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littlekit.app

Batch file renamer

Rename multiple files with a live filename preview, prefixes, numbering and a ZIP download of the original contents.

Choose your files

Choose files to get started, or drag and drop them here.

16 MiB per file · 32 MiB combined · 128 files

Preview portable output names. Reorder files to control numbering, then download them together.

How it works & useful details

Preview portable output names. Reorder files to control numbering, then download them together.

Everything runs locally. Files are never uploaded. Maximum 16 MiB per input file, 32 MiB combined, and 128 files. Processing can be cancelled.

About this tool

Batch file renamer applies a consistent naming pattern to several files at once, with a live preview of every new name before anything is packaged. Prefixes, sequential numbering, and extension handling are all configurable.

The original file contents are not modified; the renamed result is delivered as a ZIP archive built locally. If a pattern would produce duplicate names, the preview shows the collision so you can adjust it.

How to use it

  1. Add the files you want to rename.
  2. Set the prefix, numbering style, and starting number.
  3. Check the live preview of the resulting file names.
  4. Download the ZIP containing the renamed files.

Worked example

Three photos, IMG_0001.JPG, IMG_0002.JPG, and "Holiday photo (1).JPG", renamed with find "IMG_" → nothing, prefix "rome-2026-", lowercase, and numbering switched on:

IMG_0001.JPG            →  rome-2026-001-0001.JPG
IMG_0002.JPG            →  rome-2026-002-0002.JPG
Holiday photo (1).JPG   →  rome-2026-003-holiday photo (1).JPG

Numbers follow the order in the list, so drag files into the order you want before downloading. The extension is left as it is, so files keep opening in the same programs. The renamed files are downloaded together in a ZIP, and their contents are unchanged.

Naming files that sort and travel well

  • Put dates in ISO order (2026-09-24) so files sort chronologically by name.
  • Use zero-padded numbers (001, 002) so that 10 does not sort before 2.
  • Prefer lowercase and hyphens. Spaces and parentheses work on most systems but need quoting on the command line and are encoded as %20 in URLs.
  • Characters that Windows does not allow, such as : ? * < > | " \ /, are replaced so the names work on every operating system.

Your original files are never modified. The browser cannot rename files on your disk, so the tool produces renamed copies inside a ZIP that you extract wherever you like.

Frequently asked questions

Are my original files changed?

No. The renamed copies are packaged into a new ZIP; the files on your device stay untouched.

What happens if two files get the same name?

The preview highlights the collision and the tool refuses to build an archive with duplicate entries until the pattern is adjusted.

What are the limits?

Up to 128 files, 16 MiB per file, and 32 MiB combined.