contains the renamed files, manifest.csv, and manifest.json.
• Use Manifest CSV or Manifest JSON when you need the mapping without downloading the files.

When to use Batch File Renamer

Use Batch File Renamer when the same naming rules apply to several selected files. The page reads files with browser APIs and creates local downloads. Its code contains no fetch, XMLHttpRequest, sendBeacon, or form post that sends file contents. For related file-organization tasks, see Organize Tools.

Frequently asked questions