Bulk File Renamer
Rename batches of files sequentially with dynamic patterns, dates, and zero-padded indices right in your browser.
Organize and Standardize Files in Seconds
Managing large collections of messy filenames from cameras, smartphone exports, or design iterations can be overwhelming. Standard camera naming schemes like IMG_0041.JPG or generic downloads like document(3).pdf lack context and make sorting difficult. OnlyFiles Bulk File Renamer provides a clean, private browser utility to organize, clean up, and systematically reformat files without installing third-party utilities or sharing personal data.
Unlike cloud conversion websites that demand your files be uploaded to an unknown server before renaming, OnlyFiles uses the modern HTML5 File API and memory blobs. The files remain on your physical hard drive or SSD throughout the renaming operation, ensuring total confidentiality for legal agreements, invoices, private photos, and confidential business documents.
100% Client-Side Privacy
No bytes are transferred across the network. Files are read in client memory, given their new virtual file descriptor, and saved directly to your downloads directory.
Dynamic Token Replacement
Combine dynamic variables like sequence index ({n}), original filename ({name}), file extension ({ext}), and current timestamp ({date}) into any custom pattern.
Zero-Padded Numbering
Maintain proper alphabetical and chronological file sorting on Windows, macOS, and Linux by padding sequence digits with leading zeros (e.g., 001, 002, 010).
How to Batch Rename Files Online
1. Select Files: Drag and drop any number of files or choose them via the file dialog.
2. Define Your Pattern: Enter your custom pattern in the pattern box. For example, Project_Report_{date}_{n}{ext} or Vacation_{n}{ext}.
3. Adjust Indexing: Set your starting sequence number (e.g., 1 or 100) and specify how many digits of zero-padding you prefer.
4. Download: Check the live preview table showing the old versus new names. Download files individually or all at once with one click.
Frequently Asked Questions
Are my files uploaded to any external server during renaming?
No. The entire renaming process happens directly inside your web browser using HTML5 File APIs. Your documents, photos, and files never leave your computer.
What naming pattern tags are supported?
You can use {n} for sequential numbers, {name} for original filenames, {ext} for the file extension, and {date} for current ISO date stamps (YYYY-MM-DD).
Is there a limit on how many files I can rename?
No. You can add as many files as your device can handle in a single session. There are no size caps or usage limits.