Rename a batch of files by pattern — without uploading anything

No folder selected

How to use this tool

Open index.html in your browser (works as a normal web page — no install).
Click Choose a folder… (Chrome/Edge/Brave) or Or select files instead (Safari/Firefox) and pick the folder you want to rename.
Type a rename pattern, using the token buttons ({name}, {counter}, {date}, {ext}) to insert them, plus any custom text you like.
Check the live preview table. If anything is flagged as a collision, adjust the pattern until the warning clears.
Click Rename files, confirm, and you're done — download the rename log if you'd like a record.

Rename a whole folder of files at once

Pick a folder, build a rename pattern with tokens like {name}, {counter}, and {date}, preview every before → after name, and catch naming collisions before anything changes.

Nothing is uploaded anywhere — everything happens inside this browser tab, on this device.

What is this page?

This is the real Bulk File Renamer — the same tool Untracked sells as a download — running free, right here in your browser. Your files are processed entirely on your own device: nothing is uploaded, no account is needed, and the page makes no network requests after it loads. You can verify that yourself: load the page, open your browser's network inspector, or even disconnect from the internet and keep using it.

Free page vs. the €5 download

Here (free): unlimited single files — one at a time, as many as you like, forever. Counted only in your own browser (localStorage): no cookies, no analytics, nothing that identifies you.
The download (€5, once): batch/folder processing, ZIP export, and the tool as a single HTML file that runs offline forever on any computer you own — even with no internet at all. Plus the commercial-use licence. Full details →

Questions people ask

Do the files get uploaded before renaming?

No. The folder picker runs locally and the renaming logic executes inside this page — your files stay on your disk, and the tool works with the network cable unplugged.

Can I preview before renaming?

Yes — every new filename is previewed before anything changes, with undo information written to a log you can download.

What naming patterns are supported?

Prefix/suffix, find & replace, sequence counters with padding, date stamps and case normalization — combined freely.

What's the difference between this free page and the paid download?

The free page handles unlimited small batches (up to about 20 files). The €5 download removes the cap, runs offline forever, and adds saved rename presets.

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All free tools → · Untracked — buy-once software

Untracked builds single-file tools: no installation, no account, no cloud, no subscription — and no tracking on this page either. The only thing stored is your own use count, in your browser.