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What is the Bulk File Renamer?
The Bulk File Renamer is a client-side utility designed to rename batches of files using flexible patterns, numbering systems, and text replacements. By dropping your files directly into the browser window, you can apply multiple renaming rules simultaneously, previewing the results in real time before committing the changes.
This renamer does not upload your files or data to external servers. Instead, it reads the file metadata, applies your renaming rules, and generates a newly organized ZIP archive for download. This keeps sensitive files, photos, and project assets secure.
How to Use the Bulk File Renamer
- Add Your Files: Drag and drop your files into the upload box or click the file area to browse your local storage. A table displaying the original file names will appear.
- Apply Renaming Rules: Use the sidebar controls to define prefix or suffix text, replace specific words, or append sequential serial numbers to your files.
- Check the Live Preview: Review the "New Name" column in the file table to confirm the names are correct. The preview updates instantly as you adjust rules.
- Download Renamed Assets: Click the "Download Renamed Files" button. The tool will bundle your files under their new names into a single ZIP archive, downloaded directly to your device.
Key Features
- Real-time Preview Table: Visualizes name changes in a table so you can check rules before compiling the ZIP.
- Flexible String Replacement: Swap out words, letters, or spaces in filenames using search-and-replace text fields.
- Sequential Numbering: Automatically append increments (e.g., _01, _02, _03) to group related photos or records.
- Prefix and Suffix Inputs: Append timestamps, project tags, or categories to the beginning or end of filenames.
- Local ZIP Packaging: Bundles renamed files locally using JSZip, protecting your data from cloud leaks.
Common Use Cases
- Photography Batch Organization: Rename camera files like `DSC_4821.jpg` into readable names with date tags and numbers.
- Document and Archival Sorting: Apply standardized numbering structures and client prefixes to PDF files and invoices.
- Web Development Asset Prep: Format image names by converting uppercase letters to lowercase and replacing spaces with hyphens for clean web URLs.
- Audio Sample Management: Standardize file names for music samples, sound effects, or track segments before loading them into a workstation.
Frequently Asked Questions
No. Browsers cannot overwrite files on your hard drive directly. The tool reads your files, duplicates them with the new names, and packages them into a ZIP archive. Your original files remain unchanged in their source directories.
You can process dozens of files at a time. The limit is determined by your system's available RAM. For large folders containing hundreds of megabytes, we recommend renaming files in smaller batches to ensure smooth performance.
No. 99tool.in processes all files locally. No data, file content, or filename parameters are uploaded to external endpoints or saved on our servers.
You can edit the naming rules or clear the file list to start over. However, once you download the ZIP and extract the files, you would need to reload the files into the renamer to change their names again.
The tool reads all dragged files in a flat structure. If you upload a folder containing subfolders, the files are extracted and renamed inside a single output directory in the ZIP file.
🔒 Privacy & Data Note: File renaming and packaging occur locally in your browser. No files, content, or names are sent to our servers.