Helphonic

Batch File Renamer

Preview bulk file names with find and replace, numbering and case changes. Download renamed copies in a ZIP without changing originals.

Unlimited Free Usage

Literal, case-sensitive replacement applies before the extension. Changing extensions does not convert content. The ZIP contains copies; originals remain untouched.

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File contents and entered text stay on this device. Only access checks and non-content usage metadata go to Helphonic.

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Current limits

per operation

Files
20
Per file
20 MB
Total size
24 MB
ZIP output
26 MB maximum
Copy name
180 UTF-8 bytes maximum
Empty files
Supported

Limits protect your device memory. Processing speed depends on your device.

Read the security details
Processing limits

Up to 20 files, 20 MB per file and 24 MB combined; empty files supported. ZIP output is capped at 26 MB.
Limit comparison

How to increase limits

Compare the per-operation limits available after registration or with an active paid pass.

Free account

Registered user

Unlimited Free Usage

Files
20
Per file
20 MB
Total size
24 MB
ZIP output
26 MB maximum
Copy name
180 UTF-8 bytes maximum
Empty files
Supported
Create a free account
All access passes

Unlimited operations during active validity, subject to abuse safeguards.

Files
20
Per file
20 MB
Total size
24 MB
ZIP output
26 MB maximum
Copy name
180 UTF-8 bytes maximum
Empty files
Supported
View packages

The same limits may apply to every tier. Check before purchasing. Device safety limits still apply.

Frequently asked questions

Are my files or results uploaded?

No. Files, file names, camera frames, decoded text and checksums stay in your browser. Only access checks and non-content usage metadata go to Helphonic. Processing libraries are served from this site.

Is this tool free?

Unlimited free usage is available initially to guests, registered users and active paid users. Administrators can change allowances later. Current access information appears on this page; file and device safety limits still apply.

Will this change my original files?

No. This tool produces downloadable results or copies in page memory and never deletes or overwrites your original files. Download before leaving; results are not saved to your account.

What are the processing limits?

Up to 20 files, 20 MB per file and 24 MB combined; empty files supported. ZIP output is capped at 26 MB.

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How to use

Batch File Renamer

Learn how to use Batch File Renamer: step-by-step instructions, settings, export options, privacy, limits and troubleshooting.

Step-by-step instructions

  1. Choose the files to copy into a renamed ZIP.
  2. Set literal find and replace, prefix, suffix, numbering, case and extension rules.
  3. Review every old-to-new name. Resolve collisions or choose Add a number.
  4. Export the ZIP and mapping reports, then extract copies to your chosen folder.
Formats and important details

Renaming never writes to, deletes or overwrites the original files. ZIP entries contain the original file bytes under new, flat names. Folder structure is not retained.

Find and replace is case-sensitive and literal, not a regular expression. Case changes apply to the base name; extension handling is separate. Changing an extension does not convert file contents.

Control characters, reserved characters, directional overrides, paths and device names are sanitized. Names are normalized and limited to 180 UTF-8 bytes. Collisions are checked without case sensitivity; reject them or add a number. Review sanitized names before export.

Privacy and downloads

All processing happens on this device. Successful results become available after the normal access confirmation. Keep the page open until processing finishes and save your downloads before leaving.

Processing and privacy

Files and entered content are processed on your device in this browser tab. File contents and results are not uploaded to Helphonic or sent to analytics. The page still contacts Helphonic to load its tools, check access and confirm non-content usage information. Work is not saved to your account; download or copy results before leaving or reloading the page.

If an operation cannot finish

Use a current browser and smaller inputs if the tab runs out of memory. Some tools download a local processing library or model on first use, so an internet connection is needed even though your content stays on the device.

If the tool reports that access or limits changed, review the current policy and run it again. If usage confirmation is uncertain after an interrupted connection, a retry can count as another operation. Download completed work before reloading; this site does not keep a recovery copy.

About this tool

Choose files, preview name changes and export renamed copies. Literal find and replace affects the name before the extension. Add prefixes, suffixes and sequence numbers; preserve or change extensions. A mapping report accompanies the ZIP.

Read the full Batch File Renamer guide (opens in a new tab)