Bulk File Renamer

What this tool does

Bulk File Renamer applies a rename pattern, prefix, suffix, find-and-replace, sequential numbering and lowercasing, to a batch of selected files, previewing every new name before packaging the renamed copies into a downloadable ZIP, since a web page can’t rename files directly on your disk.

Renaming dozens of files one at a time, consistently applying a prefix, numbering scheme, or find-and-replace pattern by hand, is slow and error-prone, the kind of task a small batch tool handles in seconds.

This renamer lets you select a batch of files and build a rename pattern from prefix, suffix, find-and-replace text, sequential numbering and lowercasing, previewing every resulting new name before downloading the renamed copies, packaged as a ZIP since a browser page can’t rename files directly on your disk.

How to use Bulk File Renamer

1. Select the batch of files you want to rename.
2. Build your pattern: Prefix, Suffix, Find/Replace text, and whether to add sequential numbering.
3. Review the live preview of every original name against its new name.
4. Press Download renamed files as ZIP.

Tips for better results

• Sequential numbering is applied in the order files were selected; reorder your original selection if a specific sequence matters.
• Find and Replace works on the filename only (not the extension), so a pattern targeting part of the name won’t accidentally touch the file type suffix.
• The zero-padded digit count for numbering (e.g. 001 vs 1) is configurable, useful for keeping files sorted correctly in a file browser that sorts names alphabetically.
• Lowercasing applies to both the name and extension if enabled, useful for normalising inconsistent capitalisation across a batch.

Common use cases

• Renaming a batch of photos with a consistent prefix and sequential numbering before archiving them.
• Cleaning up inconsistent filenames (spaces, capitalisation) across many downloaded files at once.
• Adding a project or date prefix to a set of documents before sharing them.
• Replacing a recurring unwanted substring across many filenames in one pass.

Common mistakes to avoid

• Expecting files to be renamed in place on your actual disk; a browser page has no access to directly rename files, the renamed copies are delivered as a downloadable ZIP instead.
• Forgetting that sequential numbering follows selection order, not alphabetical order, if the files weren’t selected in the order you expected.
• Using a Find pattern that matches more than intended, like a common short substring, which can rename parts of the filename you didn’t mean to touch; check the live preview carefully before downloading.