Bulk Rename Utility lets you set rules separately, select the exact items to be affected, and preview the results in a New Name column. The workflow below focuses on rename extension does not convert without changing unrelated files.
Example: before and after
These filenames are examples to explain the transformation; they are not test results from your files.
| Before | After (illustrative) |
|---|---|
picture.jpg | picture.jpg (still JPEG) |
How to do it step by step
- Step 1. Inspect file content type.
- Step 2. Keep the true extension.
- Step 3. Use dedicated conversion software when needed.
- Step 4. Reopen files after changes.
Why this workflow works
The rule and selection work together: the rule changes eligible filenames, while the selection limits which files receive the change. Always inspect the New Name column and confirm the directory before choosing Rename. For repetitive work, save verified settings as a favourite, but review them again on each new batch.
How to verify the results
Compare the original and proposed filenames side by side, check that each target name is unique in its directory, and confirm file extensions match the actual file types. After applying the rule, open a sample file in its usual Windows application and check any shortcuts or scripts that use the old path.
Frequently asked questions
How do I rename extension does not convert in Bulk Rename Utility?
Changing .jpg to .png in a filename does not transform the actual image data.
What should I check before applying this batch?
Compare the New Name preview for every selected file, check for duplicates and verify extensions. Incorrect extensions can prevent Windows apps from opening files.
Does changing a filename also change its contents?
No. A standard filename rename changes the name or path, not the document, photo, audio, or video data. Changing an extension also does not convert a file format.
Related Windows renaming guides
For release details, licensing and implementation-specific controls, consult the documentation and source list. Always use a small test directory before a large batch.