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PRODUCTIVITY

Bulk File Renamer

Drop in a batch of files and build a rename pattern from find-and-replace, prefixes, suffixes, case changes, and sequential numbering, with a live preview before downloading every renamed file in one .zip.

Tool statusRuns in your browser
Preview

Drop files to rename

Drop files to renamechoose a file
Any file type · up to 2.0 MB. Read in your browser, never uploaded.

Add files to preview their new names.

Preview

Add files to preview their new names.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Bulk File Renamer?

Drop in a batch of files, build a rename pattern, and download every file under its new name in one .zip — all processed locally in your browser.

UNDERSTAND THE TOOL

How to bulk rename files

Building a rename pattern

Combine a find-and-replace (plain text or a regular expression), a prefix, a suffix, and a case transform. Every change applies to the file's base name only — the extension is handled separately by the "Keep original extension" option, so a find-and-replace can't accidentally mangle a file's .jpg or .pdf.

Sequential numbering

Numbering counts up from the order files currently appear in the list, starting at whatever number you set, with as many leading zeros as the "Digits" setting asks for. Removing a file renumbers everything after it, since the count is always based on the current list, not when each file was added.

Conflicts and downloading

If a pattern produces the same name for two or more files, every affected row is flagged and the download button is disabled until the pattern no longer collides. Once every result is unique, "Download all as .zip" bundles every file under its new name into a single archive.

Preview and conflicts

The preview flags duplicate output names before you use them. Numbering follows the file list order, so reordering files changes generated suffixes.

Numbered suffix

With start 1, padding 2, and separator -, the first three files receive -01, -02, and -03.

Filename preview notes

Only file names are read to build the preview. The browser cannot rename the original files until you download or apply results outside this page.

Frequently Asked Questions

Does this change the files, or just what they're called?

Only the file name changes. The bytes inside each file are copied unchanged into the downloaded .zip.

Can I use a regular expression in Find?

Yes. Turn on "Treat Find as a regular expression" and the Find field is compiled as one, with every match replaced.

What happens if my pattern is an invalid regex?

Affected names are left unchanged in the preview rather than the tool breaking, so you can keep editing the pattern until it's valid.

Can I rename just one file?

Yes, though for a single file the Case Converter or a plain rename in your file manager is usually just as fast — this tool's advantage is doing dozens of files at once.

Does the preview rename files on disk?

No. The preview only calculates new names. Your original files stay unchanged unless you apply the names outside this page.

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