Bulk rename files

Drop your files and build a renaming pattern: add a prefix or suffix, number them in sequence, find and replace part of the name, and change the case. See every new name before you download.

  • Free
  • No sign-up
  • Runs in your browser
bulk-rename-files

100% private — files are read in your browser and never uploaded.

How it works

Drop your files

In the order you want them numbered, if you use numbering.

Build your pattern

Prefix, suffix, sequence numbers, find and replace, case.

Download the renamed copies

One file downloads directly, several come as a ZIP.

Rename a whole batch the same way, at once

Photos from a camera named IMG_0001.jpg through IMG_0347.jpg, scanned pages that need to sort correctly, screenshots from a project that all need the same prefix: renaming dozens of files one at a time is slow and easy to get wrong. This tool builds every new name from one pattern and shows you the full result before anything downloads.

Building the pattern

  • Prefix and suffix: text added before or after the original name, such as turning "beach.jpg" into "vacation-beach.jpg".
  • Sequence numbers: an automatic count, such as 01, 02, 03, with the starting number, the digit count and whether it goes at the start or the end of the name under your control.
  • Find and replace: swap one piece of text for another across every file name, with an option to use a regular expression for more advanced patterns.
  • Case: convert every name to lowercase, uppercase, or capitalize each word.

See it before you commit

Every rule you set updates a live preview list showing the old name struck through and the new name next to it, so you catch a pattern mistake, such as an unwanted extra dash, before downloading dozens of files instead of after.

Duplicate names

A pattern that would give two files the same name, for example find and replace stripping the only part that told two files apart, is flagged clearly, and downloading is blocked until it is fixed, so files never silently overwrite one another.

Getting the files back

One file downloads directly with its new name. Several files come bundled as a single ZIP archive, already renamed inside, ready to unzip wherever you need them. Nothing is uploaded: renaming happens entirely in your browser. For a simpler accent and symbol cleanup without a full pattern, use clean file names.

Frequently asked questions

How do I rename many files at once with numbers?
Drop your files, keep the sequence number option on, and set the starting number and digit count. Every file gets a number in order.
Can I add a prefix to all my files?
Yes. Type it in the prefix field and it is added to the start of every new name.
How does find and replace work?
Type the text to find and what to replace it with. It is applied to every file name, and you can turn on regular expressions for more control.
What order are the files numbered in?
The order you drop or select them in. Select them in the right order in your file manager before dropping them here if order matters.
What happens if my pattern creates duplicate names?
The clash is flagged and the download is disabled until you adjust the pattern, so no file is overwritten by mistake.
Are my files uploaded?
No. Renaming happens entirely in your browser.

Related tools

More utilities that also run without leaving your browser.

Clean file namesRemove accents, spaces and symbols from file names before uploading them. Compare two file listsPaste two lists of file names and see what's missing from each. Create a ZIP filePack any files into a single ZIP archive and download it. Upload limit checkerCheck which files pass a size limit before you try to upload them. File type detectorFind what a file really is by its content, not its extension. Paste text, download a fileTurn any pasted text into a downloadable file, with the name and extension you choose.