Batch File Renamer Rule-based or table-mapping bulk rename, packed into a downloadable ZIP

What is the Batch File Renamer?

This is a completely free online tool that lets you select multiple files at once (photos, documents, videos — any file type) and rename them all in seconds, either with rule-based patterns or a custom old/new name mapping table. The renamed files are packed into a single ZIP file you can download instantly. Everything happens locally in your browser — your files are never uploaded to any server, keeping your data completely private.

Two Renaming Modes

• Rule-based: Add a prefix, suffix, sequence number (custom start number and zero-padding), find & replace (plain text or regex), and case conversion. New filenames are generated automatically based on your rules.
• Table Mapping: If every file needs a completely different, non-pattern-based new name, paste an "oldName,newName" list, or type each new filename directly into the editable table.

Who is this for?

• Photographers organizing large batches of photos with dates or sequence numbers
• Office admins standardizing document filenames
• Video editors and designers who need to bulk-rename asset files
• Online sellers organizing product image filenames

Frequently Asked Questions

Q1: Are my files uploaded to a server?

No. This tool uses the browser's native File API and the JSZip library — all renaming and zipping happens entirely on your own device. Your file content never leaves your computer.

Q2: What file types are supported?

Any file type is supported, including images (jpg/png), documents (pdf/docx), videos, and archives. This tool only changes the filename — it never alters or compresses the file's actual content.

Q3: Can I change the file extension?

Currently the tool only renames the base filename. The extension (like .jpg or .pdf) is automatically preserved to prevent files from becoming unopenable.

Q4: What happens if new filenames collide?

The tool detects and highlights duplicate new filenames in real time. Adjust your rules or table entries so all new filenames are unique before downloading the ZIP.