Free · No signup · Runs in your browser

Free Bulk File Renamer

Rename a whole batch of files by a pattern — find & replace, change case, add numbers, or build names from tokens like {name}_{w}x{h}. Files are renamed byte-for-byte and never leave your browser. Purpose-built for ad-server naming.

Launch the bulk renamer How it works
100% in your browser — your files are never uploaded.
Why use it

Batch renaming that follows the rules.

Token templates

Build names from tokens — {name}, {n}, {date}, and {w}×{h} dimensions read straight from each image.

Find & replace + regex

Swap text plainly or with a regular expression, change case, fix spaces and symbols, add a prefix, suffix or sequence number.

Clash auto-fix

A live old → new preview shows every rename as you type, and duplicate output names get fixed automatically.

Renamed ZIP out

Download the whole renamed batch as one ZIP — files are renamed byte-for-byte, with no re-encoding and no quality loss.

How it works

Three steps, all in your browser.

1

Add files or a ZIP

Drop in any files — images, HTML5 ad .zips, PDFs, fonts, anything — or a .zip and we'll pull the files out. Nothing is uploaded.

2

Choose your rules

Pick a preset or set your own: template, find & replace, case, separators, prefix/suffix, numbering and extension. The preview updates live.

3

Download the renamed ZIP

Grab the renamed batch as a single ZIP, or copy the old → new map as text. The preview is free; free accounts get 5 ZIP exports a day.

Why ours

Private, precise, ad-ops ready.

Nothing uploaded

Renaming happens entirely on your device, byte-for-byte — safe for client deliverables and confidential creative. No file ever touches a server.

Ad-server-safe names

One-click presets for CM360 / DV360 conventions — lowercase, dashes, stripped unsafe characters, and automatic {w}×{h} dimensions.

The whole batch at once

Name fifty banners to a strict convention in one pass — no hand-renaming, no spreadsheet, no risk of a typo breaking a trafficking sheet.

More free browser tools

Compress, convert, resize and pick colours — all on-device.

Pair the renamer with our other free, in-browser tools: Compress Images, Convert Image, Resize Image and Color Picker.

Launch the renamer
FAQ

Quick answers.

Are my files uploaded to a server?
No. Bulk Rename runs 100% in your browser — your files never leave your device. Each file is renamed byte-for-byte (nothing is re-encoded or re-compressed), so it's completely safe for client work, unreleased creative and confidential assets.
What can I rename files to?
Anything you can describe as a pattern. Build names from a token template like {name}_{w}x{h}_v{nn} (image width & height are auto-detected), find & replace text (plain or regex), change case, normalise spaces and symbols, add a prefix or suffix, add a sequential number, and keep or lowercase the extension. Every change shows in a live old → new preview as you type.
Does it actually rename the files, or just show new names?
It produces the real renamed files. Because a browser can't rename files in place on your disk, you download them back as a single ZIP with the new names applied — renamed byte-for-byte, no quality loss. You can also copy the full old → new rename map as text if you'd rather script it yourself.
Is it built for ad-server naming (CM360 / DV360)?
Yes. Ad servers are fussy about file names, so there are one-click presets for ad-server-safe names — lowercase, dashes, and stripping unsafe characters — plus automatic {w}x{h} dimension tokens pulled straight from each image. Name a whole banner set to a strict convention in one pass.
What file types can I rename?
Any of them — images, packaged HTML5 ad .zips, PDFs, fonts, documents, anything. Drop a folder of files or a .zip and we'll pull the files out. Need a different edit too? Try Compress Images, Convert Image or Color Picker.
Is it free?
Yes — free to use with no signup, running entirely in your browser. The live rename preview is always free, and free accounts get 5 ZIP exports per day. A Premium account unlocks unlimited ZIP exports.

Rename a whole batch — in seconds, free.

Free to use with no signup, and nothing is ever uploaded. Name a full banner set to your ad-server convention in one pass — the live preview is always free, with 5 ZIP exports a day, and Premium unlocks unlimited exports.

Launch the bulk renamer Talk to the studio