Is this free browser file-renaming software for Linux, Mac, Windows or Android?

Yes. Use a browser with file selection, Blob streams and downloads on Linux or Ubuntu, macOS, Windows or Android. Choose files, set the rules, check the preview and download renamed.zip. Use is free and requires no account or installation. Availability depends on the browser APIs, especially on older systems.

How do I batch rename files and save the result?

Use Add files or drop files onto the page. Adjust the rules and review the old and new names. Resolve any clashes, then choose Download renamed.zip and extract the renamed copies where you want them. This tool leaves the original files in their current location unchanged.

How do I number files 001, 002, 003?

Choose In front of the name or At the end of the name and type 001 as the start. Those three digits set the minimum width: 001, 002, 003, with 999 followed by 1000. Step sets the increment from 1 to 1,000,000. Joined with selects an underscore, hyphen, space, dot or no separator. Order selects as added, natural filename order, date modified or size.

Can I automatically rename multiple files with one rule?

Yes. A rule applies to all files in the selected batch and the preview updates when you change it. Combine literal find and replace, prefixes, suffixes and numbering. Untick Keep the original name to build names from your prefix, suffix and number. The tool operates on the files you add to this tab.

Can I rename MP3, music, photo, video or movie filenames?

Yes. Add those files and use the same numbering, prefix, suffix or literal find-and-replace rules, then download the renamed copies. The contents stay unchanged. This tool does not read ID3 or EXIF tags, identify titles or episodes, or update a media-library database.

Why is a new name flagged as a clash?

The tool compares NFC-normalized names after Unicode uppercase then lowercase conversion and normalizes the key to NFC again. This conservative check groups Σ.txt with ς.txt and S.txt with ſ.txt, and can flag names your file system would distinguish. It does not model every file system’s comparison rules. Comparison keys do not replace filenames in the preview or ZIP. The ZIP waits until the preview has no clashes: turn on numbering, change the rules or remove a file.

What happens to a slash, a colon or a name like CON?

Slashes, backslashes and colons become hyphens. The characters " | ? * and control or text-direction characters become underscores. Selected invisible characters are removed and trailing dots and spaces are dropped. Windows compatibility names such as CON get an underscore, so CON.txt becomes CON_.txt; the tool also restricts COM0 and LPT0. Names over the tool’s 255-byte UTF-8 limit are shortened, preserving the prefix, suffix, number and an extension of up to 64 bytes including its dot where they fit. Each fix is listed.

Does changing the extension convert a file?

No. Choose Keep as it is, Lower case, Upper case or Change to under extension. When Change to is selected, an empty new extension removes it. These rules change filenames only: a PNG renamed .jpg still contains PNG data. File bytes are stored uncompressed in the ZIP, and the ZIP date uses the last-modified date within its supported date range.

How many files can I rename at once?

One ZIP takes up to 2,000 files totalling 1,073,741,824 bytes, labelled 1 GB in the controls. Sizes are checked before file data is read for the ZIP. Split larger sets into batches and continue numbering from the previous batch. Folders themselves are left out; select files inside them.

Is find and replace case sensitive?

Case must match starts ticked; untick it to ignore case. Find looks only at the name before the final extension and replaces every occurrence. It treats what you type as literal text, so . * ( ) have no pattern meaning. Regex and wildcard patterns are not supported.

Are my files uploaded or remembered?

Files are read and zipped in this tab. Only the naming rules are remembered in this browser, when storage is available; files and the filename list are not saved. Copy list copies a tab-separated preview of old names, new names and notes.

Batch File Renamer

Choose files, apply numbering, find and replace, a prefix or suffix and extension rules, then preview every new name. Download the renamed copies as a ZIP; your originals keep their names and files stay in this tab.

rules

no files yet

findreplaceCase must match

on the name only, never the extension; plain text, not a pattern

prefixsuffixKeep the original namenumberingstartstepjoined with

the digits you type set the width: 001 counts 001, 002, 003

extensionnew extension

changes the name only: a .png renamed .jpg is still a PNG inside

order

originals never touched: the renamed copies go into a ZIP

Add files

preview

empty

Add files to rename

Use Add files, or drop files here. Each new name shows beside the old one before anything is written, and nothing is uploaded.

Files: none

Renamed: none

Clashes: 0

Download: add files first

Files are read and zipped in this tab and never uploaded. Each renamed copy is stored in the ZIP without compression and uses its last-modified date within the ZIP date range; unzip it wherever you want the renamed set.

One ZIP takes at most 2,000 files and 1 GB. Only the rules are remembered in this browser, never your files or the list of names.

