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Batch File Renamer

Rename files in bulk with find/replace, prefixes, casing, numbering, and instant ZIP download—all locally.

Open utility

file-renamer utility screenshot

What it does​

Upload a stack of files, preview new names with regex or literal find/replace, add prefixes, suffixes, or numbering, and download the renamed set as a ZIP. Everything runs in the browser so your files stay local.

When to use it (and when not to)​

Use it when:

  • You need to normalize drawing names or add job numbers before sending a package.
  • You want to bulk apply numbering or prefixes without scripting.
  • You prefer to keep renaming offline with a quick ZIP output.

Avoid it when:

  • You need to rename thousands of files on disk; use a CLI script instead.
  • You must retain folder hierarchy from nested directories; flattening may not be desired.

Inputs and outputs​

Inputs​

InputDescription
Files to renameDrop the files you want to process.
Find/replace rulesUse literal or regex patterns to transform names.
Prefix/suffixAdd job numbers, revs, or other tags.
NumberingSet start, increment, and padding for sequence numbers.
Casing optionsOptional upper/lower/kebab conversions.

Outputs​

OutputFormatNotes
Preview tableOn-screenSee old vs. new names before exporting.
Renamed filesZIPDownloadable archive with updated filenames.

How to use​

  1. Drop the files to rename.
  2. Apply find/replace, prefixes, suffixes, or numbering.
  3. Review the preview to confirm collisions are handled.
  4. Download the ZIP of renamed files.
  5. Share or archive the renamed package.

Example dataset: Upload P-001.pdf, P-002.pdf; find 'P-' and replace with 'FAB-', add prefix 2025_, start numbering at 10.

  • Expected output: Downloads a ZIP with files named 2025_FAB-10.pdf and 2025_FAB-11.pdf.

Accuracy and verification​

  • Renaming happens in the browser; keep originals until you verify the ZIP.
  • Regex patterns are powerful—test on a small set first.
  • Name collisions are handled in the preview; resolve them before export.
  • Large batches are limited by browser memory; split them if needed.

FAQ​

  • Do regex patterns work? Yes. Use standard JavaScript regex for advanced renames.
  • Is folder structure preserved? Files are flattened into a ZIP with new names.
  • Is data uploaded? No. Everything runs locally.
  • How many files can I rename? Depends on browser memory; split very large sets.
  • What about file contents? Contents stay unchanged; only names are updated.

Changelog​

  • Initial documentation.

Feedback / bug report​

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