Try an example

Small text files written for this page and marked as examples. Trying one replaces the list and the rules.

a.txt and b.txtnumbering from 001, in front, joined with _
001_a.txt and 002_b.txt
Report.PDF and report.pdfextension set to lower case, no numbering
Report.pdf and report.pdf differ only in case: flagged as a clash, and the ZIP waits until they differ
Replace IMG_ with 09/14_, and a file named CON.txta path separator and a reserved Windows name
IMG_0412.JPG becomes 09-14_0412.JPG, CON.txt becomes CON_.txt, and both fixes are listed in the report

Accuracy. This tool cannot rename the files on your disk: only the downloaded copies get new names, and your originals keep theirs. Clashes are checked ignoring case and Unicode form; path separators, Windows compatibility names, control characters, trailing dots and spaces and names over 255 bytes are rewritten and listed before download. File contents are stored in the ZIP byte for byte, uncompressed.

Common questions

Is this free browser file-renaming software for Linux, Mac, Windows or Android?: Yes. Use a browser with file selection, Blob streams and downloads on Linux or Ubuntu, macOS, Windows or Android. Choose files, set the rules, check the preview and download renamed.zip. Use is free and requires no account or installation. Availability depends on the browser APIs, especially on older systems.
How do I batch rename files and save the result?: Use Add files or drop files onto the page. Adjust the rules and review the old and new names. Resolve any clashes, then choose Download renamed.zip and extract the renamed copies where you want them. This tool leaves the original files in their current location unchanged.
How do I number files 001, 002, 003?: Choose In front of the name or At the end of the name and type 001 as the start. Those three digits set the minimum width: 001, 002, 003, with 999 followed by 1000. Step sets the increment from 1 to 1,000,000. Joined with selects an underscore, hyphen, space, dot or no separator. Order selects as added, natural filename order, date modified or size.
Can I automatically rename multiple files with one rule?: Yes. A rule applies to all files in the selected batch and the preview updates when you change it. Combine literal find and replace, prefixes, suffixes and numbering. Untick Keep the original name to build names from your prefix, suffix and number. The tool operates on the files you add to this tab.
Can I rename MP3, music, photo, video or movie filenames?: Yes. Add those files and use the same numbering, prefix, suffix or literal find-and-replace rules, then download the renamed copies. The contents stay unchanged. This tool does not read ID3 or EXIF tags, identify titles or episodes, or update a media-library database.
Why is a new name flagged as a clash?: The tool compares NFC-normalized names after Unicode uppercase then lowercase conversion and normalizes the key to NFC again. This conservative check groups Σ.txt with ς.txt and S.txt with ſ.txt, and can flag names your file system would distinguish. It does not model every file system’s comparison rules. Comparison keys do not replace filenames in the preview or ZIP. The ZIP waits until the preview has no clashes: turn on numbering, change the rules or remove a file.
What happens to a slash, a colon or a name like CON?: Slashes, backslashes and colons become hyphens. The characters < > " | ? * and control or text-direction characters become underscores. Selected invisible characters are removed and trailing dots and spaces are dropped. Windows compatibility names such as CON get an underscore, so CON.txt becomes CON_.txt; the tool also restricts COM0 and LPT0. Names over the tool’s 255-byte UTF-8 limit are shortened, preserving the prefix, suffix, number and an extension of up to 64 bytes including its dot where they fit. Each fix is listed.
Does changing the extension convert a file?: No. Choose Keep as it is, Lower case, Upper case or Change to under extension. When Change to is selected, an empty new extension removes it. These rules change filenames only: a PNG renamed .jpg still contains PNG data. File bytes are stored uncompressed in the ZIP, and the ZIP date uses the last-modified date within its supported date range.
How many files can I rename at once?: One ZIP takes up to 2,000 files totalling 1,073,741,824 bytes, labelled 1 GB in the controls. Sizes are checked before file data is read for the ZIP. Split larger sets into batches and continue numbering from the previous batch. Folders themselves are left out; select files inside them.
Is find and replace case sensitive?: Case must match starts ticked; untick it to ignore case. Find looks only at the name before the final extension and replaces every occurrence. It treats what you type as literal text, so . * ( ) have no pattern meaning. Regex and wildcard patterns are not supported.
Are my files uploaded or remembered?: Files are read and zipped in this tab. Only the naming rules are remembered in this browser, when storage is available; files and the filename list are not saved. Copy list copies a tab-separated preview of old names, new names and notes.

This tool cannot rename the files on your disk: only the downloaded copies get new names, and your originals keep theirs. Clashes are checked ignoring case and Unicode form; path separators, Windows compatibility names, control characters, trailing dots and spaces and names over 255 bytes are rewritten and listed before download. File contents are stored in the ZIP byte for byte, uncompressed.